[PATCH v8 0/2] Add CIX Sky1 USBSSP controller support

[PATCH v8 0/2] Add CIX Sky1 USBSSP controller support

[Hongliang Yang]

This series adds support for the Cadence USBSSP DRD controller
integrated in the CIX Sky1 SoC: the device tree binding and the glue
driver. It is a USB series only. The arm64 device tree nodes belong to
the SoC subsystem, so they are not part of this series and will be sent
separately once the binding is accepted.

Tested on Radxa Orion O6 (Sky1) in host mode, together with the CIX
USB3 PHY series posted separately. The series applies on top of
v7.4-rc1.

Each controller is described as one address range in the USB30 Type-A
DRD RCSU block at 0x091c0000, starting at its AXI cache attribute strap
register and ending after its AXI clock status register. The two Type-A
controllers interleave their strap and status registers in that block:

  0x300  STRAP_PIN0     stream ID           USB4
  0x304  STRAP_PIN1     stream ID           USB5
  0x30c  STRAP_PIN3     clock enables       USB4, USB5
  0x314  STRAP_PIN5     awcache/arcache     USB4
  0x324  STRAP_PIN9     awcache/arcache     USB5
  0x328  STRAP_PIN10    USB2 PLL            USB4
  0x400  STRAP_STATUS0  AXI clock state     USB4
  0x410  STRAP_STATUS4  AXI clock state     USB5

Only STRAP_PIN3 is common to both controllers; every other register is
read or written by one of them. There is no contiguous window that
covers the registers of one controller only, so the two ranges overlap.
The range is mapped with devm_ioremap() instead of
devm_platform_ioremap_resource(): requesting the region would make the
second controller fail with -EBUSY.

Thanks to Krzysztof Kozlowski for the review of the earlier versions.

Changes in v8:
- Fix the example: the USB3 PHY is a single provider shared by both
  controllers, so the core node references one phandle. The example
  still carried the per-lane two-PHY form that v5 of the PHY series
  used. Keep the USB2 PHY reference and describe it as usb-nop-xceiv,
  since it needs no configuration.
- Add the vendor prefix to the two board properties: cix,ssp-disable
  and cix,u3-port-disable.
- Driver: do not assert the resets in system suspend/resume, and do not
  cache the wakeup state; the child device that owns the wakeup
  interrupt is asked instead.
- Driver: rewrite shutdown() to use the same teardown as remove(), and
  allocate the child platform data with kzalloc() so that
  platform_device_release() can free it.
- Driver: only set PS_PME_En when wakeup is requested, and return
  -ETIMEDOUT when the controller does not reach D3 or does not leave
  it.

Changes in v7:
- Describe the RCSU registers of each controller as one address range
  starting at its AXI cache attribute register, instead of two 16-byte
  register slots, and drop the reg-names property.
- Map that range with devm_ioremap(); request_mem_region() cannot be
  used because the two Type-A controllers share the block and their
  ranges overlap.
- Take the offset of the AXI clock status register from per-compatible
  driver data (0xec on Type-A, 0xf0 on Type-C), instead of two
  reg-names.
- Dropped #syscon-cells from the S5 system controller binding: the
  property does not exist in the kernel, and the series no longer
  touches bindings/soc/cix.
- Removed the arm64 dts from the series: it is a separate SoC patchset.

Changes in v6:
- Dropped the simple-bus RCSU container; each node is placed at the
  address of its glue registers and the core is a child at its own
  address.
- Replaced the usbN aliases and the undocumented id property with the
  register offset and bit position arguments of cix,usb-syscon.
- Converted probe error paths to dev_err_probe().
- Removed the unused over-current GPIO handling and the unused dr_base
  and cdnsp_pdev fields.
- Fixed the 125us prescaler value: time * frequency - 1.
- Made the AXI halt writes read-modify-write so the preserved and RW1C
  bits of XEC_AXI_CAP keep their state.

Changes in v5:
- Dropped the cix,sky1-usbss-rcsu syscon binding and the cix,usb-rcsu
  phandle; the glue registers are described in the controller node.
- Added the MAINTAINERS entry for the glue driver.

Changes in v4:
- Split the combined PHY/USBSSP series into two independent series.
- Restructured the RCSU registers as a shared syscon region with offsets
  (reverted in v5).
- Fixed the indentation reported by checkpatch.

Changes in v3:
- Fixed the interrupt specifiers of the core nodes: the Sky1 GICv3 uses
  four cells, so every entry needs the fourth (empty) cell.
- PHY driver: assert the resets before registering the PHY provider,
  disable clocks in LIFO order, and fix the error unroll path so clocks
  that were never enabled are not disabled.

Changes in v2:
- Split the single binding into a PHY binding and a USBSSP binding.
- clock-names: apb/ref for the PHY, sof/axi/lpm/apb for the controller.
- reset-names: core/apb instead of reset/preset.
- Dropped axi_bmax_value from DT; it is a driver constant.
- Added the MAINTAINERS entries.

Changes in v1: initial version.

Hongliang Yang (2):
  dt-bindings: usb: Add CIX Sky1 USBSSP controller
  usb: cdns3: Add CIX Sky1 glue driver

 .../bindings/usb/cix,sky1-usbssp.yaml         | 163 +++++
 MAINTAINERS                                   |   2 +
 drivers/usb/cdns3/Kconfig                     |  13 +
 drivers/usb/cdns3/Makefile                    |   1 +
 drivers/usb/cdns3/cdnsp-sky1.c                | 663 ++++++++++++++++++
 drivers/usb/cdns3/cdnsp-sky1.h                |  99 +++
 6 files changed, 941 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
 create mode 100644 drivers/usb/cdns3/cdnsp-sky1.c
 create mode 100644 drivers/usb/cdns3/cdnsp-sky1.h

--
2.54.0

[PATCH v8 1/2] dt-bindings: usb: Add CIX Sky1 USBSSP controller

[Hongliang Yang]

Add device tree binding for the Cadence USBSSP DRD controller integrated
in the CIX Sky1 SoC. Each instance wraps one of the two USB3 Type-A DRD
controllers of the SoC.

The register range of an instance is its window in the USB30 Type-A DRD
RCSU block at 0x091c0000, from the AXI cache attribute strap register of
the instance up to and including its AXI clock status register. The strap
registers of the two controllers and of their PHYs are interleaved in
that block, so the ranges of the two instances overlap.

The Cadence USBSSP core is described by a child node at its own address.
Mode strap controls are programmed through the Sky1 S5 system controller
referenced by the cix,usb-syscon phandle.

Signed-off-by: Hongliang Yang <hongliang.yang@cixtech.com>
---
Changes in v8:
- Fix the example: the USB3 PHY is a single provider shared by both
  controllers, so the core node references one phandle. The example
  still carried the per-lane two-PHY form that v5 of the PHY series
  used. Keep the USB2 PHY reference and describe it as usb-nop-xceiv,
  since it needs no configuration.
- Add the vendor prefix to the two board properties: cix,ssp-disable
  and cix,u3-port-disable.

Changes in v7:
- Describe the RCSU registers of each controller as one address range
  starting at its AXI cache attribute register, instead of two 16-byte
  register slots, and drop the reg-names property.
- Take the offset of the AXI clock status register from per-compatible
  driver data (0xec on Type-A, 0xf0 on Type-C), instead of two
  reg-names.
- Dropped #syscon-cells from the S5 system controller binding: the
  property does not exist in the kernel, and the series no longer
  touches bindings/soc/cix.
- Removed the arm64 dts from the series: it is a separate SoC patchset.

Changes in v6:
- Dropped the simple-bus RCSU container; each node is placed at the
  address of its glue registers and the core is a child at its own
  address.
- Replaced the usbN aliases and the undocumented id property with the
  register offset and bit position arguments of cix,usb-syscon.
- Converted probe error paths to dev_err_probe().
- Removed the unused over-current GPIO handling and the unused dr_base
  and cdnsp_pdev fields.
- Fixed the 125us prescaler value: time * frequency - 1.
- Made the AXI halt writes read-modify-write so the preserved and RW1C
  bits of XEC_AXI_CAP keep their state.

Changes in v5:
- Dropped the cix,sky1-usbss-rcsu syscon binding and the cix,usb-rcsu
  phandle; the glue registers are described in the controller node.
- Added the MAINTAINERS entry for the glue driver.

Changes in v4:
- Split the combined PHY/USBSSP series into two independent series.
- Restructured the RCSU registers as a shared syscon region with offsets
  (reverted in v5).
- Fixed the indentation reported by checkpatch.

Changes in v3:
- Fixed the interrupt specifiers of the core nodes: the Sky1 GICv3 uses
  four cells, so every entry needs the fourth (empty) cell.

Changes in v2:
- Split the single binding into a PHY binding and a USBSSP binding.
- clock-names: sof/axi/lpm/apb for the controller.
- reset-names: core/apb instead of reset/preset.
- Dropped axi_bmax_value from DT; it is a driver constant.
- Added the MAINTAINERS entries.

Changes in v1: initial version.
---
 .../bindings/usb/cix,sky1-usbssp.yaml         | 163 ++++++++++++++++++
 MAINTAINERS                                   |   1 +
 2 files changed, 164 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml

diff --git a/Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml b/Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
new file mode 100644
index 000000000000..994c805d30da
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
@@ -0,0 +1,163 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/cix,sky1-usbssp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: CIX Sky1 Cadence USBSSP Controller
+
+maintainers:
+  - Hongliang Yang <hongliang.yang@cixtech.com>
+
+description: |
+  The CIX Sky1 USBSSP controller is based on the Cadence USBSSP DRD
+  controller. Each instance wraps one of the two USB3 Type-A DRD
+  controllers of the SoC.
+
+  The register range of an instance is a window in the USB30 Type-A DRD
+  RCSU block at 0x091c0000, starting at the AXI cache attribute strap
+  register of the instance and ending after its AXI clock status
+  register. The strap registers of the two controllers and of their PHYs
+  are interleaved in that block, so the ranges of the two instances
+  overlap.
+
+  The Cadence USBSSP core itself is described by a child node at its own
+  address. Mode strap controls are programmed through the Sky1 S5 system
+  controller referenced by the cix,usb-syscon phandle, whose arguments
+  give the register offset and the bit position of the strap field.
+
+  The USB2 PHY of the controller needs no configuration. It is described
+  as a usb-nop-xceiv device and referenced by the core node like any
+  other PHY.
+
+properties:
+  compatible:
+    const: cix,sky1-usbssp
+
+  reg:
+    maxItems: 1
+    description:
+      Window from the AXI cache attribute strap register of this instance
+      up to and including its AXI clock status register.
+
+  ranges: true
+
+  "#address-cells":
+    const: 2
+
+  "#size-cells":
+    const: 2
+
+  clocks:
+    items:
+      - description: Start-of-frame clock
+      - description: AXI bus clock
+      - description: Low-power mode clock
+      - description: APB register interface clock
+
+  clock-names:
+    items:
+      - const: sof
+      - const: axi
+      - const: lpm
+      - const: apb
+
+  resets:
+    items:
+      - description: APB register reset
+      - description: Controller reset
+
+  reset-names:
+    items:
+      - const: apb
+      - const: core
+
+  cix,ssp-disable:
+    type: boolean
+    description: Disable SuperSpeed Plus mode of the controller.
+
+  cix,u3-port-disable:
+    type: boolean
+    description: The board does not route the USB3 port of the controller.
+
+  cix,usb-syscon:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      Phandle to the Sky1 S5 system controller followed by the register
+      offset and the bit position of the USB mode strap field.
+    items:
+      - items:
+          - description: Phandle to the Sky1 S5 system controller
+          - description: Register offset of the USB mode strap field
+          - description: Bit position of the USB mode strap field
+
+required:
+  - compatible
+  - reg
+  - ranges
+  - "#address-cells"
+  - "#size-cells"
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - cix,usb-syscon
+
+patternProperties:
+  "^usb@[0-9a-f]+$":
+    $ref: cdns,usb3.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/cix,sky1.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/reset/cix,sky1-s5-system-control.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        usb@91c0314 {
+            compatible = "cix,sky1-usbssp";
+            reg = <0x00 0x91c0314 0x00 0x100>;
+            ranges;
+            #address-cells = <2>;
+            #size-cells = <2>;
+
+            clocks = <&scmi_clk CLK_TREE_USB3A_H0_CLK_SOF>,
+                     <&scmi_clk CLK_TREE_USB3A_0_AXI_GATE>,
+                     <&scmi_clk CLK_TREE_USB3A_H0_CLK_LPM>,
+                     <&scmi_clk CLK_TREE_USB3A_0_APB_GATE>;
+            clock-names = "sof", "axi", "lpm", "apb";
+            resets = <&src SKY1_USBC_SS2_PRST_N>,
+                     <&src SKY1_USBC_SS2_RST_N>;
+            reset-names = "apb", "core";
+            cix,usb-syscon = <&src 0x424 8>;
+
+            usb@91d0000 {
+                compatible = "cdns,usb3";
+                reg = <0x00 0x91d0000 0x00 0x4000>,
+                      <0x00 0x91d8000 0x00 0x8000>,
+                      <0x00 0x91d4000 0x00 0x4000>;
+                reg-names = "otg", "xhci", "dev";
+                dr_mode = "otg";
+
+                interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>,
+                             <GIC_SPI 169 IRQ_TYPE_LEVEL_HIGH>,
+                             <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
+                             <GIC_SPI 171 IRQ_TYPE_LEVEL_HIGH>;
+                interrupt-names = "host", "peripheral", "otg", "wakeup";
+                maximum-speed = "super-speed-plus";
+
+                phys = <&usb3_phy4>, <&usb2_phy4>;
+                phy-names = "cdns3,usb3-phy", "cdns3,usb2-phy";
+            };
+        };
+
+        usb2_phy4: usb-phy {
+            compatible = "usb-nop-xceiv";
+            #phy-cells = <0>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 93abbb315065..5144d02fc998 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2903,6 +2903,7 @@ S:	Maintained
 T:	git https://github.com/cixtech/linux-mainline.git
 F:	Documentation/devicetree/bindings/arm/cix.yaml
 F:	Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
+F:	Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
 F:	arch/arm64/boot/dts/cix/
 F:	drivers/mailbox/cix-mailbox.c
 K:	\bcix\b
-- 
2.54.0

[PATCH v8 2/2] usb: cdns3: Add CIX Sky1 glue driver

[Hongliang Yang]

Add a glue layer driver for the Cadence USBSSP controller integrated in
the CIX Sky1 SoC. The driver manages the controller clocks, resets and
the mode strap controls located in the Sky1 S5 system controller, and
writes the AXI cache attributes and polls the AXI clock status of its
own controller in the RCSU block.

The register range is mapped with devm_ioremap() instead of
devm_platform_ioremap_resource(): the two Type-A controllers share one
RCSU block and their register ranges overlap, so reserving the region
would make the second controller fail with -EBUSY. The offset of the
AXI clock status register inside the range is taken from the
per-compatible match data, as it differs between the Type-A and Type-C
register blocks of the SoC.

Signed-off-by: Hongliang Yang <hongliang.yang@cixtech.com>
---
Changes in v8:
- Read the two board properties with their vendor prefix:
  cix,ssp-disable and cix,u3-port-disable.
- Do not assert the resets in system suspend/resume: that discards the
  OTG registers programmed by cdns_drd_init(), and nothing programs
  them again after the child device resumes. Only the clocks are gated.
- Rewrite shutdown() to use the same teardown as remove(): depopulate
  the child while its clocks are still on, then assert the resets and
  disable the clocks. Whether to stay alive is decided on the child
  device, which owns the wakeup interrupt.
- Allocate the child platform data with kzalloc() and free it if the
  children cannot be created: platform_device_release() kfree()s
  dev.platform_data, so it must not be devm-managed.
- Only set PS_PME_En when wakeup is requested, and return -ETIMEDOUT
  when the controller does not reach D3 or does not leave it.
- Drop the cached wakeup state: it went stale as soon as the child
  changed its own wakeup setting.

Changes in v7:
- Map one register range taken from the first reg entry, instead of two
  ranges selected with reg-names.
- Map it with devm_ioremap() because the ranges of the two Type-A
  controllers overlap.
- Take the offset of the AXI clock status register from the match data.

Changes in v6:
- Read the USB mode strap register offset and bit position from the
  cix,usb-syscon phandle arguments instead of relying on the usbN
  aliases and the undocumented id property.
- Use dev_err_probe() in the probe error paths.
- Drop the unused over-current GPIO handling and the unused dr_base and
  cdnsp_pdev fields.
- Do not disable the clocks before they have been acquired.
- Drop the redundant depends on USB_CDNS3 and fix the compatible name
  in the Kconfig help text.
---
 MAINTAINERS                    |   1 +
 drivers/usb/cdns3/Kconfig      |  13 +
 drivers/usb/cdns3/Makefile     |   1 +
 drivers/usb/cdns3/cdnsp-sky1.c | 663 +++++++++++++++++++++++++++++++++
 drivers/usb/cdns3/cdnsp-sky1.h |  99 +++++
 5 files changed, 777 insertions(+)
 create mode 100644 drivers/usb/cdns3/cdnsp-sky1.c
 create mode 100644 drivers/usb/cdns3/cdnsp-sky1.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 5144d02fc998..3c609d371306 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2906,6 +2906,7 @@ F:	Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
 F:	Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
 F:	arch/arm64/boot/dts/cix/
 F:	drivers/mailbox/cix-mailbox.c
+F:	drivers/usb/cdns3/cdnsp-sky1.*
 K:	\bcix\b
 
 ARM/CLKDEV SUPPORT
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
index 39ad23d1ada8..678cedd8de97 100644
--- a/drivers/usb/cdns3/Kconfig
+++ b/drivers/usb/cdns3/Kconfig
@@ -77,6 +77,19 @@ config USB_CDNSP_PCI
 	  If you choose to build this driver as module it will
 	  be dynamically linked and module will be called cdnsp-pci.ko
 
+config USB_CDNSP_SKY1
+	tristate "Cadence USB3 support on CIX Sky1 SoC platforms"
+	depends on ARCH_CIX || COMPILE_TEST
+	default USB_CDNS3
+	help
+	  Glue driver for the Cadence USB dual-role controllers on CIX Sky1
+	  (device tree compatible cix,sky1-usbssp). It enables clocks and
+	  resets from the SoC, then uses the shared cdns3 platform core
+	  (cdns.ko).
+
+	  If built as a module, the module is named cdnsp-sky1.ko and must be
+	  loaded after the cdns core module when both are loadable modules.
+
 config USB_CDNS3_TI
 	tristate "Cadence USB3 support on TI platforms"
 	depends on ARCH_K3 || COMPILE_TEST
diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
index b2e4ba6a49a3..ab813aaf9940 100644
--- a/drivers/usb/cdns3/Makefile
+++ b/drivers/usb/cdns3/Makefile
@@ -28,3 +28,4 @@ obj-$(CONFIG_USB_CDNSP_PCI)			+= cdnsp-pci.o
 obj-$(CONFIG_USB_CDNS3_TI)			+= cdns3-ti.o
 obj-$(CONFIG_USB_CDNS3_IMX)			+= cdns3-imx.o
 obj-$(CONFIG_USB_CDNS3_STARFIVE)		+= cdns3-starfive.o
+obj-$(CONFIG_USB_CDNSP_SKY1)			+= cdnsp-sky1.o
diff --git a/drivers/usb/cdns3/cdnsp-sky1.c b/drivers/usb/cdns3/cdnsp-sky1.c
new file mode 100644
index 000000000000..c5d0ff9141cc
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-sky1.c
@@ -0,0 +1,663 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cdnsp-sky1.c - CIX Sky1 glue for Cadence USBSSP DRD controller
+ *
+ * Copyright (C) 2026 CIX Technology Group Co., Ltd.
+ */
+
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "cdnsp-sky1.h"
+#include "core.h"
+
+static const char *cix_usb_clk_names[CIX_USB_CLK_NUM] = {
+	"sof",
+	"axi",
+	"lpm",
+	"apb",
+};
+
+static int cdnsp_sky1_set_mode(struct device *dev, int mode)
+{
+	struct cdnsp_sky1 *data = dev_get_drvdata(dev);
+
+	return regmap_update_bits(data->usb_syscon, data->strap_offset,
+				  GENMASK(data->strap_bit + 1, data->strap_bit),
+				  mode << data->strap_bit);
+}
+
+/**
+ * cdnsp_sky1_clk_enable_all() - enable all clocks for usb controller
+ * @dev:	Pointer to the device of platform_device
+ *
+ */
+
+static int cdnsp_sky1_clk_enable_all(struct device *dev)
+{
+	int i, ret = 0;
+	struct cdnsp_sky1 *data = dev_get_drvdata(dev);
+	struct clk **cix_usb_clks = data->cix_usb_clks;
+
+	for (i = 0; i < CIX_USB_CLK_NUM; i++) {
+		cix_usb_clks[i] = devm_clk_get(dev, cix_usb_clk_names[i]);
+		if (IS_ERR(cix_usb_clks[i])) {
+			ret = dev_err_probe(dev, PTR_ERR(cix_usb_clks[i]),
+					    "could not get %s clock\n",
+					    cix_usb_clk_names[i]);
+			goto err_usb_clks;
+		}
+		ret = clk_prepare_enable(cix_usb_clks[i]);
+		if (ret) {
+			dev_err(dev, "%s enable failed:%d\n", cix_usb_clk_names[i], ret);
+			goto err_usb_clks;
+		}
+	}
+	dev_dbg(dev, "enable sky1 USB clock done\n");
+	return ret;
+
+err_usb_clks:
+	while (--i >= 0)
+		clk_disable_unprepare(cix_usb_clks[i]);
+	return ret;
+};
+
+/**
+ * cdnsp_sky1_clk_disable_all() - disable all clocks for usb controller
+ * @dev:	Pointer to the device of platform_device
+ *
+ */
+
+static void cdnsp_sky1_clk_disable_all(struct device *dev)
+{
+	int i;
+	struct cdnsp_sky1 *data = dev_get_drvdata(dev);
+	struct clk **cix_usb_clks = data->cix_usb_clks;
+
+	for (i = 0; i < CIX_USB_CLK_NUM; i++)
+		clk_disable_unprepare(cix_usb_clks[i]);
+};
+
+/**
+ * cdnsp_sky1_clk_enable_resume() - enable the clocks that are turned
+ * off while suspend
+ * @dev:	Pointer to the device of platform_device
+ *
+ */
+
+static int cdnsp_sky1_clk_enable_resume(struct device *dev)
+{
+	int i, ret;
+	struct cdnsp_sky1 *data = dev_get_drvdata(dev);
+	struct clk **cix_usb_clks = data->cix_usb_clks;
+
+	for (i = 0; i < CIX_USB_CLK_OFF_NUM; i++) {
+		ret = clk_prepare_enable(cix_usb_clks[i]);
+		if (ret) {
+			dev_err(dev, "failed to enable clock %s: %d\n",
+				cix_usb_clk_names[i], ret);
+			goto err_usb_clks;
+		}
+	}
+	return 0;
+
+err_usb_clks:
+	while (--i >= 0)
+		clk_disable_unprepare(cix_usb_clks[i]);
+	return ret;
+};
+
+/**
+ * cdnsp_sky1_clk_disable_suspend() - disable the clocks which are not
+ * needed when suspend
+ * @dev:	Pointer to the device of platform_device
+ *
+ */
+
+static void cdnsp_sky1_clk_disable_suspend(struct device *dev)
+{
+	int i;
+	struct cdnsp_sky1 *data = dev_get_drvdata(dev);
+	struct clk **cix_usb_clks = data->cix_usb_clks;
+
+	for (i = 0; i < CIX_USB_CLK_OFF_NUM; i++)
+		clk_disable_unprepare(cix_usb_clks[i]);
+};
+
+static u32 sky1_rcsu_read_status(struct cdnsp_sky1 *data)
+{
+	return readl(data->rcsu_base + data->rcsu_status_offset);
+}
+
+static int sky1_rcsu_handshake(struct cdnsp_sky1 *data, u32 mask, u32 done,
+			       u64 timeout_us)
+{
+	u32	result;
+	int	ret;
+
+	ret = readl_poll_timeout(data->rcsu_base + data->rcsu_status_offset,
+				 result,
+				 (result & mask) == done ||
+				 result == U32_MAX,
+				 10, timeout_us);
+	if (result == U32_MAX)		/* card removed */
+		return -ENODEV;
+	return ret;
+}
+
+static int cdns_sky1_platform_suspend(struct device *dev,
+				      bool suspend, bool wakeup)
+{
+	struct cdns *cdns = dev_get_drvdata(dev);
+	struct platform_device *xhci_dev = cdns->host_dev;
+	struct usb_hcd  *hcd;
+	struct device *parent = cdns->dev->parent;
+	struct cdnsp_sky1 *data = dev_get_drvdata(parent);
+	u32 value;
+	int poll;
+	int ret = 0;
+	int count = 3;
+
+	if (cdns->role != USB_ROLE_HOST)
+		return 0;
+
+	if (!xhci_dev) {
+		dev_dbg(dev, "host controller has not been registered\n");
+		return 0;
+	}
+
+	hcd = dev_get_drvdata(&xhci_dev->dev);
+	if (!hcd) {
+		dev_dbg(dev, "host controller have not registered\n");
+		return 0;
+	}
+
+	if (suspend) {
+		while (count--) {
+			value = readl(hcd->regs + XECP_PM_PMCSR);
+			value &= ~PS_MASK;
+			value |= PS_D3;
+			if (wakeup)
+				value |= PS_PME_En;
+			writel(value, hcd->regs + XECP_PM_PMCSR);
+			/* After controller enters D3, disable AXI and SOF
+			 * until AXI valid flag changes to 0.
+			 */
+			if (sky1_rcsu_handshake(data, AXI_CLOCK_VALID, 0,
+						100ULL * 1000)) {
+				u32 ctst;
+
+				ctst = sky1_rcsu_read_status(data);
+				dev_dbg(dev, "enter D3 failed, register value:%x\n",
+					ctst);
+			} else {
+				break;
+			}
+		}
+		if (count < 0) {
+			u32 ctst;
+
+			ctst = sky1_rcsu_read_status(data);
+			dev_err(dev, "enter D3 failed after retries, register value:%x\n",
+				ctst);
+			ret = -ETIMEDOUT;
+		}
+	} else {
+		while (count--) {
+			value = readl(hcd->regs + XECP_PM_PMCSR);
+			value &= ~PS_MASK;
+			value |= PS_D0;
+			value &= ~PS_PME_En;
+			writel(value, hcd->regs + XECP_PM_PMCSR);
+			/* Wait power state back to D0 */
+			poll = readl_poll_timeout(hcd->regs + XECP_PM_PMCSR,
+						  value,
+						  (value & PS_MASK) == 0,
+						  10, 100ULL * 1000);
+			if (poll) {
+				dev_dbg(dev, "exit D3 timeout, power state=0x%lx\n",
+					value & PS_MASK);
+			} else {
+				break;
+			}
+		}
+		if (count < 0) {
+			dev_err(dev, "exit D3 timeout after retries, power state=0x%lx\n",
+				value & PS_MASK);
+			ret = -ETIMEDOUT;
+		}
+	}
+
+	return ret;
+}
+
+static void cdnsp_sky1_configure_controller(struct cdnsp_sky1 *data)
+{
+	int clk;
+	int v0, v1, v2, v3;
+	u32 dev_cap, xhci_cap;
+	u32 val = 0;
+
+	if (data->u3_disable) {
+		dev_dbg(data->dev, "disable u3 port\n");
+		writel(D_XEC_CFG_3XPORT_MODE_VALUE, data->device_base
+			+ D_XEC_CFG_3XPORT_MODE);
+	}
+	dev_cap = readl(data->device_base + D_XEC_AXI_CAP);
+	xhci_cap = readl(data->xhci_base + D_XEC_AXI_CAP);
+	writel(dev_cap | AXI_HALT, data->device_base + D_XEC_AXI_CAP);
+	writel(xhci_cap | AXI_HALT, data->xhci_base + D_XEC_AXI_CAP);
+	writel(data->axi_bmax_value, data->device_base + D_XEC_AXI_CTRL0);
+	writel(data->axi_bmax_value, data->xhci_base + D_XEC_AXI_CTRL0);
+	writel(dev_cap & ~AXI_HALT, data->device_base + D_XEC_AXI_CAP);
+	writel(xhci_cap & ~AXI_HALT, data->xhci_base + D_XEC_AXI_CAP);
+	clk = data->sof_clk_freq;
+	v0 =  25 * clk / 100000000;
+	v1 = clk / 10000;
+	v2 = clk / 10;
+	v3 = 125 * clk / 1000000;
+	writel(((v0 > 1) ? v0 - 1 : 1), data->device_base
+		+ D_XEC_PRE_REG_250NS);
+	writel((unsigned int)((v1 / 100 > 1) > 0 ? (v1 / 100) - 1 : 1),
+	       data->device_base + D_XEC_PRE_REG_1US);
+	writel((unsigned int)((v1 / 10 > 1) > 0 ? (v1 / 10) - 1 : 1),
+	       data->device_base + D_XEC_PRE_REG_10US);
+	writel(((v1) > 1 ? v1 - 1 : 1), data->device_base
+		+ D_XEC_PRE_REG_100US);
+	writel((unsigned int)(v3 > 1 ? v3 - 1 : 1),
+	       data->device_base + D_XEC_PRE_REG_125US);
+	writel(((v2 / 100 > 1) ? (v2 / 100) - 1 : 1), data->device_base
+		+ D_XEC_PRE_REG_1MS);
+	writel(((v2 / 10 > 1) ? (v2 / 10) - 1 : 1), data->device_base
+		+ D_XEC_PRE_REG_10MS);
+	writel((v2 > 1 ? v2 - 1 : 1), data->device_base
+		+ D_XEC_PRE_REG_100MS);
+	dev_dbg(data->dev, "readl:%x, %x ,%x, %x, %x, %x, %x, %x\n",
+		readl(data->device_base + D_XEC_PRE_REG_250NS),
+		readl(data->device_base + D_XEC_PRE_REG_1US),
+		readl(data->device_base + D_XEC_PRE_REG_10US),
+		readl(data->device_base + D_XEC_PRE_REG_100US),
+		readl(data->device_base + D_XEC_PRE_REG_125US),
+		readl(data->device_base + D_XEC_PRE_REG_1MS),
+		readl(data->device_base + D_XEC_PRE_REG_10MS),
+		readl(data->device_base + D_XEC_PRE_REG_100MS));
+	clk = data->lpm_clk_freq;
+	v0 =  25 * clk / 100000000;
+	v1 = clk / 10000;
+	v2 = clk / 10;
+	v3 = 125 * clk / 1000000;
+	writel(((v0 > 1) ? v0 - 1 : 1), data->device_base
+		+ D_XEC_LPM_PRE_REG_250NS);
+	writel((unsigned int)((v1 / 100 > 1) > 0 ? (v1 / 100) - 1 : 1), data->device_base
+		+ D_XEC_LPM_PRE_REG_1US);
+	writel((unsigned int)((v1 / 10 > 1) > 0 ? (v1 / 10) - 1 : 1), data->device_base
+		+ D_XEC_LPM_PRE_REG_10US);
+	writel(((v1) > 1 ? v1 - 1 : 1), data->device_base
+		+ D_XEC_LPM_PRE_REG_100US);
+	writel((unsigned int)(v3 > 1 ? v3 - 1 : 1),
+	       data->device_base + D_XEC_LPM_PRE_REG_125US);
+	writel(((v2 / 100 > 1) ? (v2 / 100) - 1 : 1), data->device_base
+		+ D_XEC_LPM_PRE_REG_1MS);
+	writel(((v2 / 10 > 1) ? (v2 / 10) - 1 : 1), data->device_base
+		+ D_XEC_LPM_PRE_REG_10MS);
+	writel((v2 > 1 ? v2 - 1 : 1), data->device_base
+		+ D_XEC_LPM_PRE_REG_100MS);
+	v0 = readl(data->xhci_base + XEC_USBSSP_CHICKEN_BITS_3);
+	v0 &= ~(CFG_APB_TIMEOUT_PSLVERR_EN | CFG_APB_PSLVERR_EN);
+	writel(v0, data->xhci_base + XEC_USBSSP_CHICKEN_BITS_3);
+	if (data->u3_disable) {
+		dev_dbg(data->dev, "disable u3 port\n");
+		writel(XEC_CFG_3XPORT_MODE_VALUE, data->xhci_base
+			+ XEC_CFG_3XPORT_MODE);
+	} else if (data->ssp_disable) {
+		dev_dbg(data->dev, "disable ssp\n");
+		v0 = readl(data->xhci_base + XEC_CFG_3XPORT_MODE);
+		writel(v0  & CFG_3XPORT_MODE_DIS_SSP, data->xhci_base
+			+ XEC_CFG_3XPORT_MODE);
+	}
+	clk = data->sof_clk_freq;
+	v0 =  25 * clk / 100000000;
+	v1 = clk / 10000;
+	v2 = clk / 10;
+	v3 = 125 * clk / 1000000;
+	writel(((v0 > 1) ? v0 - 1 : 0), data->xhci_base
+		+ XEC_PRE_REG_250NS);
+	writel((unsigned int)((v1 / 100 > 1) > 0 ? (v1 / 100) - 1 : 0), data->xhci_base
+		+ XEC_PRE_REG_1US);
+	writel((unsigned int)((v1 / 10 > 1) > 0 ? (v1 / 10) - 1 : 0), data->xhci_base
+		+ XEC_PRE_REG_10US);
+	writel(((v1) > 1 ? v1 - 1 : 0), data->xhci_base
+		+ XEC_PRE_REG_100US);
+	writel((unsigned int)(v3 > 1 ? v3 - 1 : 0),
+	       data->xhci_base + XEC_PRE_REG_125US);
+	writel(((v2 / 100 > 1) ? (v2 / 100) - 1 : 0), data->xhci_base
+		+ XEC_PRE_REG_1MS);
+	writel(((v2 / 10 > 1) ? (v2 / 10) - 1 : 0), data->xhci_base
+		+ XEC_PRE_REG_10MS);
+	writel((v2 > 1 ? v2 - 1 : 0), data->xhci_base
+		+ XEC_PRE_REG_100MS);
+	clk = data->lpm_clk_freq;
+	v0 =  25 * clk / 100000000;
+	v1 = clk / 10000;
+	v2 = clk / 10;
+	v3 = 125 * clk / 1000000;
+	writel(((v0 > 1) ? v0 - 1 : 0), data->xhci_base
+		+ XEC_LPM_PRE_REG_250NS);
+	writel((unsigned int)((v1 / 100 > 1) > 0 ? (v1 / 100) - 1 : 0), data->xhci_base
+		+ XEC_LPM_PRE_REG_1US);
+	writel((unsigned int)((v1 / 10 > 1) > 0 ? (v1 / 10) - 1 : 0), data->xhci_base
+		+ XEC_LPM_PRE_REG_10US);
+	writel(((v1) > 1 ? v1 - 1 : 0), data->xhci_base
+		+ XEC_LPM_PRE_REG_100US);
+	writel((unsigned int)(v3 > 1 ? v3 - 1 : 0),
+	       data->xhci_base + XEC_LPM_PRE_REG_125US);
+	writel(((v2 / 100 > 1) ? (v2 / 100) - 1 : 0), data->xhci_base
+		+ XEC_LPM_PRE_REG_1MS);
+	writel(((v2 / 10 > 1) ? (v2 / 10) - 1 : 0), data->xhci_base
+		+ XEC_LPM_PRE_REG_10MS);
+	writel((v2 > 1 ? v2 - 1 : 0), data->xhci_base
+		+ XEC_LPM_PRE_REG_100MS);
+	val = readl(data->xhci_base + XEC_USBSSP_CLK_GATING_CTRL);
+	val |= HOST20_ACLK_GATING_DISABLE | HOST20_UTMI_GATING_DISABLE;
+	writel(val, data->xhci_base + XEC_USBSSP_CLK_GATING_CTRL);
+}
+
+static int cdnsp_sky1_drd_init(struct cdnsp_sky1 *data)
+{
+	int ret = 0;
+
+	reset_control_assert(data->reset);
+	reset_control_assert(data->preset);
+	ret = cdnsp_sky1_clk_enable_all(data->dev);
+	if (ret)
+		return ret;
+	writel(CIX_USB_AXI_WR_CACHE_VALUE, data->rcsu_base);
+	cdnsp_sky1_set_mode(data->dev, MODE_STRAP_OTG);
+	reset_control_deassert(data->preset);
+	cdnsp_sky1_configure_controller(data);
+	reset_control_deassert(data->reset);
+	return ret;
+}
+
+static void __iomem *sky1_of_get_addr_by_name(struct device_node *parent, const char *name)
+{
+	void __iomem *addr = NULL;
+	struct device_node *node;
+	int index;
+
+	for_each_child_of_node(parent, node) {
+		index = of_property_match_string(node, "reg-names", name);
+		if (index >= 0) {
+			addr = of_iomap(node, index);
+			of_node_put(node);
+			break;
+		}
+	}
+
+	return addr;
+}
+
+static void __iomem *sky1_get_addr_by_name(struct device *dev, const char *name)
+{
+	return sky1_of_get_addr_by_name(dev->of_node, name);
+}
+
+static void sky1_put_addr(void __iomem *regs)
+{
+	if (regs)
+		iounmap(regs);
+}
+
+struct sky1_usbssp_cfg {
+	unsigned int rcsu_status_offset;
+};
+
+/* Offset of STRAP_STATUS0, the AXI clock status register, from 0x91c0314. */
+static const struct sky1_usbssp_cfg sky1_usbssp_typea_cfg = {
+	.rcsu_status_offset = 0xec,
+};
+
+static int cdnsp_sky1_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct of_dev_auxdata cdns_sky1_auxdata[] = {
+		{ .compatible = "cdns,usb3", },
+		{},
+	};
+	const struct sky1_usbssp_cfg *cfg;
+	struct cdnsp_sky1 *data;
+	struct cdns3_platform_data *cdns_sky1_pdata;
+	struct resource *res;
+	unsigned int args[2];
+	int ret = 0;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	cfg = of_device_get_match_data(dev);
+	if (!cfg)
+		return dev_err_probe(dev, -ENODEV, "unsupported device\n");
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return dev_err_probe(dev, -ENODEV, "missing register range\n");
+	/*
+	 * The two Type-A controllers share one RCSU block and their
+	 * register ranges overlap, so the range is mapped without
+	 * requesting it: request_mem_region() would make the second
+	 * controller fail with -EBUSY.
+	 */
+	data->rcsu_base = devm_ioremap(dev, res->start, resource_size(res));
+	if (!data->rcsu_base)
+		return dev_err_probe(dev, -ENOMEM, "failed to map registers\n");
+	data->rcsu_status_offset = cfg->rcsu_status_offset;
+	data->reset = devm_reset_control_get_exclusive(&pdev->dev, "core");
+	if (IS_ERR(data->reset))
+		return dev_err_probe(dev, PTR_ERR(data->reset),
+				     "failed to get core reset\n");
+	data->preset = devm_reset_control_get_exclusive(&pdev->dev, "apb");
+	if (IS_ERR(data->preset))
+		return dev_err_probe(dev, PTR_ERR(data->preset),
+				     "failed to get APB reset\n");
+	platform_set_drvdata(pdev, data);
+	data->dev = dev;
+	data->usb_syscon =
+		syscon_regmap_lookup_by_phandle_args(node, "cix,usb-syscon",
+						     2, args);
+	if (IS_ERR(data->usb_syscon))
+		return dev_err_probe(dev, PTR_ERR(data->usb_syscon),
+				     "failed to get S5 system controller\n");
+	data->strap_offset = args[0];
+	data->strap_bit = args[1];
+	data->u3_disable = device_property_read_bool(dev, "cix,u3-port-disable");
+	data->ssp_disable = device_property_read_bool(dev, "cix,ssp-disable");
+	data->sof_clk_freq = CIX_USB_CLK_8M;
+	data->lpm_clk_freq = CIX_USB_CLK_32K;
+	data->axi_bmax_value = AXI_BMAX_VALUE_DEFAULT;
+	data->xhci_base = sky1_get_addr_by_name(dev, "xhci");
+	if (!data->xhci_base) {
+		ret = -ENODEV;
+		goto err_put_xhci;
+	}
+	data->device_base = sky1_get_addr_by_name(dev, "dev");
+	if (!data->device_base) {
+		ret = -ENODEV;
+		goto err_put_addrs;
+	}
+	ret = cdnsp_sky1_drd_init(data);
+	if (ret == -ETIMEDOUT)
+		ret = -EPROBE_DEFER;
+	if (ret) {
+		/*
+		 * drd_init() leaves the clocks disabled and the resets
+		 * asserted on failure; only the address mappings are
+		 * left to release.
+		 */
+		goto err_put_addrs;
+	}
+	/*
+	 * platform_device_release() kfree()s dev.platform_data, so this
+	 * buffer belongs to the child device once it is created. It cannot
+	 * be devm-managed, and it is released here only if no child takes
+	 * it over.
+	 */
+	cdns_sky1_pdata = kzalloc(sizeof(*cdns_sky1_pdata), GFP_KERNEL);
+	if (!cdns_sky1_pdata) {
+		ret = -ENOMEM;
+		goto err_quiesce;
+	}
+	cdns_sky1_pdata->platform_suspend = cdns_sky1_platform_suspend;
+	cdns_sky1_pdata->quirks = CDNS3_DEFAULT_PM_RUNTIME_ALLOW;
+	cdns_sky1_auxdata[0].platform_data = cdns_sky1_pdata;
+	ret = of_platform_populate(node, NULL, cdns_sky1_auxdata, dev);
+	if (ret) {
+		dev_err(dev, "failed to create children: %d\n", ret);
+		kfree(cdns_sky1_pdata);
+		goto err_quiesce;
+	}
+	device_set_wakeup_capable(dev, true);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	return 0;
+
+err_quiesce:
+	reset_control_assert(data->reset);
+	reset_control_assert(data->preset);
+	cdnsp_sky1_clk_disable_all(dev);
+err_put_addrs:
+	sky1_put_addr(data->device_base);
+err_put_xhci:
+	sky1_put_addr(data->xhci_base);
+	return ret;
+}
+
+static void cdnsp_sky1_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cdnsp_sky1 *data = dev_get_drvdata(dev);
+
+	pm_runtime_get_sync(dev);
+	of_platform_depopulate(dev);
+	sky1_put_addr(data->xhci_base);
+	sky1_put_addr(data->device_base);
+	reset_control_assert(data->reset);
+	reset_control_assert(data->preset);
+	cdnsp_sky1_clk_disable_all(dev);
+	pm_runtime_disable(dev);
+	pm_runtime_set_suspended(dev);
+	pm_runtime_put_noidle(dev);
+}
+
+/*
+ * Because the wake-up interrupt and host interrupt are the same interrupt,
+ * closing the axi and sof clock will result in the inability to generate
+ * port status change interrupt.
+ *
+ * The resets are left alone here. Asserting them throws away the OTG
+ * registers programmed by cdns_drd_init(), and nothing programs them again
+ * after the child device resumes, so the controller keeps its state across
+ * system suspend and only the clocks are gated.
+ */
+static int cdnsp_sky1_system_suspend(struct device *dev)
+{
+	cdnsp_sky1_clk_disable_suspend(dev);
+
+	return 0;
+}
+
+static int cdnsp_sky1_system_resume(struct device *dev)
+{
+	return cdnsp_sky1_clk_enable_resume(dev);
+}
+
+static const struct dev_pm_ops cdnsp_sky1_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(cdnsp_sky1_system_suspend, cdnsp_sky1_system_resume)
+};
+
+static const struct of_device_id cdns_sky1_of_match[] = {
+	{
+		.compatible = "cix,sky1-usbssp",
+		.data = &sky1_usbssp_typea_cfg,
+	},
+	{}
+};
+MODULE_DEVICE_TABLE(of, cdns_sky1_of_match);
+
+static int cdnsp_sky1_find_cdns_dev(struct device *dev, void *data)
+{
+	struct device **cdns_dev = data;
+
+	if (dev->of_node && of_device_is_compatible(dev->of_node, "cdns,usb3")) {
+		/* keep a reference: the pointer is used after the iteration */
+		*cdns_dev = get_device(dev);
+		return 1;
+	}
+	return 0;
+}
+
+static void cdnsp_sky1_shutdown(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cdnsp_sky1 *data = dev_get_drvdata(dev);
+	struct device *cdns_dev = NULL;
+
+	/*
+	 * The wakeup interrupt and the host interrupt are the same one, so
+	 * the controller has to stay alive when wakeup is enabled on the
+	 * child device, which is the one that owns the interrupt.
+	 */
+	device_for_each_child(dev, &cdns_dev, cdnsp_sky1_find_cdns_dev);
+	if (cdns_dev && device_may_wakeup(cdns_dev)) {
+		put_device(cdns_dev);
+		return;
+	}
+
+	/*
+	 * Same teardown as remove(): depopulate the child while its clocks
+	 * are still on, so that its driver stops the controller and frees
+	 * the interrupts before the resets and the clocks are taken away.
+	 */
+	pm_runtime_get_sync(dev);
+	of_platform_depopulate(dev);
+	reset_control_assert(data->reset);
+	reset_control_assert(data->preset);
+	cdnsp_sky1_clk_disable_all(dev);
+	pm_runtime_put_noidle(dev);
+	put_device(cdns_dev);
+}
+
+static struct platform_driver cdnsp_sky1_driver = {
+	.probe		= cdnsp_sky1_probe,
+	.remove		= cdnsp_sky1_remove,
+	.shutdown	= cdnsp_sky1_shutdown,
+	.driver		= {
+		.name	= "cdnsp-sky1",
+		.of_match_table	= cdns_sky1_of_match,
+		.pm	= pm_sleep_ptr(&cdnsp_sky1_pm_ops),
+	},
+};
+
+module_platform_driver(cdnsp_sky1_driver);
+
+MODULE_ALIAS("platform:cdnsp-sky1");
+MODULE_DESCRIPTION("CIX Sky1 Cadence USBSSP DRD glue driver");
+MODULE_AUTHOR("Hongliang Yang <hongliang.yang@cixtech.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/cdns3/cdnsp-sky1.h b/drivers/usb/cdns3/cdnsp-sky1.h
new file mode 100644
index 000000000000..73e0dfe318c2
--- /dev/null
+++ b/drivers/usb/cdns3/cdnsp-sky1.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _CDNSP_SKY1_H
+#define _CDNSP_SKY1_H
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/types.h>
+
+#define MODE_STRAP_OTG                  0
+
+#define AXI_HALT                        BIT(31)
+#define AXI_BMAX_VALUE_DEFAULT          0x7
+
+#define D_XEC_CFG_3XPORT_MODE           0x2040
+#define D_XEC_AXI_CAP                   0x2174
+#define D_XEC_AXI_CTRL0                 0x217C
+#define D_XEC_PRE_REG_250NS             0x21E8
+#define D_XEC_PRE_REG_1US               0x21EC
+#define D_XEC_PRE_REG_10US              0x21F0
+#define D_XEC_PRE_REG_100US             0x21F4
+#define D_XEC_PRE_REG_125US             0x21F8
+#define D_XEC_PRE_REG_1MS               0x21FC
+#define D_XEC_PRE_REG_10MS              0x2200
+#define D_XEC_PRE_REG_100MS             0x2204
+#define D_XEC_LPM_PRE_REG_250NS         0x2208
+#define D_XEC_LPM_PRE_REG_1US           0x220C
+#define D_XEC_LPM_PRE_REG_10US          0x2210
+#define D_XEC_LPM_PRE_REG_100US         0x2214
+#define D_XEC_LPM_PRE_REG_125US         0x2218
+#define D_XEC_LPM_PRE_REG_1MS           0x221C
+#define D_XEC_LPM_PRE_REG_10MS          0x2220
+#define D_XEC_LPM_PRE_REG_100MS         0x2224
+
+#define XEC_CFG_3XPORT_MODE             0x2040
+#define XEC_PRE_REG_250NS               0x21E8
+#define XEC_PRE_REG_1US                 0x21EC
+#define XEC_PRE_REG_10US                0x21F0
+#define XEC_PRE_REG_100US               0x21F4
+#define XEC_PRE_REG_125US               0x21F8
+#define XEC_PRE_REG_1MS                 0x21FC
+#define XEC_PRE_REG_10MS                0x2200
+#define XEC_PRE_REG_100MS               0x2204
+#define XEC_LPM_PRE_REG_250NS           0x2208
+#define XEC_LPM_PRE_REG_1US             0x220C
+#define XEC_LPM_PRE_REG_10US            0x2210
+#define XEC_LPM_PRE_REG_100US           0x2214
+#define XEC_LPM_PRE_REG_125US           0x2218
+#define XEC_LPM_PRE_REG_1MS             0x221C
+#define XEC_LPM_PRE_REG_10MS            0x2220
+#define XEC_LPM_PRE_REG_100MS           0x2224
+#define XEC_USBSSP_CHICKEN_BITS_3       0x2230
+#define XEC_USBSSP_CLK_GATING_CTRL      0x2234
+#define XECP_PM_PMCSR                   0x2240
+
+/* XEC_USBSSP_CLK_GATING_CTRL */
+#define HOST20_ACLK_GATING_DISABLE      BIT(4)
+#define HOST20_UTMI_GATING_DISABLE      BIT(5)
+
+/* XECP_PM_PMCSR */
+#define PS_MASK                         GENMASK(1, 0)
+#define PS_D0                           0
+#define PS_D3                           3
+#define PS_PME_En                       BIT(8)
+
+#define D_XEC_CFG_3XPORT_MODE_VALUE     0xa0031e07
+#define XEC_CFG_3XPORT_MODE_VALUE       0xa0031e07
+#define CFG_3XPORT_MODE_DIS_SSP         (~BIT(31))
+
+#define CFG_APB_TIMEOUT_PSLVERR_EN      BIT(22)
+#define CFG_APB_PSLVERR_EN              BIT(23)
+
+#define CIX_USB_CLK_NUM                 (4)
+#define CIX_USB_CLK_OFF_NUM             (2)
+#define CIX_USB_AXI_WR_CACHE_VALUE      0x33
+#define CIX_USB_CLK_32K                 32000
+#define CIX_USB_CLK_8M                  8000000
+
+#define AXI_CLOCK_VALID                 BIT(1)
+
+struct cdnsp_sky1 {
+	struct device *dev;
+	void __iomem *rcsu_base;
+	unsigned int rcsu_status_offset;
+	void __iomem *xhci_base;
+	void __iomem *device_base;
+	struct reset_control *reset;
+	struct reset_control *preset;
+	struct clk *cix_usb_clks[CIX_USB_CLK_NUM];
+	unsigned int strap_offset;
+	unsigned int strap_bit;
+	struct regmap	*usb_syscon;
+	int lpm_clk_freq;
+	int sof_clk_freq;
+	bool u3_disable;
+	bool ssp_disable;
+	int axi_bmax_value;
+};
+
+#endif /* _CDNSP_SKY1_H */
-- 
2.54.0