linux-kernel - Re: [PATCH 2/4] dt-bindings: display: amlogic, meson-dw-hdmi: Add optional HDMI 5V regulator

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Date:   Mon, 23 Oct 2017 17:46:25 -0500
From:   Rob Herring <robh@...nel.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     airlied@...ux.ie, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] dt-bindings: display: amlogic, meson-dw-hdmi: Add
 optional HDMI 5V regulator

On Tue, Oct 17, 2017 at 10:07:42AM +0200, Neil Armstrong wrote:
> On reference boards and derivatives, the HDMI Logic is powered by an external
> 5V regulator.
> This regulator was set by the Vendor U-Boot, add optional support for it.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.txt b/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.txt
> index 7f040ed..bf4a180 100644
> --- a/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.txt
> +++ b/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.txt
> @@ -48,6 +48,10 @@ Required properties:
>    Documentation/devicetree/bindings/reset/reset.txt,
>    the reset-names should be "hdmitx_apb", "hdmitx", "hdmitx_phy"
>  
> +Optional properties:
> +- hdmi-supply: Optional phandle to an external 5V regulator to power the HDMI
> +  logic, as described in the file ../regulator/regulator.txt

5V into a modern SoC sounds strange. Is this really for the chip or for 
5V to the connector? The latter should be in the connector node.

Rob