Re: [PATCH V3 2/2] video: drm: exynos: Add device tree support

Add device tree based discovery support for DRM-FIMD driver.

Signed-off-by: Leela Krishna Amudala <redacted>
---
 Documentation/devicetree/bindings/fb/drm-fimd.txt |   80 +++++++++++++++++
 drivers/gpu/drm/exynos/exynos_drm_fimd.c          |   95 ++++++++++++++++++++-
 2 files changed, 173 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/fb/drm-fimd.txt

diff --git a/Documentation/devicetree/bindings/fb/drm-fimd.txt b/Documentation/devicetree/bindings/fb/drm-fimd.txt
new file mode 100644
index 0000000..8ad8814
--- /dev/null
+++ b/Documentation/devicetree/bindings/fb/drm-fimd.txt

@@ -0,0 +1,80 @@
+* Samsung Display Controller using DRM frame work
+
+The display controller is used to transfer image data from memory to an
+external LCD driver interface. It supports various color formats such as
+rgb and yuv.
+
+Required properties:
+ - compatible: Should be "samsung,exynos5-drm" for fimd using DRM frame work.
+ - reg: physical base address of the controller and length of memory
+   mapped region.
+ - interrupts: Three interrupts should be specified. The interrupts should be
+   specified in the following order.
+   - VSYNC interrupt
+   - FIFO level interrupt
+   - FIMD System Interrupt
+
+ - samsung,fimd-display: This property should specify the phandle of the
+   display device node which holds the video interface timing with the
+   below mentioned properties.
+
+   - lcd-htiming: Specifies the horizontal timing for the overlay. The
+     horizontal timing includes four parameters in the following order.
+
+     - horizontal back porch (in number of lcd clocks)
+     - horizontal front porch (in number of lcd clocks)
+     - hsync pulse width (in number of lcd clocks)
+     - Display panels X resolution.
+
+   - lcd-vtiming: Specifies the vertical timing for the overlay. The
+     vertical timing includes four parameters in the following order.
+
+     - vertical back porch (in number of lcd lines)
+     - vertical front porch (in number of lcd lines)
+     - vsync pulse width (in number of lcd clocks)
+     - Display panels Y resolution.