* Tegra keyboard controller
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The key controller has maximum 24 pins to make matrix keypad. Any pin
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can be configured as row or column. The maximum column pin can be 8
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and maximum row pins can be 16 for Tegra20/Tegra30.
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Required properties:
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- compatible: "nvidia,tegra20-kbc"
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- reg: Register base address of KBC.
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- interrupts: Interrupt number for the KBC.
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- nvidia,kbc-row-pins: The KBC pins which are configured as row. This is an
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array of pin numbers which is used as rows.
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- nvidia,kbc-col-pins: The KBC pins which are configured as column. This is an
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array of pin numbers which is used as column.
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- linux,keymap: The keymap for keys as described in the binding document
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devicetree/bindings/input/matrix-keymap.txt.
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- clocks: Must contain one entry, for the module clock.
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See ../clocks/clock-bindings.txt for details.
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- resets: Must contain an entry for each entry in reset-names.
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See ../reset/reset.txt for details.
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- reset-names: Must include the following entries:
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- kbc
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Optional properties, in addition to those specified by the shared
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matrix-keyboard bindings:
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- linux,fn-keymap: a second keymap, same specification as the
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matrix-keyboard-controller spec but to be used when the KEY_FN modifier
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key is pressed.
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- nvidia,debounce-delay-ms: delay in milliseconds per row scan for debouncing
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- nvidia,repeat-delay-ms: delay in milliseconds before repeat starts
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- nvidia,ghost-filter: enable ghost filtering for this device
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- wakeup-source: configure keyboard as a wakeup source for suspend/resume
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(Legacy property supported: "nvidia,wakeup-source")
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Example:
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keyboard: keyboard {
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compatible = "nvidia,tegra20-kbc";
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reg = <0x7000e200 0x100>;
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interrupts = <0 85 0x04>;
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clocks = <&tegra_car 36>;
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resets = <&tegra_car 36>;
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reset-names = "kbc";
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nvidia,ghost-filter;
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nvidia,debounce-delay-ms = <640>;
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nvidia,kbc-row-pins = <0 1 2>; /* pin 0, 1, 2 as rows */
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nvidia,kbc-col-pins = <11 12 13>; /* pin 11, 12, 13 as columns */
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linux,keymap = <0x00000074
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0x00010067
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0x00020066
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0x01010068
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0x02000069
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0x02010070
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0x02020071>;
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};
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