linux-kernel - Re: [PATCH v2 1/2] dt-bindings: display: rockchip: Add compatible for rk3568 HDMI

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Date:   Tue, 13 Jul 2021 11:23:29 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        hjc@...k-chips.com, heiko@...ech.de, airlied@...ux.ie,
        daniel@...ll.ch, robh+dt@...nel.org, algea.cao@...k-chips.com,
        andy.yan@...k-chips.com
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH v2 1/2] dt-bindings: display: rockchip: Add compatible for
 rk3568 HDMI

On 2021-07-07 13:03, Benjamin Gaignard wrote:
> Define a new compatible for rk3568 HDMI.
> This version of HDMI hardware block needs two new clocks hclk_vio and hclk
> to provide phy reference clocks.

Do you know what hclk_vio is and whether it's actually necessary? I 
don't see any mention of it downstream, and based on previous experience 
I'm suspicious that it might be just the parent of hclk, and thus should 
not need to be explicitly claimed by the device or baked into it's binding.

Robin.

> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
> version 2:
> - Add the clocks needed for the phy.
> 
>   .../bindings/display/rockchip/rockchip,dw-hdmi.yaml         | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-hdmi.yaml b/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-hdmi.yaml
> index 75cd9c686e985..cb8643b3a8b84 100644
> --- a/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-hdmi.yaml
> +++ b/Documentation/devicetree/bindings/display/rockchip/rockchip,dw-hdmi.yaml
> @@ -23,6 +23,7 @@ properties:
>         - rockchip,rk3288-dw-hdmi
>         - rockchip,rk3328-dw-hdmi
>         - rockchip,rk3399-dw-hdmi
> +      - rockchip,rk3568-dw-hdmi
>   
>     reg-io-width:
>       const: 4
> @@ -51,8 +52,11 @@ properties:
>             - vpll
>         - enum:
>             - grf
> +          - hclk_vio
> +          - vpll
> +      - enum:
> +          - hclk
>             - vpll
> -      - const: vpll
>   
>     ddc-i2c-bus:
>       $ref: /schemas/types.yaml#/definitions/phandle
>