linux-kernel - Re: [PATCH v4 1/7] dt-bindings: clock: Add StarFive JH7110 PLL clock generator

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Message-ID: <20230602183922.649b8e88@blackhole.lan>
Date:   Fri, 2 Jun 2023 18:39:22 +0200
From:   Torsten Duwe <duwe@....de>
To:     Xingyu Wu <xingyu.wu@...rfivetech.com>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <yanhong.wang@...rfivetech.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Conor Dooley <conor@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        "Rob Herring" <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Hal Feng" <hal.feng@...rfivetech.com>,
        William Qiu <william.qiu@...rfivetech.com>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v4 1/7] dt-bindings: clock: Add StarFive JH7110 PLL
 clock generator

On Tue, 23 May 2023 10:56:43 +0800
Xingyu Wu <xingyu.wu@...rfivetech.com> wrote:

> On 2023/5/19 22:16, Conor Dooley wrote:
> > On Fri, May 19, 2023 at 03:57:33PM +0200, Torsten Duwe wrote:
> >> On Fri, May 12, 2023 at 10:20:30AM +0800, Xingyu Wu wrote:
> >> [...]
> >> >  #ifndef __DT_BINDINGS_CLOCK_STARFIVE_JH7110_CRG_H__
> >> >  #define __DT_BINDINGS_CLOCK_STARFIVE_JH7110_CRG_H__
> >> >  
> >> > +/* PLL clocks */
> >> > +#define JH7110_CLK_PLL0_OUT			0
> >> > +#define JH7110_CLK_PLL1_OUT			1
> >> > +#define JH7110_CLK_PLL2_OUT			2
> >> 
> >> In U-Boot commit 58c9c60b Yanhong Wang added:
> >> 
> >> +
> >> +#define JH7110_SYSCLK_PLL0_OUT                       190
> >> +#define JH7110_SYSCLK_PLL1_OUT                       191
> >> +#define JH7110_SYSCLK_PLL2_OUT                       192
> >> +
> >> +#define JH7110_SYSCLK_END                    193
> >> 
> >> in that respective file.
> >> 
> >> > +#define JH7110_PLLCLK_END			3
> >> > +
> >> >  /* SYSCRG clocks */
> >> >  #define JH7110_SYSCLK_CPU_ROOT			0
> >> 
> >> If the symbolic names referred to the same items, would it be possible
> >> to keep the two files in sync somehow?
> > 
> > Ohh, that's not good.. If you pass the U-Boot dtb to Linux it won't
> > understand the numbering. The headers are part of the dt-binding :/
> 
> Because PLL driver is separated from SYSCRG drivers in Linux,

Can you _please_ point me at that "PLL driver" "in Linux" ?
I seem to be unable to find it. All I can see is a stub in
drivers/clk/starfive/clk-starfive-jh7110-sys.c, which simply
sets the PLLs to 1000, 1066 and 1188 MHz fixed, respectively.

The comment above says

| They will be dropped and registered in the PLL clock driver instead.

and that's the one I'm looking for.

Thanks,

	Torsten