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dt/misc: add bindings documentation for ifm camera sensor interface
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IFM O2D cameras use special sensor bus interface glue-logic to
connect camera sensors to mpc5200 LocalPlus bus. Add device tree
bindings documentation for it.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
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Anatolij Gustschin committed Sep 14, 2012
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41 changes: 41 additions & 0 deletions Documentation/devicetree/bindings/misc/ifm-csi.txt
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IFM camera sensor interface on mpc5200 LocalPlus bus

Required properties:
- compatible: "ifm,o2d-csi"
- reg: specifies sensor chip select number and associated address range
- interrupts: external interrupt line number and interrupt sense mode
of the interrupt line signaling frame valid events
- gpios: three gpio-specifiers for "capture", "reset" and "master enable"
GPIOs (strictly in this order).
- ifm,csi-clk-handle: the phandle to a node in the DT describing the sensor
clock generator. This node is usually a general purpose timer controller.
- ifm,csi-addr-bus-width: address bus width (valid values are 16, 24, 25)
- ifm,csi-data-bus-width: data bus width (valid values are 8 and 16)
- ifm,csi-wait-cycles: sensor bus wait cycles

Optional properties:
- ifm,csi-byte-swap: if this property is present, the byte swapping on
the bus will be enabled.

Example:

csi@3,0 {
compatible = "ifm,o2d-csi";
reg = <3 0 0x00100000>; /* CS 3, 1 MiB range */
interrupts = <1 1 2>; /* IRQ1, edge falling */

ifm,csi-clk-handle = <&timer7>;
gpios = <&gpio_simple 23 0 /* image_capture */
&gpio_simple 26 0 /* image_reset */
&gpio_simple 29 0>; /* image_master_en */

ifm,csi-addr-bus-width = <24>;
ifm,csi-data-bus-width = <8>;
ifm,csi-wait-cycles = <0>;
};

The base address of the used chip select is specified in the
ranges property of the parent localbus node, for example:

ranges = <0 0 0xff000000 0x01000000
3 0 0xe3000000 0x00100000>;

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