linux-kernel - Re: [PATCH 6/15] dt-bindings: display: sun4i: Add HDMI display bindings

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Message-ID: <20170403205953.vdf5ynyvktpiheax@lukather>
Date:   Mon, 3 Apr 2017 22:59:53 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Chen-Yu Tsai <wens@...e.org>, dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 6/15] dt-bindings: display: sun4i: Add HDMI display
 bindings

Hi Rob,

On Wed, Mar 15, 2017 at 12:26:22PM -0500, Rob Herring wrote:
> > +HDMI Encoder
> > +------------
> > +
> > +The HDMI Encoder supports the HDMI video and audio outputs, and does
> > +CEC. It is one end of the pipeline.
> > +
> > +Required properties:
> > +  - compatible: value must be one of:
> > +    * allwinner,sun5i-a10s-hdmi
> > +  - reg: base address and size of memory-mapped region
> > +  - clocks: phandles to the clocks feeding the HDMI encoder
> > +    * ahb: the HDMI interface clock
> > +    * mod: the HDMI module clock
> > +    * pll-0: the first video PLL
> > +    * pll-1: the second video PLL
> > +  - clock-names: the clock names mentioned above
> > +
> > +  - ports: A ports node with endpoint definitions as defined in
> > +    Documentation/devicetree/bindings/media/video-interfaces.txt. The
> > +    first port should be the input endpoint.
> 
> You need an output port to an HDMI connector node and an audio port.

I started to look at the audio, and I can't find a use for an audio
port in the OF graph. As far as I understand, we will be using the
hdmi-codec, that still requires an ASoC card to create the link
between our i2s controller and the HDMI controller.

This work perfectly for us, but as far as I know, the simple-card
stuff only requires a phandle, and not an OF graph endpoint, right?

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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