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Message-ID: <2824fd42-d588-4a0b-b6f9-1e9cb6055d6a@linaro.org>
Date: Thu, 1 Feb 2024 08:31:58 +0100
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Subject: Re: [PATCH] dt-bindings: mfd: syscon: Add ti,k3-pcie-ctrl compatible
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To: Siddharth Vadapalli <s-vadapalli@ti.com>, Andrew Davis <afd@ti.com>
Cc: lee@kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
 conor+dt@kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 srk@ti.com
References: <20240131112342.1300893-1-s-vadapalli@ti.com>
 <be60e695-894e-4281-a62c-b77e45680293@ti.com>
 <91737281-8249-4fcb-b5bf-750c015b7c24@ti.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <91737281-8249-4fcb-b5bf-750c015b7c24@ti.com>
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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@ti.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

Best regards,
Krzysztof