Re: [PATCH v7 01/10] dt-bindings: display: rockchip: analogix-dp: Fix hclk as third clock for RK3588

[Damon Ding <damon.ding@rock-chips.com>]

On 5/25/2026 4:20 PM, Damon Ding wrote:
> RK3588 eDP controller requires HCLK_VO1 to access the VO1 GRF
> registers and enable the video datapath.
> 
> Previously, the clock was enabled implicitly via the 'rockchip,vo-grf'
> phandle reference, which allowed the eDP to work without explicitly
> managing the hclk_vo1 clock. However, this is not safe or explicit.
> 
> To make the clock dependency explicit, enforce per-SoC clock-names
> requirements:
>   - RK3288: 2 clocks (dp, pclk)
>   - RK3399: 3 clocks (dp, pclk, grf)
>   - RK3588: 3 clocks (dp, pclk, hclk)
> 
> Do not reuse the 'grf' clock name for RK3588 because it represents
> a different clock with distinct control logic:
> - The 'grf' clock is only for GRF register access and is toggled
>    dynamically during register access.
> - The 'hclk' clock controls both GRF access and video datapath
>    gating, and must remain enabled during probe.
> 
> Fixes: f855146263b1 ("dt-bindings: display: rockchip: analogix-dp: Add support for RK3588")
> Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
> 
> ---
> 
> Changes in v4:
> - Modify the commit msg.
> 
> Changes in v5:
> - Enforce the correct third clock name on a per-compatible basis.
> - Modify the commit msg simultaneously.
> 
> Changes in v6:
> - Expand more detail commit msg about using hclk instead of grf clock.
> 
> Changes in v7:
> - List all valid clock names at the top level, and constrain the clock
>    count for each platform with minItems/maxItems in allOf.
> ---
>   .../rockchip/rockchip,analogix-dp.yaml        | 34 ++++++++++++++++++-
>   1 file changed, 33 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml b/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml
> index d99b23b88cc5..7fe7655c1f37 100644
> --- a/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml
> +++ b/Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml
> @@ -26,7 +26,9 @@ properties:
>       items:
>         - const: dp
>         - const: pclk
> -      - const: grf
> +      - enum:
> +        - grf
> +        - hclk

./Documentation/devicetree/bindings/display/rockchip/rockchip,analogix-dp.yaml:34:9: 
[warning] wrong indentation: expected 10 but found 8 (indentation)

Will fix in v8.

Best regards,
Damon

>   
>     power-domains:
>       maxItems: 1
> @@ -60,6 +62,32 @@ required:
>   allOf:
>     - $ref: /schemas/display/bridge/analogix,dp.yaml#
>   
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - rockchip,rk3288-dp
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 2
> +        clock-names:
> +          maxItems: 2
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - rockchip,rk3399-edp
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 3
> +        clock-names:
> +          minItems: 3
> +
>     - if:
>         properties:
>           compatible:
> @@ -68,6 +96,10 @@ allOf:
>                 - rockchip,rk3588-edp
>       then:
>         properties:
> +        clocks:
> +          minItems: 3
> +        clock-names:
> +          minItems: 3
>           resets:
>             minItems: 2
>           reset-names: