linux-kernel - Re: [PATCH 1/3] dt-bindings: clock: fix C3 PLL input parameter

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Message-ID: <43a600fb-8094-414d-8a3c-0573286a11f7@amlogic.com>
Date: Wed, 7 Aug 2024 14:40:18 +0800
From: Xianwei Zhao <xianwei.zhao@...ogic.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Krzysztof Kozlowski <krzk@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Jerome Brunet <jbrunet@...libre.com>,
 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>, Chuan Liu <chuan.liu@...ogic.com>,
 Kevin Hilman <khilman@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] dt-bindings: clock: fix C3 PLL input parameter

Hi Krzysztof,
    Thank you for your reply.

On 2024/8/7 13:44, Krzysztof Kozlowski wrote:
> [ EXTERNAL EMAIL ]
> 
> On 07/08/2024 03:55, Xianwei Zhao wrote:
>> Hi Krzysztof,
>>       Thanks for your review.
>>
>> On 2024/8/6 21:10, Krzysztof Kozlowski wrote:
>>> [ EXTERNAL EMAIL ]
>>>
>>> On 06/08/2024 12:27, Xianwei Zhao via B4 Relay wrote:
>>>> From: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>>>
>>>> Add C3 PLL controller input clock parameters "fix".
>>>
>>> What is "parameters" here? Why you are adding it? Is it missing?
>>> Something is not working?
>>>
>> Yes. The previous submission was lost.
> 
> What submission is lost?
> 
>>
>>>>
>>>> Fixes: 0e6be855a96d ("dt-bindings: clock: add Amlogic C3 PLL clock controller")
>>>
>>> Why? What bug are you fixing?
>>
>> The input clock of PLL clock controller need the clock whose fw_name is
>> called "fix".
> 
> Then explain this in commit msg.
> 
Will add this in commit msg.
>>>
>>>> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>>> ---
>>>>    Documentation/devicetree/bindings/clock/amlogic,c3-pll-clkc.yaml | 7 +++++--
>>>>    1 file changed, 5 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/clock/amlogic,c3-pll-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,c3-pll-clkc.yaml
>>>> index 43de3c6fc1cf..700865cc9792 100644
>>>> --- a/Documentation/devicetree/bindings/clock/amlogic,c3-pll-clkc.yaml
>>>> +++ b/Documentation/devicetree/bindings/clock/amlogic,c3-pll-clkc.yaml
>>>> @@ -24,11 +24,13 @@ properties:
>>>>        items:
>>>>          - description: input top pll
>>>>          - description: input mclk pll
>>>> +      - description: input fix pll
>>>>
>>>>      clock-names:
>>>>        items:
>>>>          - const: top
>>>>          - const: mclk
>>>> +      - const: fix
>>>
>>> and that's not an ABI break because?
>> This is "fixed" clock.
>> I will modify "fix" to "fixed",in next version.
> 
> With "fixed" it is still ABI break, right?
> No. The clock named "fixed" was initially implemented in the PLL clock 
controller driver, but some registers needed secure zone access,
so we put it in secure zone(BL31) implemented and access it through the 
SCMI. but the PLL clock driver need uses this clock, so the "fixed" 
clock is input as an input source,
We changed the driver and forgot to change the binding, so we added it here.
> Best regards,
> Krzysztof
>