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kernel
os
linux
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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Documentation/devicetree/bindings/misc/ifm-csi.txt
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Documentation/devicetree/bindings/misc/ifm-csi.txt
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IFM camera sensor interface on mpc5200 LocalPlus bus
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Required properties:
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- compatible: "ifm,o2d-csi"
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- reg: specifies sensor chip select number and associated address range
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- interrupts: external interrupt line number and interrupt sense mode
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of the interrupt line signaling frame valid events
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- gpios: three gpio-specifiers for "capture", "reset" and "master enable"
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GPIOs (strictly in this order).
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- ifm,csi-clk-handle: the phandle to a node in the DT describing the sensor
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clock generator. This node is usually a general purpose timer controller.
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- ifm,csi-addr-bus-width: address bus width (valid values are 16, 24, 25)
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- ifm,csi-data-bus-width: data bus width (valid values are 8 and 16)
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- ifm,csi-wait-cycles: sensor bus wait cycles
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Optional properties:
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- ifm,csi-byte-swap: if this property is present, the byte swapping on
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the bus will be enabled.
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Example:
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csi@3,0 {
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compatible = "ifm,o2d-csi";
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reg = <3 0 0x00100000>; /* CS 3, 1 MiB range */
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interrupts = <1 1 2>; /* IRQ1, edge falling */
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ifm,csi-clk-handle = <&timer7>;
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gpios = <&gpio_simple 23 0 /* image_capture */
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&gpio_simple 26 0 /* image_reset */
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&gpio_simple 29 0>; /* image_master_en */
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ifm,csi-addr-bus-width = <24>;
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ifm,csi-data-bus-width = <8>;
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ifm,csi-wait-cycles = <0>;
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};
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The base address of the used chip select is specified in the
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ranges property of the parent localbus node, for example:
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ranges = <0 0 0xff000000 0x01000000
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3 0 0xe3000000 0x00100000>;