Hi Ludovic,
On Fri, Oct 20, 2017 at 03:31:17PM +0200, Ludovic Desroches wrote:
> Add description of the Atmel PTC subsystem bindings.
>
> Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxxxxxx>
> Acked-by: Rob Herring <robh@xxxxxxxxxx>
> ---
> .../devicetree/bindings/input/atmel,ptc.txt | 67 ++++++++++++++++++++++
> 1 file changed, 67 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/input/atmel,ptc.txt
>
> diff --git a/Documentation/devicetree/bindings/input/atmel,ptc.txt b/Documentation/devicetree/bindings/input/atmel,ptc.txt
> new file mode 100644
> index 000000000000..a183fd511e04
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/atmel,ptc.txt
> @@ -0,0 +1,67 @@
> +Atmel PTC Subsystem
> +
> +The Atmel Peripheral Touch Controller subsystem offers built-in hardware
> +for capacitive touch measurement on sensors that function as buttons, sliders
> +and wheels.
> +
> +1) PTC Subsystem node
> +
> +Required properties:
> +- compatible: Must be "atmel,sama5d2-ptc"
> +- reg: Address, length of the shared memory and ppp registers location
> + and length.
> +- clocks: Phandlers to the clocks.
> +- clock-names: Must be "ptc_clk", "ptc_int_osc", "slow_clk".
> +- #address-cells: Must be one. The cell is the button or scroller id.
> +- #size-cells: Must be zero.
> +
> +Example:
> + ptc@fc060000 {
> + compatible = "atmel,sama5d2-ptc";
> + reg = <0x00800000 0x10000
> + 0xfc060000 0xcf>;
> + interrupts = <58 IRQ_TYPE_LEVEL_HIGH 7>;
> + clocks = <&ptc_clk>, <&main>, <&clk32k>;
> + clock-names = "ptc_clk", "ptc_int_osc", "slow_clk";
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + [ child node definitions... ]
> + };
> +
> +2) Scroller / buttons subnodes
> +
> +Subnodes describe the kind of sensors the customer want to use. They have to be
> +named according to their function: button, slider or wheel.
I wonder do we really need this? Or we can have a generic:
slider@0 {
reg = <0>;
linux,type = <EV_ABS>;
linux,code = <ABS_X>;
},
vertical-slider@1 {
reg = <1>;
linux,type = <EV_ABS>;
linux,code = <ABS_Y>;
},
wheel@2 {
reg = <2>;
linux,type = <EV_ABS>;
linux,code = <ABS_WHEEL>;
},
button@3 {
reg = <3>;
linux,type = <EV_KEY>;
linux,code = <KEY_A>;
},
...
I.e. you specify type/code in a generic way.
Thanks.
--
Dmitry
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