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Message-ID: <d8fba488-bdea-420b-84f2-a222315e1b81@linaro.org>
Date: Wed, 17 Jan 2024 12:19:48 +0100
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Subject: Re: [PATCH 2/3] dt-bindings: PCI: ti,j721e-pci-*: Add checks for
 max-link-speed
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To: Siddharth Vadapalli <s-vadapalli@ti.com>
Cc: bhelgaas@google.com, lpieralisi@kernel.org, kw@linux.com,
 robh@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
 linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 vigneshr@ti.com, afd@ti.com, srk@ti.com
References: <20240117102526.557006-1-s-vadapalli@ti.com>
 <20240117102526.557006-3-s-vadapalli@ti.com>
 <4282b248-cb7f-4486-bde6-105a3aed6be2@linaro.org>
 <92ceb1ea-78db-4bc4-af1f-a1690eaca24c@ti.com>
 <42f44ecc-c7f4-4209-8cb5-805891c35413@linaro.org>
 <e79a1896-470e-4fba-85b0-f857a4290cbb@ti.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <e79a1896-470e-4fba-85b0-f857a4290cbb@ti.com>
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On 17/01/2024 12:15, Siddharth Vadapalli wrote:
> 
> 
> On 17/01/24 16:30, Krzysztof Kozlowski wrote:
>> On 17/01/2024 11:58, Siddharth Vadapalli wrote:
>>> On 17/01/24 16:05, Krzysztof Kozlowski wrote:
>>>> On 17/01/2024 11:25, Siddharth Vadapalli wrote:
>>>>> Extend the existing compatible based checks for validating and enforcing
>>>>> the "max-link-speed" property.
>>>>
>>>> Based on what? Driver or hardware? Your entire change suggests you
>>>
>>> Hardware. The PCIe controller on AM64 SoC supports up to Gen2 link speed while
>>> the PCIe controllers on other SoCs support Gen3 link speed.
>>>
>>>> should just drop it from the binding, because this can be deduced from
>>>> compatible.
>>>
>>> Could you please clarify? Isn't the addition of the checks for "max-link-speed"
>>> identical to the checks which were added for "num-lanes", both of which are
>>> Hardware specific?
>>
>> Compatible defines these values, at least what it looks like from the patch.
> 
> In this patch, I have added checks for the "max-link-speed" property in the same
> section that "num-lanes" is being evaluated. 

I know what you did in patch. I read it.

> The values for "max-link-speed" are
> based on the Hardware support and this patch is validating the "max-link-speed"
> property in the device-tree nodes for the devices against the Hardware supported
> values which this patch is adding in the corresponding section. Kindly let me
> know if I misunderstood what you meant to convey.

Nothing of this is relevant.

I used two entirely different wordings for this and you still don't get
it, so I don't know if I have third one.

Maybe this:
Move it to driver match data.

So three entirely different wordings for the same. I don't have fourth...

Best regards,
Krzysztof