On Wed, Mar 21, 2018 at 06:04:34PM +0100, Mark Jonas wrote:
> From: Zhu Yi <yi.zhu5@xxxxxxxxxxxx>
>
> Add the ROHM BU21029 resistive touch panel controller
> support with i2c interface.
>
> Signed-off-by: Zhu Yi <yi.zhu5@xxxxxxxxxxxx>
> Signed-off-by: Mark Jonas <mark.jonas@xxxxxxxxxxxx>
> Reviewed-by: Heiko Schocher <hs@xxxxxxx>
> ---
> .../bindings/input/touchscreen/bu21029.txt | 30 ++
> drivers/input/touchscreen/Kconfig | 12 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/bu21029_ts.c | 456 +++++++++++++++++++++
> 4 files changed, 499 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/input/touchscreen/bu21029.txt
> create mode 100644 drivers/input/touchscreen/bu21029_ts.c
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/bu21029.txt b/Documentation/devicetree/bindings/input/touchscreen/bu21029.txt
> new file mode 100644
> index 0000000..7b61602
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/bu21029.txt
> @@ -0,0 +1,30 @@
> +* Rohm BU21029 Touch Screen Controller
> +
> +Required properties:
> + - compatible : must be "rohm,bu21029"
> + - reg : i2c device address of the chip
What the valid value(s)?
> + - interrupt-parent : the phandle for the gpio controller
> + - interrupts : (gpio) interrupt to which the chip is connected
> + - reset-gpios : gpio pin to reset the chip
Active high or low?
> + - rohm,x-plate-ohms : x-plate resistance in ohms
IIRC, we have a standard touchscreen property for this?
> +
> +Optional properties:
> + - touchscreen-max-pressure: maximum pressure value
> +
> +Example:
> +
> + &i2c1 {
> + /* ... */
> +
> + bu21029: bu21029@40 {
> + compatible = "rohm,bu21029";
> + reg = <0x40>;
> + interrupt-parent = <&gpio1>;
> + interrupts = <4 IRQ_TYPE_EDGE_FALLING>;
> + reset-gpios = <&gpio6 16 GPIO_ACTIVE_LOW>;
> + rohm,x-plate-ohms = <600>;
> + touchscreen-max-pressure = <4095>;
> + };
> +
> + /* ... */
> + };
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