linux-kernel - Re: [PATCH v5 3/4] dt-bindings: clock: rk3588: export PCLK

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Message-ID: <f58c8f3f-7b34-47e7-a33a-bddb6106fec7@linaro.org>
Date:   Thu, 9 Nov 2023 11:24:56 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     zhangqing <zhangqing@...k-chips.com>,
        Conor Dooley <conor.dooley@...rochip.com>
Cc:     Conor Dooley <conor@...nel.org>, mturquette@...libre.com,
        sboyd@...nel.org, kever.yang@...k-chips.com, heiko@...ech.de,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        huangtao@...k-chips.com, andy.yan@...k-chips.com,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: Re: [PATCH v5 3/4] dt-bindings: clock: rk3588: export PCLK_VO1GRF clk
 id

On 09/11/2023 11:05, zhangqing wrote:
> 
> 在 2023/11/9 17:21, Krzysztof Kozlowski 写道:
>> On 09/11/2023 09:06, zhangqing wrote:
>>> 在 2023/11/9 15:29, Conor Dooley 写道:
>>>> On Thu, Nov 09, 2023 at 02:27:38PM +0800, zhangqing wrote:
>>>>> Hi:
>>>>>
>>>>> 在 2023/11/8 20:01, Conor Dooley 写道:
>>>>>> On Wed, Nov 08, 2023 at 02:18:21PM +0800, Elaine Zhang wrote:
>>>>>>> export PCLK_VO1GRF for DT.
>>>>>>>
>>>>>>> Signed-off-by: Elaine Zhang <zhangqing@...k-chips.com>
>>>>>>> ---
>>>>>>>     include/dt-bindings/clock/rockchip,rk3588-cru.h | 3 ++-
>>>>>>>     1 file changed, 2 insertions(+), 1 deletion(-)
>>>>>>>
>>>>>>> diff --git a/include/dt-bindings/clock/rockchip,rk3588-cru.h b/include/dt-bindings/clock/rockchip,rk3588-cru.h
>>>>>>> index 5790b1391201..50ba72980190 100644
>>>>>>> --- a/include/dt-bindings/clock/rockchip,rk3588-cru.h
>>>>>>> +++ b/include/dt-bindings/clock/rockchip,rk3588-cru.h
>>>>>>> @@ -733,8 +733,9 @@
>>>>>>>     #define ACLK_AV1_PRE			718
>>>>>>>     #define PCLK_AV1_PRE			719
>>>>>>>     #define HCLK_SDIO_PRE			720
>>>>>>> +#define PCLK_VO1GRF			721
>>>>>>> -#define CLK_NR_CLKS			(HCLK_SDIO_PRE + 1)
>>>>>>> +#define CLK_NR_CLKS			(PCLK_VO1GRF + 1)
>>>>>> This definition is part of the ABI, if it is safe to change it, then it
>>>>>> is safe to delete it.
>>>>> The new ID is to solve the niu clock dependency problem(Used in PATCH V5
>>>>> 4/4).This new ID will also be used in DTS in the future.
>>>>>
>>>>> CLK_NR_CLKS represents the number of clocks used by the
>>>>> drivers/clk/rockchip/clk-rkxxx.c. It is safe to modify it, but cannot delete
>>>>> it.
>>>> Then delete it from the header and move it to clk-rkxxx.c
>>> I don't think it's more appropriate to move to clk-rkxxx.c.
>>> Because if there are new requirements later, and add new clk id, it is
>>> not in the same file, maybe forget to modify CLK_NR_CLKS.
>> Then you are not allowed to change it. It's part of ABI.
> 
> If you just don't want me to modify CLK_NR_CLKS, can I use an unused ID, 
> like [PATCH V4 3/4]:
> 
> -#define MBIST_MCLK_PDM1                        24
> +#define PCLK_VO1GRF                    24

You cannot change the ABI.

I don't understand why do you insist on this path. You got clear
comments: either this is ABI, so it cannot be changed, or it has to be
dropped. You know insist on some third path. There is no such.

Best regards,
Krzysztof