[PATCH v4 2/2] dt-bindings: Document the Rockchip RK1608 bindings

[Wen Nuan <leo.wen@rock-chips.com>]

From: Leo Wen <leo.wen@rock-chips.com>

Add DT bindings documentation for Rockchip RK1608.

Changes V4:
- Revise the comment of node.
- Revise the comment of 'endpoint@1'.

Signed-off-by: Leo Wen <leo.wen@rock-chips.com>
---
 Documentation/devicetree/bindings/media/rk1608.txt | 95 ++++++++++++++++++++++
 MAINTAINERS                                        |  1 +
 2 files changed, 96 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/rk1608.txt

diff --git a/Documentation/devicetree/bindings/media/rk1608.txt b/Documentation/devicetree/bindings/media/rk1608.txt
new file mode 100644
index 0000000..ea23d2d
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/rk1608.txt
@@ -0,0 +1,95 @@
+Rockchip RK1608 as a PreISP to link on Soc
+------------------------------------------
+
+Required properties:
+
+- compatible		: "rockchip,rk1608";
+- reg			: SPI slave address of the rk1608;
+- clocks		: Must contain an entry for each entry in clock-names;
+- clock-names		: Must contain "mclk" for the device's master clock;
+- reset-gpios		: GPIO connected to reset pin;
+- irq-gpios		: GPIO connected to irq pin;
+- sleepst-gpios		: GPIO connected to sleepst pin;
+- wakeup-gpios		: GPIO connected to wakeup pin;
+- powerdown-gpios	: GPIO connected to powerdown pin;
+- pinctrl-names		: Should contain only one value - "default";
+- pinctrl-0		: Pin control group to be used for this controller;
+
+Optional properties:
+
+- spi-max-frequency	: Maximum SPI clocking speed of the device;
+
+The device node should contain one or two port child nodes with child
+'endpoint' node. There are two ports then port@0 must
+describe the output and port@1 input channels. Please refer to the
+bindings defined in
+Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+endpoint node
+-------------
+
+- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
+	       video-interfaces.txt. If present it should be <1> - the device
+	       supports only one data lane without re-mapping.
+
+Note1: Since no data is generated in RK1608，so this is meaningful that you need
+a extra sensor (such as a camera) mounted on RK1608. You need to use endpoint@x
+to match these sensors.
+
+Note2:You must set the current value of the spi pins to be 8mA, if they are not.
+
+Example:
+&spi0 {
+	status = "okay";
+	spi_rk1608@00 {
+		compatible =  "rockchip,rk1608";
+		status = "okay";
+		reg = <0>;
+		spi-max-frequency = <24000000>;
+		link-freqs = /bits/ 64 <LINK_FREQ>;
+		clocks = <&cru SCLK_SPI0>, <&cru SCLK_VIP_OUT>,
+		<&cru DCLK_VOP0>, <&cru ACLK_VIP>, <&cru HCLK_VIP>,
+		<&cru PCLK_ISP_IN>, <&cru PCLK_ISP_IN>,
+		<&cru PCLK_ISP_IN>, <&cru SCLK_MIPIDSI_24M>,
+		<&cru PCLK_MIPI_CSI>;
+		clock-names = "mclk", "mipi_clk",  "pd_cif", "aclk_cif",
+			"hclk_cif", "cif0_in", "g_pclkin_cif",
+			"cif0_out", "clk_mipi_24m", "hclk_mipiphy";
+		reset-gpios = <&gpio6 0 GPIO_ACTIVE_HIGH>;
+		irq-gpios = <&gpio6 2 GPIO_ACTIVE_HIGH>;
+		sleepst-gpios = <&gpio6 1 GPIO_ACTIVE_HIGH>;
+		wakeup-gpios = <&gpio6 4 GPIO_ACTIVE_HIGH>;
+		powerdown-gpios = <&gpio8 0 GPIO_ACTIVE_HIGH>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&rk1608_irq_gpios &rk1608_wake_gpios
+			     &rk1608_sleep_gpios>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			port@0 {
+				mipi_dphy_out0: endpoint@0 {
+					remote-endpoint = <&mipi_dphy_in0>;
+					clock-lanes = <0>;
+					data-lanes = <1 2 3 4>;
+					clock-noncontinuous;
+					link-frequencies =
+						/bits/ 64 <LINK_FREQ>;
+				};
+			};
+
+			port@1 {
+				sensor_in0: endpoint@0 {
+					remote-endpoint = <&sensor_out0>;
+				};
+				/* If you have a second sensor,
+				 * add the 'endpoint@1' node here.
+				 */
+				sensor_in1: endpoint@1 {
+					remote-endpoint = <&sensor_out1>;
+				};
+			};
+		};
+	};
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index b2a98e3..04d227b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -141,6 +141,7 @@ M:	Leo Wen <leo.wen@rock-chips.com>
 S:	Maintained
 F:	drivers/media/spi/rk1608.c
 F:	drivers/media/spi/rk1608.h
+F:	Documentation/devicetree/bindings/media/rk1608.txt
 
 3C59X NETWORK DRIVER
 M:	Steffen Klassert <klassert@mathematik.tu-chemnitz.de>
-- 
2.7.4