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[media] Documentation: devicetree: Update Samsung FIMC DT binding

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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.nawrocki@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Sylwester Nawrocki 2013-12-20 18:56:05 -03:00 committed by Mauro Carvalho Chehab
parent ae704bc3bd
commit 53f8a899a3
1 changed files with 29 additions and 15 deletions
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44
Documentation/devicetree/bindings/media/samsung-fimc.txt
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@ -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 +108,6 @@ 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.
Example:
@ -114,7 +123,7 @@ Example:
vddio-supply = <...>;
clock-frequency = <24000000>;
clocks = <...>;
clocks = <&camera 1>;
clock-names = "mclk";
port {
@ -135,7 +144,7 @@ Example:
vddio-supply = <...>;
clock-frequency = <24000000>;
clocks = <...>;
clocks = <&camera 0>;
clock-names = "mclk";
port {
@ -149,12 +158,17 @@ 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 {