exynos4-is: Add clock provider for the external clocks

This patch adds clock provider to expose the sclk_cam0/1 clocks
for image sensor subdevs.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
Changes since v2:
- embed #clocks-property into 'camera' node rather than creating
  separate subnode for the clock provider, edited the binding's
  documentation.

1 files changed, 12 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/media/samsung-fimc.txt b/Documentation/devicetree/bindings/media/samsung-fimc.txt
index 96312f6c4c2..137d5407f6f 100644
--- a/Documentation/devicetree/bindings/media/samsung-fimc.txt
+++ b/Documentation/devicetree/bindings/media/samsung-fimc.txt
@@ -32,6 +32,15 @@ way around.
 
 The 'camera' node must include at least one 'fimc' child node.
 
+Optional properties:
+
+- #clock-cells: from the common clock bindings (../clock/clock-bindings.txt),
+  must be 1. A clock provider is associated with the camera node and it should
+  be referenced by external sensors that use clocks provided by the SoC on
+  CAM_*_CLKOUT pins. The second cell of the clock specifier is a clock's index.
+  The indexes are 0, 1 for CAM_A_CLKOUT, CAM_B_CLKOUT clocks respectively.
+
+
 'fimc' device nodes
 -------------------
 
@@ -114,7 +123,7 @@ Example:
 			vddio-supply = <...>;
 
 			clock-frequency = <24000000>;
-			clocks = <...>;
+			clocks = <&camclk 1>;
 			clock-names = "mclk";
 
 			port {
@@ -135,7 +144,7 @@ Example:
 			vddio-supply = <...>;
 
 			clock-frequency = <24000000>;
-			clocks = <...>;
+			clocks = <&camclk 0>;
 			clock-names = "mclk";
 
 			port {
@@ -151,8 +160,8 @@ Example:
 		compatible = "samsung,fimc", "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
+		#clock-cells = <1>;
 		status = "okay";
-
 		pinctrl-names = "default";
 		pinctrl-0 = <&cam_port_a_clk_active>;