linux-kernel - Re: [PATCH] dt-bindings: mfd: syscon: Add ti,k3-pcie-ctrl compatible

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Date: Thu, 1 Feb 2024 14:32:04 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC: Andrew Davis <afd@...com>, <lee@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: Re: [PATCH] dt-bindings: mfd: syscon: Add ti,k3-pcie-ctrl compatible

Hello Krzysztof,

On 01/02/24 13:01, Krzysztof Kozlowski wrote:
> On 01/02/2024 05:48, Siddharth Vadapalli wrote:
>> Hello Andrew,
>>
>> On 31/01/24 21:43, Andrew Davis wrote:
>>> On 1/31/24 5:23 AM, Siddharth Vadapalli wrote:
>>>> The PCIE_CTRL registers within the CTRL_MMR space of TI's K3 SoCs are
>>>> used to configure the link speed, lane count and mode of operation of
>>>> the respective PCIe instance. Add compatible for allowing the PCIe
>>>> driver to obtain a regmap for the PCIE_CTRL register within the System
>>>> Controller device-tree node in order to configure the PCIe instance
>>>> accordingly.
>>>>
>>>> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
>>>> ---
>>>>
>>>> This patch is based on linux-next tagged next-20240131.
>>>>
>>>>   Documentation/devicetree/bindings/mfd/syscon.yaml | 1 +
>>>>   1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/mfd/syscon.yaml
>>>> b/Documentation/devicetree/bindings/mfd/syscon.yaml
>>>> index 084b5c2a2a3c..da571a24e21f 100644
>>>> --- a/Documentation/devicetree/bindings/mfd/syscon.yaml
>>>> +++ b/Documentation/devicetree/bindings/mfd/syscon.yaml
>>>> @@ -73,6 +73,7 @@ properties:
>>>>                 - rockchip,rv1126-qos
>>>>                 - starfive,jh7100-sysmain
>>>>                 - ti,am654-dss-oldi-io-ctrl
>>>> +              - ti,k3-pcie-ctrl
>>>
>>> This might not be the same for all K3 devices, you should use
>>> the name of the first device which uses this, so:
>>>
>>> ti,j721e-pcie-ctrl
>>
>> It is the same for all K3 devices so far. However, since the convention appears
>> to be the first device that it is applicable to as you pointed out, I will post
>> the v2 patch for this accordingly.
> 
> This was repeated so many times... so one more. Compatibles are specific
> to SoC, not to family.
> 
> https://elixir.bootlin.com/linux/v6.1-rc1/source/Documentation/devicetree/bindings/writing-bindings.rst#L42

Thank you for reviewing the patch and sharing your feedback. I will make sure
not to repeat this in my future patches.

-- 
Regards,
Siddharth.