linux-kernel - Re: [PATCH v2 1/6] dt-bindings: clock: qcom: Add GPU clocks for QCS8300

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Message-ID: <3b123fe4-12dd-4951-ad14-32159fd10089@kernel.org>
Date: Wed, 30 Oct 2024 12:41:45 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Imran Shaik <quic_imrashai@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Ajit Pandey <quic_ajipan@...cinc.com>,
 Taniya Das <quic_tdas@...cinc.com>, Jagadeesh Kona <quic_jkona@...cinc.com>,
 Satya Priya Kakitapalli <quic_skakitap@...cinc.com>,
 linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/6] dt-bindings: clock: qcom: Add GPU clocks for
 QCS8300

On 30/10/2024 12:23, Dmitry Baryshkov wrote:
> On Wed, Oct 30, 2024 at 08:30:59AM +0100, Krzysztof Kozlowski wrote:
>> On 30/10/2024 07:59, Imran Shaik wrote:
>>>
>>>
>>> On 10/29/2024 3:06 PM, Krzysztof Kozlowski wrote:
>>>> On 29/10/2024 10:23, Imran Shaik wrote:
>>>>>
>>>>>
>>>>> On 10/28/2024 12:35 PM, Krzysztof Kozlowski wrote:
>>>>>> On 28/10/2024 06:15, Imran Shaik wrote:
>>>>>>>
>>>>>>>
>>>>>>> On 10/26/2024 5:50 PM, Krzysztof Kozlowski wrote:
>>>>>>>> On Thu, Oct 24, 2024 at 07:01:14PM +0530, Imran Shaik wrote:
>>>>>>>>> The QCS8300 GPU clock controller is mostly identical to SA8775P, but
>>>>>>>>> QCS8300 has few additional clocks and minor differences. Hence, reuse
>>>>>>>>> SA8775P gpucc bindings and add additional clocks required for QCS8300.
>>>>>>>>
>>>>>>>> IIUC, these clocks are not valid for SA8775p. How do we deal with such
>>>>>>>> cases for other Qualcomm SoCs?
>>>>>>>>
>>>>>>>
>>>>>>> These newly added clocks are not applicable to SA8755P. In the
>>>>>>> gpucc-sa8775p driver, these clocks are marked to NULL for the SA8755P,
>>>>>>> ensuring they are not registered to the CCF.
>>>>>>
>>>>>> I meant bindings. And existing practice.
>>>>>>
>>>>>
>>>>> In the bindings, the same approach is followed in other Qualcomm SoCs as
>>>>> well, where additional clocks are added to the existing identical SoC’s
>>>>> bindings.
>>>>>
>>>>> https://lore.kernel.org/r/20240818204348.197788-2-danila@jiaxyga.com
>>>>
>>>> Exactly, defines are very different, so no, it is not the same approach.
>>>>
>>>
>>> I believe the QCS8300 approach is same as that of SM8475. In the SM8475 
>>> SoC, GPLL2 and GPLL3 are the additional clock bindings compared to the 
>>> SM8450. Similarly, in the QCS8300, the GPU_CC_*_ACCU_SHIFT_CLK clock 
>>> bindings are additional to the SA8775P.
>>>
>>> We are also following this approach across all SoCs in the downstream 
>>> msm-kernel as well.
>>>
>>> Please let me know if I am missing anything here.
>>
>> Not sure, please take the same approach as SM8475, not a different one.
> 
> Just for my understanding, are you proposing to prefix the
> platform-specific defines with platform name (like it was done for
> SM8475)?

Yes. Maybe SM8475 did something more, so let's take similar approach.

Best regards,
Krzysztof