x86: Add initial video device init for Intel GMA
Intel's Graphics Media Accelerator (GMA) is a generic name for a wide range
of video devices. Add code to set up the hardware on ivybridge. Part of the
init happens in native code, part of it happens in a 16-bit option ROM for
those nostalgic for the 1970s.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/device-tree-bindings/video/intel-gma.txt b/doc/device-tree-bindings/video/intel-gma.txt
new file mode 100644
index 0000000..914be4f
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+++ b/doc/device-tree-bindings/video/intel-gma.txt
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+Intel GMA Bindings
+==================
+
+This is the Intel Graphics Media Accelerator. This binding supports selection
+of display parameters only.
+
+
+Required properties:
+ - compatible : "intel,gma";
+
+Optional properties:
+ - intel,dp-hotplug : values for digital port hotplug, one cell per value for
+ ports B, C and D
+ - intel,panel-port-select : output port to use: 0=LVDS 1=DP_B 2=DP_C 3=DP_D
+ - intel,panel-power-cycle-delay : T4 time sequence (6 = 500ms)
+
+ The following delays are in units of 0.1ms:
+ - intel,panel-power-up-delay : T1+T2 time sequence
+ - intel,panel-power-down-delay : T3 time sequence
+ - intel,panel-power-backlight-on-delay : T5 time sequence
+ - intel,panel-power-backlight-off-delay : Tx time sequence
+
+ - intel,cpu-backlight : Value for CPU Backlight PWM
+ - intel,pch-backlight : Value for PCH Backlight PWM
+
+Example
+-------
+
+gma {
+ compatible = "intel,gma";
+ intel,dp_hotplug = <0 0 0x06>;
+ intel,panel-port-select = <1>;
+ intel,panel-power-cycle-delay = <6>;
+ intel,panel-power-up-delay = <2000>;
+ intel,panel-power-down-delay = <500>;
+ intel,panel-power-backlight-on-delay = <2000>;
+ intel,panel-power-backlight-off-delay = <2000>;
+ intel,cpu-backlight = <0x00000200>;
+ intel,pch-backlight = <0x04000000>;
+};