This patch documents following updates of the Exynos4 SoC camera subsystem
devicetree binding:
- addition of #clock-cells and clock-output-names properties to 'camera'
node - these are now needed so the image sensor sub-devices can reference
clocks provided by the camera host interface,
- dropped a note about required clock-frequency properties at the
image sensor nodes; the sensor devices can now control their clock
explicitly through the clk API and there is no need to require this
property in the camera host interface binding.
Signed-off-by: Sylwester Nawrocki <s.nawro...@samsung.com>
---
Resending only single patch which changed.
Changes since v6:
- #clock-cells, clock-output-names documented as mandatory properties;
- renamed "cam_mclk_{a,b}" to "cam_{a,b}_clkout in the example dts,
this now matches changes in exynos4.dtsi further in the patch series;
- marked "samsung,camclk-out" property as deprecated.
Changes since v5:
- none.
Changes since v4:
- dropped a requirement of specific order of values in clocks/
clock-names properties (Mark) and reference to clock-names in
clock-output-names property description (Mark).
---
.../devicetree/bindings/media/samsung-fimc.txt | 46 +++++++++++++-------
1 file changed, 31 insertions(+), 15 deletions(-)
diff --git a/Documentation/devicetree/bindings/media/samsung-fimc.txt
b/Documentation/devicetree/bindings/media/samsung-fimc.txt
index 96312f6..1908a5f 100644
--- a/Documentation/devicetree/bindings/media/samsung-fimc.txt
+++ b/Documentation/devicetree/bindings/media/samsung-fimc.txt
@@ -15,11 +15,21 @@ Common 'camera' node
Required properties:
-- compatible : must be "samsung,fimc", "simple-bus"
-- clocks : list of clock specifiers, corresponding to entries in
- the clock-names property;
-- clock-names : must contain "sclk_cam0", "sclk_cam1", "pxl_async0",
- "pxl_async1" entries, matching entries in the clocks property.
+- compatible: must be "samsung,fimc", "simple-bus"
+- clocks: list of clock specifiers, corresponding to entries in
+ the clock-names property;
+- clock-names : must contain "sclk_cam0", "sclk_cam1", "pxl_async0",
+ "pxl_async1" entries, matching entries in the clocks property.
+
+- #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 clock specifier cell stores an index of a clock.
+ The indices are 0, 1 for CAM_A_CLKOUT, CAM_B_CLKOUT clocks respectively.
+
+- clock-output-names: from the common clock bindings, should contain names of
+ clocks registered by the camera subsystem corresponding to CAM_A_CLKOUT,
+ CAM_B_CLKOUT output clocks respectively.
The pinctrl bindings defined in ../pinctrl/pinctrl-bindings.txt must be used
to define a required pinctrl state named "default" and optional pinctrl states:
@@ -32,6 +42,7 @@ way around.
The 'camera' node must include at least one 'fimc' child node.
+
'fimc' device nodes
-------------------
@@ -88,8 +99,8 @@ port nodes specifies data input - 0, 1 indicates input A, B
respectively.
Optional properties
-- samsung,camclk-out : specifies clock output for remote sensor,
- 0 - CAM_A_CLKOUT, 1 - CAM_B_CLKOUT;
+- samsung,camclk-out (deprecated) : specifies clock output for remote sensor,
+ 0 - CAM_A_CLKOUT, 1 - CAM_B_CLKOUT;
Image sensor nodes
------------------
@@ -97,8 +108,8 @@ Image sensor nodes
The sensor device nodes should be added to their control bus controller (e.g.
I2C0) nodes and linked to a port node in the csis or the parallel-ports node,
using the common video interfaces bindings, defined in video-interfaces.txt.
-The implementation of this bindings requires clock-frequency property to be
-present in the sensor device nodes.
+An optional clock-frequency property needs to be present in the sensor device
+nodes. Default value when this property is not present is 24 MHz.
Example:
@@ -114,7 +125,7 @@ Example:
vddio-supply = <...>;
clock-frequency = <24000000>;
- clocks = <...>;
+ clocks = <&camera 1>;
clock-names = "mclk";
port {
@@ -135,7 +146,7 @@ Example:
vddio-supply = <...>;
clock-frequency = <24000000>;
- clocks = <...>;
+ clocks = <&camera 0>;
clock-names = "mclk";
port {
@@ -149,12 +160,17 @@ Example:
camera {
compatible = "samsung,fimc", "simple-bus";
- #address-cells = <1>;
- #size-cells = <1>;
- status = "okay";
-
+ clocks = <&clock 132>, <&clock 133>, <&clock 351>,
+ <&clock 352>;
+ clock-names = "sclk_cam0", "sclk_cam1", "pxl_async0",
+ "pxl_async1";
+ #clock-cells = <1>;
+ clock-output-names = "cam_a_clkout", "cam_b_clkout";
pinctrl-names = "default";
pinctrl-0 = <&cam_port_a_clk_active>;
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <1>;
/* parallel camera ports */
parallel-ports {
--
1.7.9.5
--
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