This patch adds DT bindings for command mode display timing.
Signed-off-by: YoungJun Cho <yj44.cho@xxxxxxxxxxx>
Acked-by: Inki Dae <inki.dae@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
.../bindings/video/cmdmode-display-timing.txt | 64 ++++++++++++++++++++
1 file changed, 64 insertions(+)
create mode 100644 Documentation/devicetree/bindings/video/cmdmode-display-timing.txt
diff --git a/Documentation/devicetree/bindings/video/cmdmode-display-timing.txt b/Documentation/devicetree/bindings/video/cmdmode-display-timing.txt
new file mode 100644
index 0000000..7cedfe4
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/cmdmode-display-timing.txt
@@ -0,0 +1,64 @@
+cmdmode-display-timing bindings
+===================================
+
+cmdmode-display-timings node
+--------------------------------
+
+required properties:
+ - none
+
+optional properties:
+ - native-mode: The native mode for the display, in case multiple modes are
+ provided. When omitted, assume the first node is the native.
+
+timing subnode
+--------------
+
+required properties:
+ - clock-frequency: display clock in Hz
+ - hactive, vactive: display resolution
+ - cs-setup: clock cycles for the active period of address signal is enabled
+ until chip select is enabled.
+ - wr-setup: clock cycles for the active period of CS signal is enabled until
+ write signal is enabled.
+ - wr-active: clock cycles for the active period of CS is enabled.
+ - wr-hold: clock cycles for the active period of CS is disabled until write
+ signal is disabled.
+
+optional properties:
+
+There are different ways of describing the capabilities of a display. The
+devicetree representation corresponds to the one commonly found in datasheets
+for displays. If a display supports multiple signal timings, the native-mode
+can be specified.
+
+The parameters are defined as:
+
+ VCLK(internal) __|¯¯¯¯¯¯|_____|¯¯¯¯¯¯|_____|¯¯¯¯¯¯|_____|¯¯¯¯¯¯|_____|¯¯
+ : : : : :
+ Address Output --:<XXXXXXXXXXX:XXXXXXXXXXXX:XXXXXXXXXXXX:XXXXXXXXXXXX:XX
+ | CS-SETUP+1 | : : :
+ |<---------->| : : :
+ Chip Select ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|____________:____________:____________|¯¯
+ | WR-SETUP+1 | | WR-HOLD+1 |
+ |<---------->| |<---------->|
+ Write Enable ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|____________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
+ | WR-ACTIVE+1|
+ |<---------->|
+ Video Data ----------------------------<XXXXXXXXXXXXXXXXXXXXXXXXX>--
+
+Example:
+
+ cmdmode-display-timings {
+ native-mode = <&timing0>;
+ timing0: 1080p24 {
+ /* 1920x1080p24 */
+ clock-frequency = <52000000>;
+ hactive = <1920>;
+ vactive = <1080>;
+ cs-setup = <0>;
+ wr-setup = <0>;
+ wr-active = <1>;
+ wr-hold = <0>;
+ };
+ };
--
1.7.9.5
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