linux-kernel - Re: [PATCH] dt-bindings: clock: samsung,s3c6400-clock: convert to DT Schema

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Date: Sun, 17 Mar 2024 15:49:11 +0000
From: Conor Dooley <conor@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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>, Rob Herring <robh@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] dt-bindings: clock: samsung,s3c6400-clock: convert to DT
 Schema

On Sun, Mar 17, 2024 at 04:26:55PM +0100, Krzysztof Kozlowski wrote:
> On 17/03/2024 16:23, Conor Dooley wrote:
> > On Tue, Mar 12, 2024 at 07:50:35PM +0100, Krzysztof Kozlowski wrote:
> >> Convert Samsung S3C6400/S3C6410 SoC clock controller bindings to DT
> >> schema.
> > 
> >> +description: |
> >> +  There are several clocks that are generated outside the SoC. It is expected
> >> +  that they are defined using standard clock bindings with following
> >> +  clock-output-names:
> >> +   - "fin_pll" - PLL input clock (xtal/extclk) - required,
> >> +   - "xusbxti" - USB xtal - required,
> >> +   - "iiscdclk0" - I2S0 codec clock - optional,
> >> +   - "iiscdclk1" - I2S1 codec clock - optional,
> >> +   - "iiscdclk2" - I2S2 codec clock - optional,
> >> +   - "pcmcdclk0" - PCM0 codec clock - optional,
> >> +   - "pcmcdclk1" - PCM1 codec clock - optional, only S3C6410.
> > 
> > I know you've only transfered this from the text binding, but what is
> > the relevance of this to the binding for this clock controller? This
> > seems to be describing some ?fixed? clocks that must be provided in
> > addition to this controller. I guess there's probably no other suitable
> > place to mention these?
> 
> To make it correct, these should be made clock inputs to the clock
> controller, even if the driver does not take them, however that's
> obsolete platform which might be removed from kernel this or next year,
> so I don't want to spend time on it.

I think the comment should probably mention that these are the expected
inputs, part of me thought that that was what you were getting at but I
wasn't sure if instead they were inputs to some other IP on the SoC.

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