[PATCH] dt-bindings: usb: dwc3-st: convert to dt schema

[Kanak Shilledar <kanakshilledar@gmail.com>]

Convert ST DWC3 glue logic bindings to DT schema. Added missing includes
in example, modified the example to be similar to the actual .dts file
and removed st,syscon from the required property, added st,syscfg
property.

Signed-off-by: Kanak Shilledar <kanakshilledar@gmail.com>
---
 .../devicetree/bindings/usb/dwc3-st.txt       |  66 ----------
 .../bindings/usb/st,stih407-dwc3.yaml         | 123 ++++++++++++++++++
 2 files changed, 123 insertions(+), 66 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/usb/dwc3-st.txt
 create mode 100644 Documentation/devicetree/bindings/usb/st,stih407-dwc3.yaml

diff --git a/Documentation/devicetree/bindings/usb/dwc3-st.txt b/Documentation/devicetree/bindings/usb/dwc3-st.txt
deleted file mode 100644
index 4aa368447b1e..000000000000
--- a/Documentation/devicetree/bindings/usb/dwc3-st.txt
+++ /dev/null
@@ -1,66 +0,0 @@
-ST DWC3 glue logic
-
-This file documents the parameters for the dwc3-st driver.
-This driver controls the glue logic used to configure the dwc3 core on
-STiH407 based platforms.
-
-Required properties:
- - compatible	: must be "st,stih407-dwc3"
- - reg		: glue logic base address and USB syscfg ctrl register offset
- - reg-names	: should be "reg-glue" and "syscfg-reg"
- - st,syscon	: should be phandle to system configuration node which
-		  encompasses the glue registers
- - resets	: list of phandle and reset specifier pairs. There should be two entries, one
-		  for the powerdown and softreset lines of the usb3 IP
- - reset-names	: list of reset signal names. Names should be "powerdown" and "softreset"
-See: Documentation/devicetree/bindings/reset/st,stih407-powerdown.yaml
-See: Documentation/devicetree/bindings/reset/reset.txt
-
- - #address-cells, #size-cells : should be '1' if the device has sub-nodes
-   with 'reg' property
-
- - pinctl-names	: A pinctrl state named "default" must be defined
-See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-
- - pinctrl-0	: Pin control group
-See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-
- - ranges	: allows valid 1:1 translation between child's address space and
-		  parent's address space
-
-Sub-nodes:
-The dwc3 core should be added as subnode to ST DWC3 glue as shown in the
-example below. The DT binding details of dwc3 can be found in:
-Documentation/devicetree/bindings/usb/snps,dwc3.yaml
-
-NB: The dr_mode property described in [1] is NOT optional for this driver, as the default value
-is "otg", which isn't supported by this SoC. Valid dr_mode values for dwc3-st are either "host"
-or "device".
-
-[1] Documentation/devicetree/bindings/usb/usb-drd.yaml
-
-Example:
-
-st_dwc3: dwc3@8f94000 {
-	compatible	= "st,stih407-dwc3";
-	reg		= <0x08f94000 0x1000>, <0x110 0x4>;
-	reg-names	= "reg-glue", "syscfg-reg";
-	st,syscfg	= <&syscfg_core>;
-	resets		= <&powerdown STIH407_USB3_POWERDOWN>,
-			  <&softreset STIH407_MIPHY2_SOFTRESET>;
-	reset-names	= "powerdown", "softreset";
-	#address-cells	= <1>;
-	#size-cells	= <1>;
-	pinctrl-names	= "default";
-	pinctrl-0	= <&pinctrl_usb3>;
-	ranges;
-
-	dwc3: dwc3@9900000 {
-		compatible	= "snps,dwc3";
-		reg		= <0x09900000 0x100000>;
-		interrupts	= <GIC_SPI 155 IRQ_TYPE_NONE>;
-		dr_mode		= "host";
-		phy-names	= "usb2-phy", "usb3-phy";
-		phys		= <&usb2_picophy2>, <&phy_port2 PHY_TYPE_USB3>;
-	};
-};
diff --git a/Documentation/devicetree/bindings/usb/st,stih407-dwc3.yaml b/Documentation/devicetree/bindings/usb/st,stih407-dwc3.yaml
new file mode 100644
index 000000000000..709cdb17f28d
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/st,stih407-dwc3.yaml
@@ -0,0 +1,123 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/st,stih407-dwc3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ST DWC3 glue logic
+
+description:
+  This binding describes the parameters for the dwc3-st driver,
+  which controls the glue logic used to configure the DWC3 core on
+  STiH407-based platforms.
+
+maintainers:
+  - Mauro Carvalho Chehab <mchehab@kernel.org>
+
+properties:
+  compatible:
+    const: st,stih407-dwc3
+
+  reg:
+    # minItems: 2
+    items:
+      - description: Glue logic base address.
+      - description: USB syscfg ctrl register offset.
+
+  reg-names:
+    # minItems: 2
+    items:
+      - const: reg-glue
+      - const: syscfg-reg
+
+  st,syscon:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Phandle to system configuration node which.
+
+  resets:
+    maxItems: 2
+
+  reset-names:
+    items:
+      - const: powerdown
+      - const: softreset
+
+  st,syscfg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 1
+
+  pinctrl-names:
+    items:
+      - const: default
+
+  pinctrl-0:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      Pin control group
+      See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+
+  ranges:
+    description: Valid 1:1 translation between child's and parent's address space.
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - resets
+  - reset-names
+  - pinctrl-names
+  - pinctrl-0
+  - ranges
+
+additionalProperties: false
+
+patternProperties:
+  "^usb@[0-9a-f]+$":
+    type: object
+    description: DWC3 core sub-node
+    $ref: snps,dwc3.yaml#
+    unevaluatedProperties: false
+    properties:
+      dr_mode:
+        enum:
+          - host
+          - device
+        description: |
+          Specifies the operating mode. The default value "otg" is not
+          supported by this SoC. Valid values are "host" or "device".
+          See: Documentation/devicetree/bindings/usb/usb-drd.yaml
+
+examples:
+  - |
+    #include <dt-bindings/phy/phy.h>
+    #include <dt-bindings/reset/stih407-resets.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    st_dwc3: dwc3@8f94000 {
+        compatible	= "st,stih407-dwc3";
+        reg		= <0x08f94000 0x1000>, <0x110 0x4>;
+        reg-names	= "reg-glue", "syscfg-reg";
+        st,syscfg	= <&syscfg_core>;
+        resets		= <&powerdown STIH407_USB3_POWERDOWN>,
+              <&softreset STIH407_MIPHY2_SOFTRESET>;
+        reset-names	= "powerdown", "softreset";
+        #address-cells	= <1>;
+        #size-cells	= <1>;
+        pinctrl-names	= "default";
+        pinctrl-0	= <&pinctrl_usb3>;
+        ranges;
+
+        dwc3: usb@9900000 {
+            compatible	= "snps,dwc3";
+            reg		= <0x09900000 0x100000>;
+            interrupts	= <GIC_SPI 155 IRQ_TYPE_NONE>;
+            dr_mode		= "host";
+            phy-names	= "usb2-phy", "usb3-phy";
+            phys		= <&usb2_picophy2>, <&phy_port2 PHY_TYPE_USB3>;
+        };
+    };
-- 
2.34.1