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1d0b1c74ed
Some matrix keypad drivers can support different numbers of rows and columns. Add a generic binding for these. Implementation note: In order to implement this binding in the kernel, we will need to modify matrix_keypad_() to look up the number of rows and cols in the keymap. Perhaps this could be done by passing 0 for these parameters? Many of the parameters can already be set to NULL. Ick. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
32 lines
936 B
Plaintext
32 lines
936 B
Plaintext
NXP LPC32xx Key Scan Interface
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This binding is based on the matrix-keymap binding with the following
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changes:
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Required Properties:
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- compatible: Should be "nxp,lpc3220-key"
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- reg: Physical base address of the controller and length of memory mapped
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region.
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- interrupts: The interrupt number to the cpu.
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- nxp,debounce-delay-ms: Debounce delay in ms
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- nxp,scan-delay-ms: Repeated scan period in ms
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- linux,keymap: the key-code to be reported when the key is pressed
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and released, see also
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Documentation/devicetree/bindings/input/matrix-keymap.txt
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Note: keypad,num-rows and keypad,num-columns are required, and must be equal
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since LPC32xx only supports square matrices
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Example:
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key@40050000 {
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compatible = "nxp,lpc3220-key";
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reg = <0x40050000 0x1000>;
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interrupts = <54 0>;
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keypad,num-rows = <1>;
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keypad,num-columns = <1>;
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nxp,debounce-delay-ms = <3>;
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nxp,scan-delay-ms = <34>;
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linux,keymap = <0x00000002>;
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};
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