[PATCH v3 0/2] Add firmware-managed PCIe Endpoint support for SA8255P

[PATCH v3 0/2] Add firmware-managed PCIe Endpoint support for SA8255P

[Mrinmay Sarkar]

This patch series introduces support for Qualcomm SA8255P platform
where PCIe Endpoint resources are managed by firmware instead of
Linux driver. So the Linux driver should avoid redundant resource
management and relies on runtime PM calls to inform firmware for
resource management.

And documents the new compatible string "qcom,pcie-ep-sa8255p" for
SA8255P platforms in the device tree bindings.

Tested on Qualcomm SA8255P platform.

Signed-off-by: Mrinmay Sarkar <mrinmay.sarkar@oss.qualcomm.com>
---
Changes in v3:
- Updated compatible string in dt binding example node.
- Link to v2: https://lore.kernel.org/r/20251216-firmware_managed_ep-v2-0-7a731327307f@oss.qualcomm.com

Changes in v2:
- Updated dt binding as suggested by Krzysztof.
- Updated compatible string to match file name and compatible.
- Updated driver as suggested by bjorn.
- Link to v1: https://lore.kernel.org/r/20251203-firmware_managed_ep-v1-0-295977600fa5@oss.qualcomm.com

---
Mrinmay Sarkar (2):
      dt-bindings: PCI: qcom,pcie-ep-sa8255p: Document firmware managed PCIe endpoint
      PCI: qcom-ep: Add support for firmware-managed PCIe Endpoint

 .../bindings/pci/qcom,pcie-ep-sa8255p.yaml         | 110 +++++++++++++++++++++
 drivers/pci/controller/dwc/pcie-qcom-ep.c          |  82 +++++++++++----
 2 files changed, 172 insertions(+), 20 deletions(-)
---
base-commit: 563c8dd425b59e44470e28519107b1efc99f4c7b
change-id: 20251216-firmware_managed_ep-ff5d51846558

Best regards,
-- 
Mrinmay Sarkar <mrinmay.sarkar@oss.qualcomm.com>

[PATCH v3 1/2] dt-bindings: PCI: qcom,pcie-ep-sa8255p: Document firmware managed PCIe endpoint

[Mrinmay Sarkar]

Document the required configuration to enable the PCIe Endpoint controller
on SA8255p which is managed by firmware using power-domain based handling.

Signed-off-by: Mrinmay Sarkar <mrinmay.sarkar@oss.qualcomm.com>
---
 .../bindings/pci/qcom,pcie-ep-sa8255p.yaml         | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-ep-sa8255p.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-ep-sa8255p.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..395cd23861ec26c00d51299829f1c60116293cae
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie-ep-sa8255p.yaml
@@ -0,0 +1,110 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/qcom,pcie-ep-sa8255p.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm firmware managed PCIe Endpoint Controller
+
+description:
+  Qualcomm SA8255p SoC PCIe endpoint controller is based on the Synopsys
+  DesignWare PCIe IP which is managed by firmware.
+
+maintainers:
+  - Manivannan Sadhasivam <mani@kernel.org>
+
+properties:
+  compatible:
+    const: qcom,pcie-ep-sa8255p
+
+  reg:
+    items:
+      - description: Qualcomm-specific PARF configuration registers
+      - description: DesignWare PCIe registers
+      - description: External local bus interface registers
+      - description: Address Translation Unit (ATU) registers
+      - description: Memory region used to map remote RC address space
+      - description: BAR memory region
+      - description: DMA register space
+
+  reg-names:
+    items:
+      - const: parf
+      - const: dbi
+      - const: elbi
+      - const: atu
+      - const: addr_space
+      - const: mmio
+      - const: dma
+
+  interrupts:
+    items:
+      - description: PCIe Global interrupt
+      - description: PCIe Doorbell interrupt
+      - description: DMA interrupt
+
+  interrupt-names:
+    items:
+      - const: global
+      - const: doorbell
+      - const: dma
+
+  iommus:
+    maxItems: 1
+
+  reset-gpios:
+    description: GPIO used as PERST# input signal
+    maxItems: 1
+
+  wake-gpios:
+    description: GPIO used as WAKE# output signal
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  dma-coherent: true
+
+  num-lanes:
+    default: 2
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - interrupt-names
+  - reset-gpios
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+        pcie1_ep: pcie-ep@1c10000 {
+            compatible = "qcom,pcie-ep-sa8255p";
+            reg = <0x0 0x01c10000 0x0 0x3000>,
+                  <0x0 0x60000000 0x0 0xf20>,
+                  <0x0 0x60000f20 0x0 0xa8>,
+                  <0x0 0x60001000 0x0 0x4000>,
+                  <0x0 0x60200000 0x0 0x100000>,
+                  <0x0 0x01c13000 0x0 0x1000>,
+                  <0x0 0x60005000 0x0 0x2000>;
+            reg-names = "parf", "dbi", "elbi", "atu", "addr_space", "mmio", "dma";
+            interrupts = <GIC_SPI 518 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 152 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 474 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "global", "doorbell", "dma";
+            reset-gpios = <&tlmm 4 GPIO_ACTIVE_LOW>;
+            wake-gpios = <&tlmm 5 GPIO_ACTIVE_LOW>;
+            dma-coherent;
+            iommus = <&pcie_smmu 0x80 0x7f>;
+            power-domains = <&scmi6_pd 1>;
+            num-lanes = <4>;
+        };
+    };

-- 
2.25.1

Re: [PATCH v3 1/2] dt-bindings: PCI: qcom,pcie-ep-sa8255p: Document firmware managed PCIe endpoint

[Rob Herring (Arm)]

On Wed, 17 Dec 2025 15:42:45 +0530, Mrinmay Sarkar wrote:
> Document the required configuration to enable the PCIe Endpoint controller
> on SA8255p which is managed by firmware using power-domain based handling.
> 
> Signed-off-by: Mrinmay Sarkar <mrinmay.sarkar@oss.qualcomm.com>
> ---
>  .../bindings/pci/qcom,pcie-ep-sa8255p.yaml         | 110 +++++++++++++++++++++
>  1 file changed, 110 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/pci/qcom,pcie-ep-sa8255p.example.dtb: pcie-ep@1c10000 (qcom,pcie-ep-sa8255p): compatible: 'oneOf' conditional failed, one must be fixed:
	'qcom,pcie-ep-sa8255p' does not match '^qcom,(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+(pro)?-.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,sar[0-9]+[a-z]?-.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,(sa|sc)8[0-9]+[a-z][a-z]?-.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,(glymur|milos)-.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,[ak]pss-wdt-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,gcc-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,mmcc-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,pcie-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,rpm-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
	'qcom,pcie-ep-sa8255p' does not match '^qcom,scm-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+.*$'
	'qcom,pcie-ep-sa8255p' is not one of ['qcom,dsi-ctrl-6g-qcm2290', 'qcom,gpucc-sdm630', 'qcom,gpucc-sdm660', 'qcom,lcc-apq8064', 'qcom,lcc-ipq8064', 'qcom,lcc-mdm9615', 'qcom,lcc-msm8960', 'qcom,lpass-cpu-apq8016', 'qcom,usb-ss-ipq4019-phy', 'qcom,usb-hs-ipq4019-phy', 'qcom,vqmmc-ipq4019-regulator']
	'qcom,pcie-ep-sa8255p' is not one of ['qcom,ipq806x-gmac', 'qcom,ipq806x-nand', 'qcom,ipq806x-sata-phy', 'qcom,ipq806x-usb-phy-ss', 'qcom,ipq806x-usb-phy-hs']
	from schema $id: http://devicetree.org/schemas/arm/qcom-soc.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.kernel.org/project/devicetree/patch/20251217-firmware_managed_ep-v3-1-ff871ba688fb@oss.qualcomm.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

Re: [PATCH v3 1/2] dt-bindings: PCI: qcom,pcie-ep-sa8255p: Document firmware managed PCIe endpoint

[Mrinmay Sarkar]

On Wed, Dec 17, 2025 at 5:02 PM Rob Herring (Arm) <robh@kernel.org> wrote:
>
>
> On Wed, 17 Dec 2025 15:42:45 +0530, Mrinmay Sarkar wrote:
> > Document the required configuration to enable the PCIe Endpoint controller
> > on SA8255p which is managed by firmware using power-domain based handling.
> >
> > Signed-off-by: Mrinmay Sarkar <mrinmay.sarkar@oss.qualcomm.com>
> > ---
> >  .../bindings/pci/qcom,pcie-ep-sa8255p.yaml         | 110 +++++++++++++++++++++
> >  1 file changed, 110 insertions(+)
> >
>
> My bot found errors running 'make dt_binding_check' on your patch:
>
> yamllint warnings/errors:
>
> dtschema/dtc warnings/errors:
> /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/pci/qcom,pcie-ep-sa8255p.example.dtb: pcie-ep@1c10000 (qcom,pcie-ep-sa8255p): compatible: 'oneOf' conditional failed, one must be fixed:
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+(pro)?-.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,sar[0-9]+[a-z]?-.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,(sa|sc)8[0-9]+[a-z][a-z]?-.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,(glymur|milos)-.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,[ak]pss-wdt-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,gcc-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,mmcc-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,pcie-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,rpm-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
>         'qcom,pcie-ep-sa8255p' does not match '^qcom,scm-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+.*$'
>         'qcom,pcie-ep-sa8255p' is not one of ['qcom,dsi-ctrl-6g-qcm2290', 'qcom,gpucc-sdm630', 'qcom,gpucc-sdm660', 'qcom,lcc-apq8064', 'qcom,lcc-ipq8064', 'qcom,lcc-mdm9615', 'qcom,lcc-msm8960', 'qcom,lpass-cpu-apq8016', 'qcom,usb-ss-ipq4019-phy', 'qcom,usb-hs-ipq4019-phy', 'qcom,vqmmc-ipq4019-regulator']
>         'qcom,pcie-ep-sa8255p' is not one of ['qcom,ipq806x-gmac', 'qcom,ipq806x-nand', 'qcom,ipq806x-sata-phy', 'qcom,ipq806x-usb-phy-ss', 'qcom,ipq806x-usb-phy-hs']
>         from schema $id: http://devicetree.org/schemas/arm/qcom-soc.yaml
>
> doc reference errors (make refcheckdocs):
>
> See https://patchwork.kernel.org/project/devicetree/patch/20251217-firmware_managed_ep-v3-1-ff871ba688fb@oss.qualcomm.com
>
> The base for the series is generally the latest rc1. A different dependency
> should be noted in *this* patch.
>
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure 'yamllint' is installed and dt-schema is up to
> date:
>
> pip3 install dtschema --upgrade
>
> Please check and re-submit after running the above command yourself. Note
> that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> your schema. However, it must be unset to test all examples with your schema.


Hi Krzysztof,

As per our discussion in V1, you mentioned dt binding filename must
match the compatible
and I should rewrite compatible to match filename.

V1 discussion: https://lore.kernel.org/all/CAMyL0qO2FPBe7N6Q=hW-ymeiGDhABsU+VCj25jzcoQRhBoWbDA@mail.gmail.com/

So, I have changed compatible to match file name and it seems like
dt_binding_check is reporting errors.
As compatible: 'oneOf' conditional failed.

Can you please confirm if I can use previously used
compatible(qcom,sa8255p-pcie-ep) and update
file name accordingly as even in driver we are using this format for
other compatible.

Thanks,
Mrinmay

Re: [PATCH v3 1/2] dt-bindings: PCI: qcom,pcie-ep-sa8255p: Document firmware managed PCIe endpoint

[Krzysztof Kozlowski]

On 18/12/2025 10:44, Mrinmay Sarkar wrote:
> On Wed, Dec 17, 2025 at 5:02 PM Rob Herring (Arm) <robh@kernel.org> wrote:
>>
>>
>> On Wed, 17 Dec 2025 15:42:45 +0530, Mrinmay Sarkar wrote:
>>> Document the required configuration to enable the PCIe Endpoint controller
>>> on SA8255p which is managed by firmware using power-domain based handling.
>>>
>>> Signed-off-by: Mrinmay Sarkar <mrinmay.sarkar@oss.qualcomm.com>
>>> ---
>>>  .../bindings/pci/qcom,pcie-ep-sa8255p.yaml         | 110 +++++++++++++++++++++
>>>  1 file changed, 110 insertions(+)
>>>
>>
>> My bot found errors running 'make dt_binding_check' on your patch:
>>
>> yamllint warnings/errors:
>>
>> dtschema/dtc warnings/errors:
>> /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/pci/qcom,pcie-ep-sa8255p.example.dtb: pcie-ep@1c10000 (qcom,pcie-ep-sa8255p): compatible: 'oneOf' conditional failed, one must be fixed:
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+(pro)?-.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,sar[0-9]+[a-z]?-.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,(sa|sc)8[0-9]+[a-z][a-z]?-.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,(glymur|milos)-.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,[ak]pss-wdt-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,gcc-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,mmcc-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,pcie-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,rpm-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm)[0-9]+.*$'
>>         'qcom,pcie-ep-sa8255p' does not match '^qcom,scm-(apq|ipq|mdm|msm|qcm|qcs|q[dr]u|sa|sc|sd[amx]|sm|x1[ep])[0-9]+.*$'
>>         'qcom,pcie-ep-sa8255p' is not one of ['qcom,dsi-ctrl-6g-qcm2290', 'qcom,gpucc-sdm630', 'qcom,gpucc-sdm660', 'qcom,lcc-apq8064', 'qcom,lcc-ipq8064', 'qcom,lcc-mdm9615', 'qcom,lcc-msm8960', 'qcom,lpass-cpu-apq8016', 'qcom,usb-ss-ipq4019-phy', 'qcom,usb-hs-ipq4019-phy', 'qcom,vqmmc-ipq4019-regulator']
>>         'qcom,pcie-ep-sa8255p' is not one of ['qcom,ipq806x-gmac', 'qcom,ipq806x-nand', 'qcom,ipq806x-sata-phy', 'qcom,ipq806x-usb-phy-ss', 'qcom,ipq806x-usb-phy-hs']
>>         from schema $id: http://devicetree.org/schemas/arm/qcom-soc.yaml
>>
>> doc reference errors (make refcheckdocs):
>>
>> See https://patchwork.kernel.org/project/devicetree/patch/20251217-firmware_managed_ep-v3-1-ff871ba688fb@oss.qualcomm.com
>>
>> The base for the series is generally the latest rc1. A different dependency
>> should be noted in *this* patch.
>>
>> If you already ran 'make dt_binding_check' and didn't see the above
>> error(s), then make sure 'yamllint' is installed and dt-schema is up to
>> date:
>>
>> pip3 install dtschema --upgrade
>>
>> Please check and re-submit after running the above command yourself. Note
>> that DT_SCHEMA_FILES can be set to your schema file to speed up checking
>> your schema. However, it must be unset to test all examples with your schema.
> 
> 
> Hi Krzysztof,
> 
> As per our discussion in V1, you mentioned dt binding filename must
> match the compatible
> and I should rewrite compatible to match filename.
> 
> V1 discussion: https://lore.kernel.org/all/CAMyL0qO2FPBe7N6Q=hW-ymeiGDhABsU+VCj25jzcoQRhBoWbDA@mail.gmail.com/

You should respond to that discussion. When you question reviewers
comment, you respond to that comment, not somewhere else. That way I
have entire context and I already told you that when you were poking me
on private channels.

Bindings do not allow old (or incorrect) naming scheme for EP and I
already see EP compatibles were named with the proper new style, so
let's switch to that one - qcom,sa8255p-pcie-ep



Best regards,
Krzysztof

[PATCH v3 2/2] PCI: qcom-ep: Add support for firmware-managed PCIe Endpoint

[Mrinmay Sarkar]

Some Qualcomm platforms use firmware to manage PCIe resources such as
clocks, resets, and PHY through the SCMI interface. In these cases,
the Linux driver should not perform resource enable or disable
operations directly. Additionally, runtime PM support has been enabled
to ensure proper power state transitions.

This commit introduces a `firmware_managed` flag in the Endpoint
configuration structure. When set, the driver skips resource handling
and uses generic runtime PM calls to let firmware do resource management.

A new compatible string is added for SA8255P platforms where firmware
manages resources.

Signed-off-by: Mrinmay Sarkar <mrinmay.sarkar@oss.qualcomm.com>
---
 drivers/pci/controller/dwc/pcie-qcom-ep.c | 82 +++++++++++++++++++++++--------
 1 file changed, 62 insertions(+), 20 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index f1bc0ac81a928b928ab3f8cc7bf82558fc430474..2de8b48511169a9c836828c22860dba45f6c9db8 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -168,11 +168,13 @@ enum qcom_pcie_ep_link_status {
  * @hdma_support: HDMA support on this SoC
  * @override_no_snoop: Override NO_SNOOP attribute in TLP to enable cache snooping
  * @disable_mhi_ram_parity_check: Disable MHI RAM data parity error check
+ * @firmware_managed: Set if the Endpoint controller is firmware managed
  */
 struct qcom_pcie_ep_cfg {
 	bool hdma_support;
 	bool override_no_snoop;
 	bool disable_mhi_ram_parity_check;
+	bool firmware_managed;
 };
 
 /**
@@ -377,10 +379,17 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep)
 
 static void qcom_pcie_disable_resources(struct qcom_pcie_ep *pcie_ep)
 {
-	icc_set_bw(pcie_ep->icc_mem, 0, 0);
-	phy_power_off(pcie_ep->phy);
-	phy_exit(pcie_ep->phy);
-	clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks);
+	struct device *dev = pcie_ep->pci.dev;
+	int ret;
+
+	pm_runtime_put(dev);
+
+	if (!(pcie_ep->cfg && pcie_ep->cfg->firmware_managed)) {
+		icc_set_bw(pcie_ep->icc_mem, 0, 0);
+		phy_power_off(pcie_ep->phy);
+		phy_exit(pcie_ep->phy);
+		clk_bulk_disable_unprepare(pcie_ep->num_clks, pcie_ep->clks);
+	}
 }
 
 static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
@@ -390,12 +399,22 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
 	u32 val, offset;
 	int ret;
 
-	ret = qcom_pcie_enable_resources(pcie_ep);
-	if (ret) {
-		dev_err(dev, "Failed to enable resources: %d\n", ret);
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable endpoint device: %d\n", ret);
 		return ret;
 	}
 
+	/* Enable resources if Endpoint controller is not firmware-managed */
+	if (!(pcie_ep->cfg && pcie_ep->cfg->firmware_managed)) {
+		ret = qcom_pcie_enable_resources(pcie_ep);
+		if (ret) {
+			dev_err(dev, "Failed to enable resources: %d\n", ret);
+			pm_runtime_put(dev);
+			return ret;
+		}
+	}
+
 	/* Perform cleanup that requires refclk */
 	pci_epc_deinit_notify(pci->ep.epc);
 	dw_pcie_ep_cleanup(&pci->ep);
@@ -630,16 +649,6 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev,
 		return ret;
 	}
 
-	pcie_ep->num_clks = devm_clk_bulk_get_all(dev, &pcie_ep->clks);
-	if (pcie_ep->num_clks < 0) {
-		dev_err(dev, "Failed to get clocks\n");
-		return pcie_ep->num_clks;
-	}
-
-	pcie_ep->core_reset = devm_reset_control_get_exclusive(dev, "core");
-	if (IS_ERR(pcie_ep->core_reset))
-		return PTR_ERR(pcie_ep->core_reset);
-
 	pcie_ep->reset = devm_gpiod_get(dev, "reset", GPIOD_IN);
 	if (IS_ERR(pcie_ep->reset))
 		return PTR_ERR(pcie_ep->reset);
@@ -652,9 +661,22 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev,
 	if (IS_ERR(pcie_ep->phy))
 		ret = PTR_ERR(pcie_ep->phy);
 
-	pcie_ep->icc_mem = devm_of_icc_get(dev, "pcie-mem");
-	if (IS_ERR(pcie_ep->icc_mem))
-		ret = PTR_ERR(pcie_ep->icc_mem);
+	/* Populate resources if Endpoint controller is not firmware-managed */
+	if (!(pcie_ep->cfg && pcie_ep->cfg->firmware_managed)) {
+		pcie_ep->num_clks = devm_clk_bulk_get_all(dev, &pcie_ep->clks);
+		if (pcie_ep->num_clks < 0) {
+			dev_err(dev, "Failed to get clocks\n");
+			return pcie_ep->num_clks;
+		}
+
+		pcie_ep->core_reset = devm_reset_control_get_exclusive(dev, "core");
+		if (IS_ERR(pcie_ep->core_reset))
+			return PTR_ERR(pcie_ep->core_reset);
+
+		pcie_ep->icc_mem = devm_of_icc_get(dev, "pcie-mem");
+		if (IS_ERR(pcie_ep->icc_mem))
+			ret = PTR_ERR(pcie_ep->icc_mem);
+	}
 
 	return ret;
 }
@@ -874,6 +896,12 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, pcie_ep);
 
+	pm_runtime_get_noresume(dev);
+	pm_runtime_set_active(dev);
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return ret;
+
 	ret = qcom_pcie_ep_get_resources(pdev, pcie_ep);
 	if (ret)
 		return ret;
@@ -894,6 +922,12 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev)
 		goto err_disable_irqs;
 	}
 
+	ret = pm_runtime_put_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to disable endpoint device: %d\n", ret);
+		goto err_disable_irqs;
+	}
+
 	pcie_ep->debugfs = debugfs_create_dir(name, NULL);
 	qcom_pcie_ep_init_debugfs(pcie_ep);
 
@@ -930,7 +964,15 @@ static const struct qcom_pcie_ep_cfg cfg_1_34_0 = {
 	.disable_mhi_ram_parity_check = true,
 };
 
+static const struct qcom_pcie_ep_cfg cfg_1_34_0_fw_managed = {
+	.hdma_support = true,
+	.override_no_snoop = true,
+	.disable_mhi_ram_parity_check = true,
+	.firmware_managed = true,
+};
+
 static const struct of_device_id qcom_pcie_ep_match[] = {
+	{ .compatible = "qcom,pcie-ep-sa8255p", .data = &cfg_1_34_0_fw_managed},
 	{ .compatible = "qcom,sa8775p-pcie-ep", .data = &cfg_1_34_0},
 	{ .compatible = "qcom,sdx55-pcie-ep", },
 	{ .compatible = "qcom,sm8450-pcie-ep", },

-- 
2.25.1