On Fri, Jul 18, 2014 at 05:43:34PM +0200, Boris BREZILLON wrote:
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+ - atmel,panel: Should contain a phandle with 2 parameters.
+   The first cell is a phandle to a DRM panel device
+   The second cell encodes the RGB mode, which can take the following values:
+   * 0: RGB444
+   * 1: RGB565
+   * 2: RGB666
+   * 3: RGB888

These are properties of the panel and should be obtained from the panel
directly rather than an additional cell in this specifier.

Okay.
What's the preferred way of doing this ?
What about defining an rgb-mode property in the panel node.

There's .bpc in struct drm_display_info, I suspect that it could be used
for this. Alternatively, maybe we could extend the list of color formats
that go into drm_display_info.color_formats? RGB444 is already covered.

I forgot to ask about bpc meaning. If, as I think, it means "bits per
color" then it cannot be used to encode RGB565 where green color is
encoded on 6 bits and red and blue are encoded on 5 bits. 

Yes, I agree that bps is not a good fit for what you need here.

Thierry
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