dt-bindings: simplefb-sunxi: Add sunxi simplefb extensions

If pre-filled framebuffer nodes are used, the firmware may need extra
properties to find the right node. This documents the properties to use
for this on sunxi platforms.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/Documentation/devicetree/bindings/video/simple-framebuffer-sunxi.txt b/Documentation/devicetree/bindings/video/simple-framebuffer-sunxi.txt
new file mode 100644 (file)
index 0000000..c46ba64
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+++ b/Documentation/devicetree/bindings/video/simple-framebuffer-sunxi.txt
@@ -0,0 +1,33 @@
+Sunxi specific Simple Framebuffer bindings
+
+This binding documents sunxi specific extensions to the simple-framebuffer
+bindings. The sunxi simplefb u-boot code relies on the devicetree containing
+pre-populated simplefb nodes.
+
+These extensions are intended so that u-boot can select the right node based
+on which pipeline is being used. As such they are solely intended for
+firmware / bootloader use, and the OS should ignore them.
+
+Required properties:
+- compatible: "allwinner,simple-framebuffer"
+- allwinner,pipeline, one of:
+  "de_be0-lcd0"
+  "de_be1-lcd1"
+  "de_be0-lcd0-hdmi"
+  "de_be1-lcd1-hdmi"
+
+Example:
+
+chosen {
+       #address-cells = <1>;
+       #size-cells = <1>;
+       ranges;
+
+       framebuffer@0 {
+               compatible = "allwinner,simple-framebuffer", "simple-framebuffer";
+               allwinner,pipeline = "de_be0-lcd0-hdmi";
+               clocks = <&pll5 1>, <&ahb_gates 36>, <&ahb_gates 43>,
+                        <&ahb_gates 44>;
+               status = "disabled";
+       };
+};