Input: pinephone-keyboard - add PinePhone keyboard driver

The official Pine64 PinePhone keyboard case contains a matrix keypad and
a MCU which runs a libre firmware. Add support for its I2C interface.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20220618165747.55709-3-samuel@sholland.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: smaeul

MAINTAINERS

@@ -16186,6 +16186,12 @@ F:	Documentation/devicetree/bindings/pinctrl/sunplus,*
 F:	drivers/pinctrl/sunplus/
 F:	include/dt-bindings/pinctrl/sppctl*.h
 
+PINE64 PINEPHONE KEYBOARD DRIVER
+M:	Samuel Holland <samuel@sholland.org>
+S:	Supported
+F:	Documentation/devicetree/bindings/input/pine64,pinephone-keyboard.yaml
+F:	drivers/input/keyboard/pinephone-keyboard.c
+
 PKTCDVD DRIVER
 M:	linux-block@vger.kernel.org
 S:	Orphan

drivers/input/keyboard/Kconfig

@@ -527,6 +527,19 @@ config KEYBOARD_OPENCORES
 	  To compile this driver as a module, choose M here; the
 	  module will be called opencores-kbd.
 
+config KEYBOARD_PINEPHONE
+	tristate "Pine64 PinePhone Keyboard"
+	depends on I2C && REGULATOR
+	select CRC8
+	select INPUT_MATRIXKMAP
+	help
+	  Say Y here to enable support for the keyboard in the Pine64 PinePhone
+	  keyboard case. This driver supports the FLOSS firmware available at
+	  https://megous.com/git/pinephone-keyboard/
+
+	  To compile this driver as a module, choose M here; the
+	  module will be called pinephone-keyboard.
+
 config KEYBOARD_PXA27x
 	tristate "PXA27x/PXA3xx keypad support"
 	depends on PXA27x || PXA3xx || ARCH_MMP

drivers/input/keyboard/Makefile

@@ -52,6 +52,7 @@ obj-$(CONFIG_KEYBOARD_NSPIRE)		+= nspire-keypad.o
 obj-$(CONFIG_KEYBOARD_OMAP)		+= omap-keypad.o
 obj-$(CONFIG_KEYBOARD_OMAP4)		+= omap4-keypad.o
 obj-$(CONFIG_KEYBOARD_OPENCORES)	+= opencores-kbd.o
+obj-$(CONFIG_KEYBOARD_PINEPHONE)	+= pinephone-keyboard.o
 obj-$(CONFIG_KEYBOARD_PMIC8XXX)		+= pmic8xxx-keypad.o
 obj-$(CONFIG_KEYBOARD_PXA27x)		+= pxa27x_keypad.o
 obj-$(CONFIG_KEYBOARD_PXA930_ROTARY)	+= pxa930_rotary.o