Re: [linux-sunxi] Re: [PATCH 02/12] drm: sun4i: Add support for enabling DDC I2C bus to dw_hdmi glue
From: Maxime Ripard
Date: Mon Apr 08 2019 - 04:47:26 EST
On Mon, Apr 08, 2019 at 03:28:24PM +0800, Chen-Yu Tsai wrote:
> On Mon, Apr 8, 2019 at 3:23 PM Maxime Ripard <maxime.ripard@xxxxxxxxxxx> wrote:
> > On Sat, Apr 06, 2019 at 01:45:04AM +0200, megous@xxxxxxxxxx wrote:
> > > From: Ondrej Jirman <megous@xxxxxxxxxx>
> > >
> > > Orange Pi 3 board requires enabling DDC I2C bus via some GPIO connected
> > > transistors, before it can be used. Model this as a power supply for DDC
> > > (via regulator framework).
> > >
> > > Signed-off-by: Ondrej Jirman <megous@xxxxxxxxxx>
> > The DDC bus itself is usually attached to the HDMI connector, so it
> > would make sense to make the supply also a property of the connector.
> I believe these are separate things. What this patch covers is power for
> a voltage shifter between the SoC and HDMI DDC pins. The HDMI connector's
> 5V supply to power the remote DDC chip is something else. And on the
> Orange Pi 3 they are indeed separate supplies.
Then maybe the endpoint link between the two would be the best place
to put this?
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
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