linux-kernel - Re: [PATCH v4 1/4] dt-bindings: clock: add ExynosAuto v920 SoC CMU bindings

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Message-ID: <8ee739e7-8405-49d7-93f8-f837effe169b@kernel.org>
Date: Thu, 25 Jul 2024 08:37:00 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "sunyeal.hong" <sunyeal.hong@...sung.com>, 'Rob Herring' <robh@...nel.org>
Cc: 'Sylwester Nawrocki' <s.nawrocki@...sung.com>,
 'Chanwoo Choi' <cw00.choi@...sung.com>,
 'Alim Akhtar' <alim.akhtar@...sung.com>,
 'Michael Turquette' <mturquette@...libre.com>,
 'Stephen Boyd' <sboyd@...nel.org>, 'Conor Dooley' <conor+dt@...nel.org>,
 linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/4] dt-bindings: clock: add ExynosAuto v920 SoC CMU
 bindings

On 25/07/2024 08:35, sunyeal.hong wrote:
> Hello Krzysztof,
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzk@...nel.org>
>> Sent: Thursday, July 25, 2024 3:21 PM
>> To: sunyeal.hong <sunyeal.hong@...sung.com>; 'Rob Herring'
>> <robh@...nel.org>
>> Cc: 'Sylwester Nawrocki' <s.nawrocki@...sung.com>; 'Chanwoo Choi'
>> <cw00.choi@...sung.com>; 'Alim Akhtar' <alim.akhtar@...sung.com>; 'Michael
>> Turquette' <mturquette@...libre.com>; 'Stephen Boyd' <sboyd@...nel.org>;
>> 'Conor Dooley' <conor+dt@...nel.org>; linux-samsung-soc@...r.kernel.org;
>> linux-clk@...r.kernel.org; devicetree@...r.kernel.org; linux-arm-
>> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
>> Subject: Re: [PATCH v4 1/4] dt-bindings: clock: add ExynosAuto v920 SoC
>> CMU bindings
>>
>> On 25/07/2024 05:03, sunyeal.hong wrote:
>>
>>> - dts
>>> cmu_misc: clock-controller@...20000 {
>>> 	compatible = "samsung,exynosautov920-cmu-misc";
>>> 	reg = <0x10020000 0x8000>;
>>> 	#clock-cells = <1>;
>>>
>>> 	clocks = <&xtcxo>,
>>> 		 <&cmu_top DOUT_CLKCMU_MISC_NOC>;
>>> 	clock-names = "oscclk",
>>> 		      "noc";
>>> };
>>>
>>> In this case, can you tell me how to handle it?
>>> And if a new clock item is added and a new cmu block uses only the clock
>> item added and oscclk, a problem may occur.
>>
>> The same problem was in your original version, so why suddenly it appeared?
>>
>> Anyway, why clock would be missing? You just wrote in the bindings that
>> there is such input clock.
>>
>> Best regards,
>> Krzysztof
>>
> 
> If I reflect Rob's review, it will be changed as below.
> 
> - yaml
> properties:
>   compatible:
>     enum:
>       - samsung,exynosautov920-cmu-top
>       - samsung,exynosautov920-cmu-peric0
> 
>   clocks:
>     minItems: 1
>     items:
>       - description: External reference clock (38.4 MHz)
>       - description: Block IP clock (from CMU_TOP)
>       - description: Block NOC clock (from CMU_TOP)
> 
>   clock-names:
>     minItems: 1
>     items:
>       - const: oscclk
>       - const: ip
>       - const: noc
> 
>   "#clock-cells":
>     const: 1
> 
>   reg:
>     maxItems: 1
> 
> if:
>     properties:
>       compatible:
>         enum:
>           - samsung,exynosautov920-cmu-misc
> 
>   then:
>     properties:
>       clocks:
>         minItems: 2
>         maxItems: 2
> 
>       clock-names:
>         minItems: 2
>         maxItems: 2
> 
> - device tree
> cmu_misc: clock-controller@...20000 {
> 	compatible = "samsung,exynosautov920-cmu-misc";
> 	reg = <0x10020000 0x8000>;
> 	#clock-cells = <1>;
> 
> 	clocks = <&xtcxo>,
> 		 <&cmu_top DOUT_CLKCMU_MISC_NOC>;
> 	clock-names = "oscclk",
> 		      "noc";
> };
> 
> In this case, ip should be used after oscclk, but misc does not use ip, so there is a problem in dt check.
> 
> The code of v4 version has clock items for each block, so there was no problem like this.
> - yaml(v4)
> 
>   if:
>     properties:
>       compatible:
>         contains:
>           const: samsung,exynosautov920-cmu-misc
> 
>   then:
>     properties:
>       clocks:
>         items:
>           - description: External reference clock (38.4 MHz)
>           - description: CMU_MISC NOC clock (from CMU_MISC)
> 
>       clock-names:
>         items:
>           - const: oscclk
>           - const: noc
> 
> If there is anything I misunderstand, please guide me.
> 

You did not address my questions at all instead just copied again the
same. It is not how it works.

I am not going to discuss like this.

Best regards,
Krzysztof