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Date: Fri, 26 Apr 2019 15:02:50 -0500 From: Rob Herring <robh@...nel.org> To: linux-sunxi <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 <dri-devel@...ts.freedesktop.org>, devicetree@...r.kernel.org, "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, netdev <netdev@...r.kernel.org>, linux-stm32@...md-mailman.stormreply.com, "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org> Subject: Re: [PATCH v4 6/9] dt-bindings: display: hdmi-connector: Add DDC power supply On Fri, Apr 26, 2019 at 2:20 PM Ondřej Jirman <megous@...ous.com> wrote: > > On Fri, Apr 26, 2019 at 01:23:37PM -0500, Rob Herring wrote: > > 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'? > > Just to be sure, the schematic that inspired this change looks like this: > > https://megous.com/dl/tmp/33b2971de6943e9d.png > > HDMI-5V is always on, and what is really being enabled here are mosfets > connected to DDC_CEC_EN and not the HDMI-5V power supply. So in this case it > really is just for DDC. It is conceivable that some boards may need both to > enable 5V for HDMI circuitry and some separate power shifting logic for > DDC bus. Okay, not what I thought you were defining. DDC_CEC_EN is a GPIO line? I wouldn't characterize this as a voltage rail, so I don't think it should be a supply. Perhaps 'ddc-en-gpios'? We certainly want to make it clear this is not the 5V supply. Rob
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