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

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Message-ID: <20230523-fondue-monotype-0c751a8f0c13@wendy>
Date:   Tue, 23 May 2023 09:28:39 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Xingyu Wu <xingyu.wu@...rfivetech.com>
CC:     Torsten Duwe <duwe@....de>, <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, May 23, 2023 at 10:56:43AM +0800, Xingyu Wu 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, the numbering
> starts from 0. But in Uboot, the PLL driver is included in the SYSCRG driver,
> and the number follows the SYSCRG.

Unfortunately, how you choose to construct your drivers has nothing to
do with this.
These defines/numbers appear in the dts and are part of the DT ABI.
The same dts is supposed to work for Linux & U-Boot.

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