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Date:   Fri, 26 Apr 2019 13:23:37 -0500
From:   Rob Herring <robh@...nel.org>
To:     megous@...ous.com
Cc:     linux-sunxi@...glegroups.com,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH v4 6/9] dt-bindings: display: hdmi-connector: Add DDC
 power supply

On Sat, Apr 13, 2019 at 06:54:15PM +0200, megous@...ous.com wrote:
> From: Ondrej Jirman <megous@...ous.com>
> 
> Some Allwinner SoC using boards (Orange Pi 3 for example) need to enable
> on-board voltage shifting logic for the DDC bus to be usable. Use
> ddc-supply on the hdmi-connector to model this.
> 
> Add binding documentation for optional ddc-supply property.
> 
> Signed-off-by: Ondrej Jirman <megous@...ous.com>
> ---
>  .../devicetree/bindings/display/connector/hdmi-connector.txt     | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/connector/hdmi-connector.txt b/Documentation/devicetree/bindings/display/connector/hdmi-connector.txt
> index 508aee461e0d..33085aeb0bb9 100644
> --- a/Documentation/devicetree/bindings/display/connector/hdmi-connector.txt
> +++ b/Documentation/devicetree/bindings/display/connector/hdmi-connector.txt
> @@ -9,6 +9,7 @@ Optional properties:
>  - label: a symbolic name for the connector
>  - hpd-gpios: HPD GPIO number
>  - ddc-i2c-bus: phandle link to the I2C controller used for DDC EDID probing
> +- ddc-supply: the power supply for the DDC bus

It's not just for DDC. It powers the chips in bridge dongles for 
example. Pretty much every diagram I find just calls it 5V or +5V.

So how about '5V-supply' or 'v5V-supply'?

Rob

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