panel/ld9040: add DT bindings

The patch adds bindings for ld9040 panel.
Bindings describe panel resources, boot delays,
display timings and physical size.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/Documentation/devicetree/bindings/panel/samsung,ld9040.txt b/Documentation/devicetree/bindings/panel/samsung,ld9040.txt
new file mode 100644 (file)
index 0000000..07c36c3
--- /dev/null
+++ b/Documentation/devicetree/bindings/panel/samsung,ld9040.txt
@@ -0,0 +1,66 @@
+Samsung LD9040 AMOLED LCD parallel RGB panel with SPI control bus
+
+Required properties:
+  - compatible: "samsung,ld9040"
+  - reg: address of the panel on SPI bus
+  - vdd3-supply: core voltage supply
+  - vci-supply: voltage supply for analog circuits
+  - reset-gpios: a GPIO spec for the reset pin
+  - display-timings: timings for the connected panel according to [1]
+
+The panel must obey rules for SPI slave device specified in document [2].
+
+Optional properties:
+  - power-on-delay: delay after turning regulators on [ms]
+  - reset-delay: delay after reset sequence [ms]
+  - panel-width-mm: physical panel width [mm]
+  - panel-height-mm: physical panel height [mm]
+
+The device node can contain one 'port' child node with one child
+'endpoint' node, according to the bindings defined in [3]. This
+node should describe panel's video bus.
+
+[1]: Documentation/devicetree/bindings/video/display-timing.txt
+[2]: Documentation/devicetree/bindings/spi/spi-bus.txt
+[3]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+       lcd@0 {
+               compatible = "samsung,ld9040";
+               reg = <0>;
+               vdd3-supply = <&ldo7_reg>;
+               vci-supply = <&ldo17_reg>;
+               reset-gpios = <&gpy4 5 0>;
+               spi-max-frequency = <1200000>;
+               spi-cpol;
+               spi-cpha;
+               power-on-delay = <10>;
+               reset-delay = <10>;
+               panel-width-mm = <90>;
+               panel-height-mm = <154>;
+
+               display-timings {
+                       timing {
+                               clock-frequency = <23492370>;
+                               hactive = <480>;
+                               vactive = <800>;
+                               hback-porch = <16>;
+                               hfront-porch = <16>;
+                               vback-porch = <2>;
+                               vfront-porch = <28>;
+                               hsync-len = <2>;
+                               vsync-len = <1>;
+                               hsync-active = <0>;
+                               vsync-active = <0>;
+                               de-active = <0>;
+                               pixelclk-active = <0>;
+                       };
+               };
+
+               port {
+                       lcd_ep: endpoint {
+                               remote-endpoint = <&fimd_dpi_ep>;
+                       };
+               };
+       };