Hi Javier,
Am 26.08.2014 17:28, schrieb Javier Martinez Canillas:
> From: Sjoerd Simons <[email protected]>
>
> The Peach Pit board has an Atmel maXTouch trackpad device.
> Add the needed Device Tree nodes to support it.
>
> This Device Tree change is based on the Chrome OS 3.8 tree
> but adapted to use the mainline Atmel maXTouch DT binding.
>
> Signed-off-by: Sjoerd Simons <[email protected]>
> [javier.martinez: added linux,gpio-keymap property and changed IRQ type]
> Signed-off-by: Javier Martinez Canillas <[email protected]>
> ---
>
> Changes since v1:
> - Change trackpad IRQ pad function from 0x0 (GPIO input) to 0xf (GPIO IRQ).
> suggested by Tomasz Figa.
> - Remove BTN_TOOL_* from "linux,gpio-keymap" property since those are set
> by input mt core if INPUT_MT_POINTER is set. Suggested by Nick Dyer.
> - Use correct values for "linux,gpio-keymap" property. Suggested by Nick
> Dyer.
> - Remove support for Peach Pi board since it uses a different Atmel touchpad
> that requires an Atmel object protocol (T100) not supported by the driver.
> - Use IRQ type constants from <dt-bindings/interrupt-controller/irq.h>
> instead
> of magic numbers. Suggested by Andreas Farber.
> ---
> arch/arm/boot/dts/exynos5420-peach-pit.dts | 31
> ++++++++++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts
> b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> index 228a6b1..e4f82d5 100644
> --- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
> +++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> @@ -11,6 +11,7 @@
> /dts-v1/;
> #include <dt-bindings/input/input.h>
> #include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
> #include "exynos5420.dtsi"
>
> / {
> @@ -157,6 +158,29 @@
> };
> };
>
> +&hsi2c_8 {
> + status = "okay";
> + clock-frequency = <333000>;
> +
> + trackpad@4b {
> + compatible="atmel,maxtouch";
> + reg=<0x4b>;
> + interrupt-parent=<&gpx1>;
> + interrupts=<1 IRQ_TYPE_EDGE_FALLING>;
Nit: Here's a style break (4x spaces around '=' missing).
> + wakeup-source;
> + pinctrl-names = "default";
> + pinctrl-0 = <&trackpad_irq>;
> + linux,gpio-keymap = < KEY_RESERVED
> + KEY_RESERVED
> + 0 /* GPIO 0 */
> + 0 /* GPIO 1 */
> + 0 /* GPIO 2 */
> + BTN_LEFT /* GPIO 3 */
> + KEY_RESERVED
> + KEY_RESERVED >;
> + };
Coincidentally, I experimentally came up with a very similar DT node for
Spring the weekend:
+ trackpad@4b {
+ compatible = "atmel,maxtouch";
+ reg = <0x4b>;
+ interrupt-parent = <&gpx1>;
+ interrupts = <2 IRQ_TYPE_NONE>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&trackpad_irq>;
+ linux,gpio-keymap = <KEY_RESERVED
+ KEY_RESERVED
+ KEY_RESERVED
+ KEY_RESERVED
+ KEY_RESERVED
+ BTN_LEFT>;
+ wakeup-source;
+ };
0 == KEY_RESERVED, so you can consistently use it for GPIO 0-2, too. :)
I probably should add the two trailing _RESERVEDs, too?
With my above snippet I got an awful lot of "Interrupt triggered but
zero messages" warnings (which I simply commented out as quickfix).
Is that why you are using _EDGE_FALLING? Or pin-function 0xf?
(In my case the ChromeOS DT had IRQ_TYPE_NONE and pin-function 0x0.)
Regards,
Andreas
> +};
> +
> &hsi2c_9 {
> status = "okay";
> clock-frequency = <400000>;
> @@ -249,6 +273,13 @@
> samsung,pin-drv = <0>;
> };
>
> + trackpad_irq: trackpad-irq {
> + samsung,pins = "gpx1-1";
> + samsung,pin-function = <0xf>;
> + samsung,pin-pud = <0>;
> + samsung,pin-drv = <0>;
> + };
> +
> power_key_irq: power-key-irq {
> samsung,pins = "gpx1-2";
> samsung,pin-function = <0>;
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