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dt/misc: add bindings documentation for ifm camera sensor interface
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
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Sep 14, 2012
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IFM camera sensor interface on mpc5200 LocalPlus bus | ||
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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 | ||
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Optional properties: | ||
- ifm,csi-byte-swap: if this property is present, the byte swapping on | ||
the bus will be enabled. | ||
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Example: | ||
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csi@3,0 { | ||
compatible = "ifm,o2d-csi"; | ||
reg = <3 0 0x00100000>; /* CS 3, 1 MiB range */ | ||
interrupts = <1 1 2>; /* IRQ1, edge falling */ | ||
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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 */ | ||
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ifm,csi-addr-bus-width = <24>; | ||
ifm,csi-data-bus-width = <8>; | ||
ifm,csi-wait-cycles = <0>; | ||
}; | ||
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The base address of the used chip select is specified in the | ||
ranges property of the parent localbus node, for example: | ||
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ranges = <0 0 0xff000000 0x01000000 | ||
3 0 0xe3000000 0x00100000>; |