linux-kernel - Re: [PATCH 2/3] dt-bindings: drm/bridge: ti-sn65dsi86: Add hpd-gpios to the bindings

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Date:   Wed, 15 Apr 2020 12:53:02 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Laurent.pinchart@...asonboard.com, a.hajda@...sung.com,
        airlied@...ux.ie, daniel@...ll.ch, narmstrong@...libre.com,
        robh+dt@...nel.org, spanda@...eaurora.org
Cc:     jonas@...boo.se, bjorn.andersson@...aro.org,
        devicetree@...r.kernel.org, jeffrey.l.hugo@...il.com,
        jernej.skrabec@...l.net, linux-arm-msm@...r.kernel.org,
        robdclark@...omium.org, dri-devel@...ts.freedesktop.org,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: drm/bridge: ti-sn65dsi86: Add hpd-gpios to the bindings

Quoting Douglas Anderson (2020-04-15 08:48:40)
> Allow people to specify to use a GPIO for hot-plug-detect.  Add an
> example.
> 
> NOTE: The current patch adding support for hpd-gpios to the Linux
> driver for hpd-gpios only adds enough support to the driver so that
> the bridge can use one of its own GPIOs.  The bindings, however, are
> written generically.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
>  .../bindings/display/bridge/ti,sn65dsi86.yaml          | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> index 8cacc6db33a9..554bfd003000 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> @@ -60,6 +60,10 @@ properties:
>      const: 1
>      description: See ../../pwm/pwm.yaml for description of the cell formats.
>  
> +  hpd-gpios:
> +    maxItems: 1
> +    description: If present use the given GPIO for hot-plug-detect.

Shouldn't this go in the panel node? And the panel driver should get the
gpio and poll it after powering up the panel? Presumably that's why we
have the no-hpd property in the simple panel binding vs. putting it here
in the bridge.