exynos/dsim: add DT bindings

The patch adds DT bindings for Exynos DSI Master. DSIM follows rules
for DSI bus host bindings [1].
Properties describes its resources: memory, interrupt, clocks,
phy, regulators, frequencies of clocks and video interfaces.

[1]: Documentation/devicetree/bindings/mipi/dsi/mipi-dsi-bus.txt

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

diff --git a/Documentation/devicetree/bindings/video/exynos_dsim.txt b/Documentation/devicetree/bindings/video/exynos_dsim.txt
new file mode 100644 (file)
index 0000000..33b5730
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+++ b/Documentation/devicetree/bindings/video/exynos_dsim.txt
@@ -0,0 +1,80 @@
+Exynos MIPI DSI Master
+
+Required properties:
+  - compatible: "samsung,exynos4210-mipi-dsi"
+  - reg: physical base address and length of the registers set for the device
+  - interrupts: should contain DSI interrupt
+  - clocks: list of clock specifiers, must contain an entry for each required
+    entry in clock-names
+  - clock-names: should include "bus_clk"and "pll_clk" entries
+  - phys: list of phy specifiers, must contain an entry for each required
+    entry in phy-names
+  - phy-names: should include "dsim" entry
+  - vddcore-supply: MIPI DSIM Core voltage supply (e.g. 1.1V)
+  - vddio-supply: MIPI DSIM I/O and PLL voltage supply (e.g. 1.8V)
+  - samsung,pll-clock-frequency: specifies frequency of the "pll_clk" clock
+  - #address-cells, #size-cells: should be set respectively to <1> and <0>
+    according to DSI host bindings (see MIPI DSI bindings [1])
+
+Optional properties:
+  - samsung,power-domain: a phandle to DSIM power domain node
+
+Child nodes:
+  Should contain DSI peripheral nodes (see MIPI DSI bindings [1]).
+
+Video interfaces:
+  Device node can contain video interface port nodes according to [2].
+  The following are properties specific to those nodes:
+
+  port node:
+    - reg: (required) can be 0 for input RGB/I80 port or 1 for DSI port;
+
+  endpoint node of DSI port (reg = 1):
+    - samsung,burst-clock-frequency: specifies DSI frequency in high-speed burst
+      mode
+    - samsung,esc-clock-frequency: specifies DSI frequency in escape mode
+
+[1]: Documentation/devicetree/bindings/mipi/dsi/mipi-dsi-bus.txt
+[2]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+       dsi@11C80000 {
+               compatible = "samsung,exynos4210-mipi-dsi";
+               reg = <0x11C80000 0x10000>;
+               interrupts = <0 79 0>;
+               clocks = <&clock 286>, <&clock 143>;
+               clock-names = "bus_clk", "pll_clk";
+               phys = <&mipi_phy 1>;
+               phy-names = "dsim";
+               vddcore-supply = <&vusb_reg>;
+               vddio-supply = <&vmipi_reg>;
+               samsung,power-domain = <&pd_lcd0>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+               samsung,pll-clock-frequency = <24000000>;
+
+               panel@1 {
+                       reg = <0>;
+                       ...
+                       port {
+                               panel_ep: endpoint {
+                                       remote-endpoint = <&dsi_ep>;
+                               };
+                       };
+               };
+
+               ports {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       port@1 {
+                               dsi_ep: endpoint {
+                                       reg = <0>;
+                                       samsung,burst-clock-frequency = <500000000>;
+                                       samsung,esc-clock-frequency = <20000000>;
+                                       remote-endpoint = <&panel_ep>;
+                               };
+                       };
+               };
+       };