diff mbox series

[V3,1/6] dt-bindings: phy: qcom,uniphy-pcie: Document PCIe uniphy

Message ID 20240830081132.4016860-2-quic_srichara@quicinc.com (mailing list archive)
State Not Applicable
Headers show
Series Enable IPQ5018 PCI support | expand

Commit Message

Sricharan Ramabadhran Aug. 30, 2024, 8:11 a.m. UTC
From: Nitheesh Sekar <quic_nsekar@quicinc.com>

Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5018.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
---
 [v3] Added reviewed-by tags

 .../phy/qcom,ipq5018-uniphy-pcie.yaml         | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml

Comments

Krzysztof Kozlowski Aug. 30, 2024, 8:23 a.m. UTC | #1
On Fri, Aug 30, 2024 at 01:41:27PM +0530, Sricharan R wrote:
> From: Nitheesh Sekar <quic_nsekar@quicinc.com>
> 
> Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5018.
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
> ---
>  [v3] Added reviewed-by tags
> 
>  .../phy/qcom,ipq5018-uniphy-pcie.yaml         | 70 +++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
> new file mode 100644
> index 000000000000..c04dd179eb8b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/qcom,ipq5018-uniphy-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm UNIPHY PCIe 28LP PHY controller for genx1, genx2
> +
> +maintainers:
> +  - Nitheesh Sekar <quic_nsekar@quicinc.com>
> +  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,ipq5018-uniphy-pcie-gen2x1
> +      - qcom,ipq5018-uniphy-pcie-gen2x2

... and now I wonder why there are two compatibles. Isn't the phy the
same? We talk about the same hardware?

Best regards,
Krzysztof
Sricharan Ramabadhran Sept. 4, 2024, 5:20 p.m. UTC | #2
On 8/30/2024 1:53 PM, Krzysztof Kozlowski wrote:
> On Fri, Aug 30, 2024 at 01:41:27PM +0530, Sricharan R wrote:
>> From: Nitheesh Sekar <quic_nsekar@quicinc.com>
>>
>> Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5018.
>>
>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
>> Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
>> ---
>>   [v3] Added reviewed-by tags
>>
>>   .../phy/qcom,ipq5018-uniphy-pcie.yaml         | 70 +++++++++++++++++++
>>   1 file changed, 70 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>> new file mode 100644
>> index 000000000000..c04dd179eb8b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>> @@ -0,0 +1,70 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/phy/qcom,ipq5018-uniphy-pcie.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm UNIPHY PCIe 28LP PHY controller for genx1, genx2
>> +
>> +maintainers:
>> +  - Nitheesh Sekar <quic_nsekar@quicinc.com>
>> +  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - qcom,ipq5018-uniphy-pcie-gen2x1
>> +      - qcom,ipq5018-uniphy-pcie-gen2x2
> 
> ... and now I wonder why there are two compatibles. Isn't the phy the
> same? We talk about the same hardware?
  We have 2 different physical phys. One with single lane and another
  with dual lane. Its same IP, but for 2 lanes, 2 sets of the phy
  specific registers needs to configured. So differentiating that here.

Regards,
  Sricharan
Krzysztof Kozlowski Sept. 4, 2024, 6:16 p.m. UTC | #3
On 04/09/2024 19:20, Sricharan Ramabadhran wrote:
> 
> 
> On 8/30/2024 1:53 PM, Krzysztof Kozlowski wrote:
>> On Fri, Aug 30, 2024 at 01:41:27PM +0530, Sricharan R wrote:
>>> From: Nitheesh Sekar <quic_nsekar@quicinc.com>
>>>
>>> Document the Qualcomm UNIPHY PCIe 28LP present in IPQ5018.
>>>
>>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>> Signed-off-by: Nitheesh Sekar <quic_nsekar@quicinc.com>
>>> Signed-off-by: Sricharan Ramabadhran <quic_srichara@quicinc.com>
>>> ---
>>>   [v3] Added reviewed-by tags
>>>
>>>   .../phy/qcom,ipq5018-uniphy-pcie.yaml         | 70 +++++++++++++++++++
>>>   1 file changed, 70 insertions(+)
>>>   create mode 100644 Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>>> new file mode 100644
>>> index 000000000000..c04dd179eb8b
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
>>> @@ -0,0 +1,70 @@
>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/phy/qcom,ipq5018-uniphy-pcie.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Qualcomm UNIPHY PCIe 28LP PHY controller for genx1, genx2
>>> +
>>> +maintainers:
>>> +  - Nitheesh Sekar <quic_nsekar@quicinc.com>
>>> +  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - qcom,ipq5018-uniphy-pcie-gen2x1
>>> +      - qcom,ipq5018-uniphy-pcie-gen2x2
>>
>> ... and now I wonder why there are two compatibles. Isn't the phy the
>> same? We talk about the same hardware?
>   We have 2 different physical phys. One with single lane and another
>   with dual lane. Its same IP, but for 2 lanes, 2 sets of the phy
>   specific registers needs to configured. So differentiating that here.

What you described, suggests using phy mode or num-lanes in PCI
controller, not separate compatible. It's the same IP.

Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
new file mode 100644
index 000000000000..c04dd179eb8b
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/qcom,ipq5018-uniphy-pcie.yaml
@@ -0,0 +1,70 @@ 
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/qcom,ipq5018-uniphy-pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm UNIPHY PCIe 28LP PHY controller for genx1, genx2
+
+maintainers:
+  - Nitheesh Sekar <quic_nsekar@quicinc.com>
+  - Sricharan Ramabadhran <quic_srichara@quicinc.com>
+
+properties:
+  compatible:
+    enum:
+      - qcom,ipq5018-uniphy-pcie-gen2x1
+      - qcom,ipq5018-uniphy-pcie-gen2x2
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: pipe
+
+  resets:
+    maxItems: 2
+
+  reset-names:
+    items:
+      - const: phy
+      - const: common
+
+  "#phy-cells":
+    const: 0
+
+  "#clock-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - "#phy-cells"
+  - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,gcc-ipq5018.h>
+    #include <dt-bindings/reset/qcom,gcc-ipq5018.h>
+
+    phy@86000 {
+        compatible = "qcom,ipq5018-uniphy-pcie-gen2x2";
+        reg = <0x86000 0x1000>;
+        clocks = <&gcc GCC_PCIE0_PIPE_CLK>;
+        clock-names = "pipe";
+        resets = <&gcc GCC_PCIE0_PHY_BCR>,
+                 <&gcc GCC_PCIE0PHY_PHY_BCR>;
+        reset-names = "phy", "common";
+        #phy-cells = <0>;
+        #clock-cells = <0>;
+    };