linux-kernel - Re: [PATCH v2 01/16] dt-bindings: clock: at91: Split up per SoC partially

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Message-ID: <a1dff4af-d771-4424-869f-15d3b6bca013@tuxon.dev>
Date: Mon, 17 Feb 2025 11:11:44 +0200
From: Claudiu Beznea <claudiu.beznea@...on.dev>
To: Alexander Dahl <ada@...rsis.com>
Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Ryan Wanner <ryan.wanner@...rochip.com>,
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH v2 01/16] dt-bindings: clock: at91: Split up per SoC
 partially

Hi, Alexander,

On 10.02.2025 18:44, Alexander Dahl wrote:
> Before adding even more new indexes creating more holes in the
> clk at91 drivers pmc_data->chws arrays, split this up.
> 
> This is a partial split up only for SoCs affected by upcoming changes
> and by that PMC_MAIN + x hack, others could follow by the same scheme.
> 
> Binding splitup was proposed for several reasons:
> 
> 1) keep the driver code simple, readable, and efficient
> 2) avoid accidental array index duplication
> 3) avoid memory waste by creating more and more unused array members.
> 
> Old values are kept to not break dts, and to maintain dt ABI.
> 
> Link: https://lore.kernel.org/linux-devicetree/20250207-jailbird-circus-bcc04ee90e05@thorsis.com/T/#u
> Signed-off-by: Alexander Dahl <ada@...rsis.com>
> ---
> 
> Notes:
>     v2:
>     - new patch, not present in v1
> 
>  .../dt-bindings/clock/microchip,sam9x60-pmc.h | 19 +++++++++++
>  .../dt-bindings/clock/microchip,sam9x7-pmc.h  | 25 +++++++++++++++
>  .../clock/microchip,sama7d65-pmc.h            | 32 +++++++++++++++++++
>  .../dt-bindings/clock/microchip,sama7g5-pmc.h | 24 ++++++++++++++
>  4 files changed, 100 insertions(+)
>  create mode 100644 include/dt-bindings/clock/microchip,sam9x60-pmc.h
>  create mode 100644 include/dt-bindings/clock/microchip,sam9x7-pmc.h
>  create mode 100644 include/dt-bindings/clock/microchip,sama7d65-pmc.h
>  create mode 100644 include/dt-bindings/clock/microchip,sama7g5-pmc.h
> 

[ ...]

> diff --git a/include/dt-bindings/clock/microchip,sama7g5-pmc.h b/include/dt-bindings/clock/microchip,sama7g5-pmc.h
> new file mode 100644
> index 0000000000000..ad69ccdf9dc78
> --- /dev/null
> +++ b/include/dt-bindings/clock/microchip,sama7g5-pmc.h
> @@ -0,0 +1,24 @@
> +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
> +/*
> + * The constants defined in this header are being used in dts and in
> + * at91 sama7g5 clock driver.
> + */
> +
> +#ifndef _DT_BINDINGS_CLOCK_MICROCHIP_SAMA7G5_PMC_H
> +#define _DT_BINDINGS_CLOCK_MICROCHIP_SAMA7G5_PMC_H
> +
> +#include <dt-bindings/clock/at91.h>
> +
> +/* old from before bindings splitup */
> +#define SAMA7G5_PMC_MCK0	PMC_MCK		/* 1 */
> +#define SAMA7G5_PMC_UTMI	PMC_UTMI	/* 2 */
> +#define SAMA7G5_PMC_MAIN	PMC_MAIN	/* 3 */
> +#define SAMA7G5_PMC_CPUPLL	PMC_CPUPLL	/* 4 */
> +#define SAMA7G5_PMC_SYSPLL	PMC_SYSPLL	/* 5 */
> +
> +#define SAMA7G5_PMC_AUDIOPMCPLL	PMC_AUDIOPMCPLL	/* 9 */
> +#define SAMA7G5_PMC_AUDIOIOPLL	PMC_AUDIOIOPLL	/* 10 */
> +
> +#define SAMA7G5_PMC_MCK1	PMC_MCK1	/* 13 */
> +
> +#endif

I would have expected this to be something like:

#ifndef __DT_BINDINGS_CLOCK_MICROCHIP_SAMA7G5_PMC_H__
#define __DT_BINDINGS_CLOCK_MICROCHIP_SAMA7G5_PMC_H__

/* Core clocks. */
#define SAMA7G5_MCK0			1
#define SAMA7G5_UTMI			2
#define SAMA7G5_MAIN			3
#define SAMA7G5_CPUPLL			4
#define SAMA7G5_SYSPLL			5
#define SAMA7G5_DDRPLL			6
#define SAMA7G5_IMGPLL			7
#define SAMA7G5_BAUDPLL			8

// ...

#define SAMA7G5_MCK1			13

#endif /* __DT_BINDINGS_CLOCK_MICROCHIP_SAMA7G5_PMC_H__ */

Same for the other affected SoCs.

The content of include/dt-bindings/clock/at91.h would be limited eventually
only to the PMC clock types.

The other "#define PMC_*" defines will eventually go to SoC specific
bindings. "#define AT91_PMC_*" seems to not belong here anyway and these
would in the end removed, as well.

Thank you,
Claudiu