This patch adds DT bindings for command mode display timing.
Signed-off-by: YoungJun Cho yj44.cho@samsung.com Acked-by: Inki Dae inki.dae@samsung.com Acked-by: Kyungmin Park kyungmin.park@samsung.com --- .../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>; + }; + };