On Mon, Apr 08, 2019 at 02:17:27PM +0200, Ondřej Jirman wrote: > On Mon, Apr 08, 2019 at 10:47:14AM +0200, Maxime Ripard wrote: > > 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.rip...@bootlin.com> > > > wrote: > > > > > > > > On Sat, Apr 06, 2019 at 01:45:04AM +0200, meg...@megous.com wrote: > > > > > From: Ondrej Jirman <meg...@megous.com> > > > > > > > > > > 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 <meg...@megous.com> > > > > > > > > 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? > > Interestingly &hdmi node configures the DDC bus pins via pinctrl on the SoC > side, so I put this there too, because it's related to those pins. I'm not > sure > if that changes anything in the discussion.
It's kind of different though. The DDC controller is within the HDMI controller, which is inside the SoC. Just like the pin muxer. As far as the hardware goes, even on your board, you don't need that supply so that the signal gets out of the SoC. If the regulator is to power up some component on the path between the SoC and the connector, then it should be attached there. Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
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