forked from Minki/linux
1d260123cb
Simply document new compatibility string. As a previous patch adds a generic R-Car Gen2 compatibility string there appears to be no need for a driver updates. By documenting this compat string it may be used in DTSs shipped, for example as part of ROMs. It must be used in conjunction with the Gen2 fallback compat string. At this time there are no known differences between the r8a7792 IP block and that implemented by the driver for the Gen2 fallback compat string. Thus there is no need to update the driver as the use of the Gen2 fallback compat string will activate the correct code in the current driver while leaving the option for r8a7792-specific driver code to be activated in an updated driver should the need arise. Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
98 lines
2.9 KiB
Plaintext
98 lines
2.9 KiB
Plaintext
Renesas RCar Video Input driver (rcar_vin)
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------------------------------------------
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The rcar_vin device provides video input capabilities for the Renesas R-Car
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family of devices. The current blocks are always slaves and suppot one input
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channel which can be either RGB, YUYV or BT656.
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- compatible: Must be one or more of the following
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- "renesas,vin-r8a7795" for the R8A7795 device
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- "renesas,vin-r8a7794" for the R8A7794 device
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- "renesas,vin-r8a7793" for the R8A7793 device
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- "renesas,vin-r8a7792" for the R8A7792 device
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- "renesas,vin-r8a7791" for the R8A7791 device
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- "renesas,vin-r8a7790" for the R8A7790 device
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- "renesas,vin-r8a7779" for the R8A7779 device
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- "renesas,vin-r8a7778" for the R8A7778 device
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- "renesas,rcar-gen2-vin" for a generic R-Car Gen2 compatible device.
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- "renesas,rcar-gen3-vin" for a generic R-Car Gen3 compatible device.
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When compatible with the generic version nodes must list the
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SoC-specific version corresponding to the platform first
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followed by the generic version.
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- reg: the register base and size for the device registers
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- interrupts: the interrupt for the device
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- clocks: Reference to the parent clock
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Additionally, an alias named vinX will need to be created to specify
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which video input device this is.
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The per-board settings:
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- port sub-node describing a single endpoint connected to the vin
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as described in video-interfaces.txt[1]. Only the first one will
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be considered as each vin interface has one input port.
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These settings are used to work out video input format and widths
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into the system.
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Device node example
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-------------------
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aliases {
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vin0 = &vin0;
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};
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vin0: vin@0xe6ef0000 {
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compatible = "renesas,vin-r8a7790", "renesas,rcar-gen2-vin";
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clocks = <&mstp8_clks R8A7790_CLK_VIN0>;
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reg = <0 0xe6ef0000 0 0x1000>;
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interrupts = <0 188 IRQ_TYPE_LEVEL_HIGH>;
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status = "disabled";
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};
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Board setup example (vin1 composite video input)
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------------------------------------------------
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&i2c2 {
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status = "ok";
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pinctrl-0 = <&i2c2_pins>;
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pinctrl-names = "default";
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adv7180@20 {
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compatible = "adi,adv7180";
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reg = <0x20>;
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remote = <&vin1>;
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port {
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adv7180: endpoint {
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bus-width = <8>;
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remote-endpoint = <&vin1ep0>;
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};
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};
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};
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};
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/* composite video input */
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&vin1 {
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pinctrl-0 = <&vin1_pins>;
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pinctrl-names = "default";
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status = "ok";
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port {
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#address-cells = <1>;
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#size-cells = <0>;
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vin1ep0: endpoint {
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remote-endpoint = <&adv7180>;
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bus-width = <8>;
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};
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};
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};
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[1] video-interfaces.txt common video media interface
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