Re: [PATCH 2/3] dt-bindings: clock: amlogic: t7: Add missing mpll3 parent clock

[Jerome Brunet <jbrunet@baylibre.com>]

On jeu. 05 mars 2026 at 15:43, Jian Hu <jian.hu@amlogic.com> wrote:

> The mpll3 clock is a valid parent clock for sd_emmc and mipi_isp on
> the Amlogic T7 SoC, but was missing from t7-peripherals-clkc.yaml.
> Add it to enable proper clock parent configuration for these peripherals.

... but this changes the index of the clocks after this mpll3, and those
index are supposed to be stable if I'm not mistaken.

It is indeed more convenient to have the optional clocks at the end
as it avoids writing multiple <0> in DT when we do not have them.

At the very least, your commit description should say that this change
will not break any existing DT because these bindings are not used yet.

I leave it to the DT folks to say if the change is OK in such case.

>
> Signed-off-by: Jian Hu <jian.hu@amlogic.com>
> ---
>  .../bindings/clock/amlogic,t7-peripherals-clkc.yaml       | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/clock/amlogic,t7-peripherals-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,t7-peripherals-clkc.yaml
> index 55bb73707d58..27cc1f331587 100644
> --- a/Documentation/devicetree/bindings/clock/amlogic,t7-peripherals-clkc.yaml
> +++ b/Documentation/devicetree/bindings/clock/amlogic,t7-peripherals-clkc.yaml
> @@ -24,7 +24,7 @@ properties:
>      const: 1
>  
>    clocks:
> -    minItems: 14
> +    minItems: 15
>      items:
>        - description: input oscillator
>        - description: input sys clk
> @@ -40,12 +40,13 @@ properties:
>        - description: input gp1 pll
>        - description: input mpll1
>        - description: input mpll2
> +      - description: input mpll3
>        - description: external input rmii oscillator (optional)
>        - description: input video pll0 (optional)
>        - description: external pad input for rtc (optional)
>  
>    clock-names:
> -    minItems: 14
> +    minItems: 15
>      items:
>        - const: xtal
>        - const: sys
> @@ -61,6 +62,7 @@ properties:
>        - const: gp1
>        - const: mpll1
>        - const: mpll2
> +      - const: mpll3
>        - const: ext_rmii
>        - const: vid_pll0
>        - const: ext_rtc
> @@ -98,6 +100,7 @@ examples:
>                       <&gp1 1>,
>                       <&mpll 4>,
>                       <&mpll 6>;
> +                     <&mpll 8>;
>              clock-names = "xtal",
>                            "sys",
>                            "fix",
> @@ -112,5 +115,6 @@ examples:
>                            "gp1",
>                            "mpll1",
>                            "mpll2";
> +                          "mpll3";
>          };
>      };

-- 
Jerome

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