Commit 2e7c04ae authored by Peter Rosin's avatar Peter Rosin Committed by Boris Brezillon

dt-bindings: display: atmel: optional video-interface of endpoints

With bus-type/bus-width properties in the endpoint nodes, the video-
interface of the connection can be specified for cases where the
heuristic fails to select the correct output mode. This can happen
e.g. if not all RGB pins are routed on the PCB; the driver has no
way of knowing this, and needs to be told explicitly.

This is critical for the devices that have the "conflicting output
formats" issue (SAM9N12, SAM9X5, SAMA5D3), since the most significant
RGB bits move around depending on the selected output mode. For
devices that do not have the "conflicting output formats" issue
(SAMA5D2, SAMA5D4), this is completely irrelevant.
Acked-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarJacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180825085620.10566-3-peda@axentia.se
parent 7473b9af
...@@ -15,6 +15,13 @@ Required children nodes: ...@@ -15,6 +15,13 @@ Required children nodes:
to external devices using the OF graph reprensentation (see ../graph.txt). to external devices using the OF graph reprensentation (see ../graph.txt).
At least one port node is required. At least one port node is required.
Optional properties in grandchild nodes:
Any endpoint grandchild node may specify a desired video interface
according to ../../media/video-interfaces.txt, specifically
- bus-width: recognized values are <12>, <16>, <18> and <24>, and
override any output mode selection heuristic, forcing "rgb444",
"rgb565", "rgb666" and "rgb888" respectively.
Example: Example:
hlcdc: hlcdc@f0030000 { hlcdc: hlcdc@f0030000 {
...@@ -50,3 +57,19 @@ Example: ...@@ -50,3 +57,19 @@ Example:
#pwm-cells = <3>; #pwm-cells = <3>;
}; };
}; };
Example 2: With a video interface override to force rgb565; as above
but with these changes/additions:
&hlcdc {
hlcdc-display-controller {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb565>;
port@0 {
hlcdc_panel_output: endpoint@0 {
bus-width = <16>;
};
};
};
};
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