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The keypad controller on NXP LPC32xx requires its clock gate to be open, therefore add description of the requires 'clocks' property. In addition adjust the example by adding description of required 'clocks' property and by fixing 'interrupts' property. Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
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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- clocks: phandle to clock controller plus clock-specifier pair
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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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clocks = <&clk LPC32XX_CLK_KEY>;
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interrupt-parent = <&sic1>;
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interrupts = <22 IRQ_TYPE_LEVEL_HIGH>;
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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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