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Input: add st-keyscan driver

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This patch adds ST Keyscan driver to use the keypad hw a subset of ST
boards provide. Specific board setup will be put in the given dt.

Signed-off-by: Gabriel Fernandez <[email protected]>
Signed-off-by: Giuseppe Condorelli <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
This commit is contained in:
Gabriel FERNANDEZ 2014-04-12 13:45:50 -07:00 • committed by Dmitry Torokhov
commit 062589b139
4 changed files with 346 additions and 0 deletions
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60
Documentation/devicetree/bindings/input/st-keyscan.txt Normal file
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* ST Keyscan controller Device Tree bindings
The ST keyscan controller Device Tree binding is based on the
matrix-keymap.
Required properties:
- compatible: "st,sti-keyscan"
- reg: Register base address and size of st-keyscan controller.
- interrupts: Interrupt number for the st-keyscan controller.
- clocks: Must contain one entry, for the module clock.
See ../clocks/clock-bindings.txt for details.
- pinctrl: Should specify pin control groups used for this controller.
See ../pinctrl/pinctrl-bindings.txt for details.
- linux,keymap: The keymap for keys as described in the binding document
devicetree/bindings/input/matrix-keymap.txt.
- keypad,num-rows: Number of row lines connected to the keypad controller.
- keypad,num-columns: Number of column lines connected to the keypad
controller.
Optional property:
- st,debounce_us: Debouncing interval time in microseconds
Example:
keyscan: keyscan@fe4b0000 {
compatible = "st,sti-keyscan";
reg = <0xfe4b0000 0x2000>;
interrupts = <GIC_SPI 212 IRQ_TYPE_NONE>;
clocks = <&CLK_SYSIN>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_keyscan>;
keypad,num-rows = <4>;
keypad,num-columns = <4>;
st,debounce_us = <5000>;
linux,keymap = < MATRIX_KEY(0x00, 0x00, KEY_F13)
MATRIX_KEY(0x00, 0x01, KEY_F9)
MATRIX_KEY(0x00, 0x02, KEY_F5)
MATRIX_KEY(0x00, 0x03, KEY_F1)
MATRIX_KEY(0x01, 0x00, KEY_F14)
MATRIX_KEY(0x01, 0x01, KEY_F10)
MATRIX_KEY(0x01, 0x02, KEY_F6)
MATRIX_KEY(0x01, 0x03, KEY_F2)
MATRIX_KEY(0x02, 0x00, KEY_F15)
MATRIX_KEY(0x02, 0x01, KEY_F11)
MATRIX_KEY(0x02, 0x02, KEY_F7)
MATRIX_KEY(0x02, 0x03, KEY_F3)
MATRIX_KEY(0x03, 0x00, KEY_F16)
MATRIX_KEY(0x03, 0x01, KEY_F12)
MATRIX_KEY(0x03, 0x02, KEY_F8)
MATRIX_KEY(0x03, 0x03, KEY_F4) >;
};