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[media] atmel-isi: update device tree bindings documentation

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The original bindings documentation was incomplete (missing pinctrl-names,
missing endpoint node properties) and the example was out of date.

Add the missing information and tidy up the text.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2016-12-12 11:11:35 -02:00 committed by Mauro Carvalho Chehab
parent a0c4164e0e
commit e48f4eeac1
1 changed files with 51 additions and 36 deletions
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87
Documentation/devicetree/bindings/media/atmel-isi.txt
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@ -1,51 +1,66 @@
Atmel Image Sensor Interface (ISI) SoC Camera Subsystem
----------------------------------------------
Atmel Image Sensor Interface (ISI)
----------------------------------
Required properties:
- compatible: must be "atmel,at91sam9g45-isi"
- reg: physical base address and length of the registers set for the device;
- interrupts: should contain IRQ line for the ISI;
- clocks: list of clock specifiers, corresponding to entries in
the clock-names property;
- clock-names: must contain "isi_clk", which is the isi peripherial clock.
Required properties for ISI:
- compatible: must be "atmel,at91sam9g45-isi".
- reg: physical base address and length of the registers set for the device.
- interrupts: should contain IRQ line for the ISI.
- clocks: list of clock specifiers, corresponding to entries in the clock-names
property; please refer to clock-bindings.txt.
- clock-names: required elements: "isi_clk".
- pinctrl-names, pinctrl-0: please refer to pinctrl-bindings.txt.
ISI supports a single port node with parallel bus. It should contain one
ISI supports a single port node with parallel bus. It shall contain one
'port' child node with child 'endpoint' node. Please refer to the bindings
defined in Documentation/devicetree/bindings/media/video-interfaces.txt.
Endpoint node properties
------------------------
- bus-width: <8> or <10> (mandatory)
- hsync-active (default: active high)
- vsync-active (default: active high)
- pclk-sample (default: sample on falling edge)
- remote-endpoint: A phandle to the bus receiver's endpoint node (mandatory).
Example:
isi: isi@f0034000 {
compatible = "atmel,at91sam9g45-isi";
reg = <0xf0034000 0x4000>;
interrupts = <37 IRQ_TYPE_LEVEL_HIGH 5>;
clocks = <&isi_clk>;
clock-names = "isi_clk";
isi: isi@f0034000 {
compatible = "atmel,at91sam9g45-isi";
reg = <0xf0034000 0x4000>;
interrupts = <37 IRQ_TYPE_LEVEL_HIGH 5>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_isi_data_0_7>;
clocks = <&isi_clk>;
clock-names = "isi_clk";
port {
isi_0: endpoint {
remote-endpoint = <&ov2640_0>;
bus-width = <8>;
vsync-active = <1>;
hsync-active = <1>;
};
};
};
i2c1: i2c@f0018000 {
ov2640: camera@30 {
compatible = "ovti,ov2640";
reg = <0x30>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_isi>;
pinctrl-0 = <&pinctrl_pck0_as_isi_mck &pinctrl_sensor_power &pinctrl_sensor_reset>;
resetb-gpios = <&pioE 11 GPIO_ACTIVE_LOW>;
pwdn-gpios = <&pioE 13 GPIO_ACTIVE_HIGH>;
clocks = <&pck0>;
clock-names = "xvclk";
assigned-clocks = <&pck0>;
assigned-clock-rates = <25000000>;
port {
#address-cells = <1>;
#size-cells = <0>;
isi_0: endpoint {
remote-endpoint = <&ov2640_0>;
ov2640_0: endpoint {
remote-endpoint = <&isi_0>;
bus-width = <8>;
};
};
};
i2c1: i2c@f0018000 {
ov2640: camera@0x30 {
compatible = "ovti,ov2640";
reg = <0x30>;
port {
ov2640_0: endpoint {
remote-endpoint = <&isi_0>;
bus-width = <8>;
};
};
};
};
};