Hi Archit, On Mon, Oct 03, 2016 at 04:40:57PM +0530, Archit Taneja wrote: > Hi Maxime, > > On 09/30/2016 08:07 PM, Maxime Ripard wrote: > >Some boards have an entirely passive RGB to VGA bridge, based on either > >DACs or resistor ladders. > > > >Those might or might not have an i2c bus routed to the VGA connector in > >order to access the screen EDIDs. > > > >Add a bridge that doesn't do anything but expose the modes available on the > >screen, either based on the EDIDs if available, or based on the XGA > >standards. > > > >Acked-by: Rob Herring <robh@xxxxxxxxxx> > >Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > >--- > > .../bindings/display/bridge/rgb-to-vga-bridge.txt | 48 +++++ > > drivers/gpu/drm/bridge/Kconfig | 7 + > > drivers/gpu/drm/bridge/Makefile | 1 + > > drivers/gpu/drm/bridge/rgb-to-vga.c | 229 +++++++++++++++++++++ > > 4 files changed, 285 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/display/bridge/rgb-to-vga-bridge.txt > > create mode 100644 drivers/gpu/drm/bridge/rgb-to-vga.c > > > >diff --git a/Documentation/devicetree/bindings/display/bridge/rgb-to-vga-bridge.txt b/Documentation/devicetree/bindings/display/bridge/rgb-to-vga-bridge.txt > >new file mode 100644 > >index 000000000000..a8375bc1f9cb > >--- /dev/null > >+++ b/Documentation/devicetree/bindings/display/bridge/rgb-to-vga-bridge.txt > >@@ -0,0 +1,48 @@ > >+Dumb RGB to VGA bridge > >+---------------------- > >+ > >+This binding is aimed for dumb RGB to VGA bridges that do not require > >+any configuration. > >+ > >+Required properties: > >+ > >+- compatible: Must be "rgb-to-vga-bridge" > > I'd talked to Laurent on IRC if he's okay with this. And I guess you to > had discussed it during XDC too. He's suggested that it'd be better to > have the compatible string as "simple-vga-dac". I just wished this bikeshedding had taken place publicly and be actually part of that discussion, but yeah, ok. > Some of the reasons behind having this: > > - We don't need to specify "rgb" in the compatible string since most > simple VGA DACs can only work with an RGB input. Ok. > - Also, with "dac" specified in the string, we don't need to > specifically mention "bridge" in the string. Also, bridge is a drm > specific term. > > - "simple" is considered because it's an unconfigurable bridge, and it > might be misleading for other VGA DACs to not use "vga-dac". All those "simple" bindings are just the biggest lie we ever told. It's simple when you introduce it, and then grows into something much more complicated than a non-simple implementation. > What do you think about this? If you think it's good, would it be > possible for you to change this? I guess it's okay for the rest of > the patch to stay the same. I'll update and respin the serie. Thanks, Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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