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

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Message-ID: <041c01dade67$5842edf0$08c8c9d0$@samsung.com>
Date: Thu, 25 Jul 2024 16:50:40 +0900
From: "sunyeal.hong" <sunyeal.hong@...sung.com>
To: "'Krzysztof Kozlowski'" <krzk@...nel.org>, "'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

Hello Krzysztof,

> -----Original Message-----
> From: Krzysztof Kozlowski <krzk@...nel.org>
> Sent: Thursday, July 25, 2024 4:32 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 09:14, sunyeal.hong wrote:
> > Hello Krzysztof,
> >
> >> -----Original Message-----
> >> From: Krzysztof Kozlowski <krzk@...nel.org>
> >> Sent: Thursday, July 25, 2024 3:41 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 08:37, Krzysztof Kozlowski wrote:
> >>>>   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.
> >>
> >> And in case it is still unclear - just look at your bindings and DTS.
> >> They say you have three clocks!
> >>
> >> Best regards,
> >> Krzysztof
> >>
> >
> > Let me answer your questions first.
> > In the existing V4 patch, clock items were declared in if then for each
> block, so there was no problem.
> 
> No. Again, look at your binding and DTS.
> 
> 1. What clocks did you define for cmu-top?
Cmu-top has one clock(oscclk).
> 2. What clocks did you define for cmu-peric0?
Cmu-peric0 has three clocks(oscclk, noc and ip)
> 
> Rob's advice is reasonable and you must follow it, unless you are not
> telling us something. There is no other choice, no other compatibles, no
> other devices.
> 
Yes, that's right. In this patch, modifications are possible according to Rob's review.
> > If modified according to Rob's comment, problems may occur as the input
> clock is configured differently for each block.
> 
> But it is not! Look at your binding.
The reason I mentioned this was to ask how to handle problems that may occur when adding cmu for a new block in a new patch.
As you mentioned, this issue does not exist in this patch.
> 
> 
> Best regards,
> Krzysztof

Best regard,
sunyeal