linux-kernel - Re: [PATCH v8 01/11] dt-bindings: serial: Added secondary clock for RZ/T2H RSCI

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Message-ID: <20250509185858.GA3933854-robh@kernel.org>
Date: Fri, 9 May 2025 13:58:58 -0500
From: Rob Herring <robh@...nel.org>
To: Thierry Bultel <thierry.bultel.yh@...renesas.com>
Cc: thierry.bultel@...atsea.fr, linux-renesas-soc@...r.kernel.org,
	geert@...ux-m68k.org, paul.barker.ct@...renesas.com,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v8 01/11] dt-bindings: serial: Added secondary clock for
 RZ/T2H RSCI

On Tue, Apr 29, 2025 at 10:19:43AM +0200, Thierry Bultel wrote:
> At boot, the default clock is the PCLKM core lock (synchronous
> clock, which is enabled by the bootloader).
> For different baudrates, the asynchronous clock input must be used.
> Clock selection is made by an internal register of RCSI.
> 
> Signed-off-by: Thierry Bultel <thierry.bultel.yh@...renesas.com>
> ---
>  .../bindings/serial/renesas,rsci.yaml          | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/serial/renesas,rsci.yaml b/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
> index ea879db5f485..aa2428837a2f 100644
> --- a/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
> +++ b/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
> @@ -35,10 +35,14 @@ properties:
>        - const: tei
>  
>    clocks:
> -    maxItems: 1
> +    items:
> +      - description: serial functional clock
> +      - description: default core clock
>  
>    clock-names:
> -    const: fck # UART functional clock
> +    items:
> +      - const: async
> +      - const: bus

This is an ABI change. You can't just drop 'fck' without good reasons.

Rob