From: Brian Kim <brian.kim@xxxxxxxxxxxxxx> The power button (SW2) on Odroid XU3/4 is connected to the PWRON pin of the S2MPS11 PMIC. The S2MPS11 datasheet says that ONOB pin operates as 'PWRON key active low signal'. In fact, S2MPS11 PMIC acts as a 16ms debouce filter and signal inverter, thus effectively repeating PWRON (active high) to ONOB pin (active low). ONOB PMIC pin is then connected to XEINT3 SoC pin, so we get the state of the power button on the gpx0-3 GPIO. This patch adds device-tree bindings for the power button of Odroid XU3/4 boards. Signed-off-by: Brian Kim <brian.kim@xxxxxxxxxxxxxx> [mszyprow: extended commit message, added comments and fixed minor issues in the dts] Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> --- Changelog: v2: fixed minor issues pointed by Krzysztof Kozlowski: - added comments to dts - extended commit message - removed useless interrupts property - used proper macros for gpios - removed gpio prefix v1: initial submission https://patchwork.kernel.org/patch/9605023/ --- arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi index a183b56283f8..29a718ae621a 100644 --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi @@ -13,6 +13,7 @@ */ #include <dt-bindings/clock/samsung,s2mps11.h> +#include <dt-bindings/input/input.h> #include <dt-bindings/interrupt-controller/irq.h> #include <dt-bindings/gpio/gpio.h> #include <dt-bindings/sound/samsung-i2s.h> @@ -41,6 +42,27 @@ }; }; + gpio_keys { + compatible = "gpio-keys"; + pinctrl-names = "default"; + pinctrl-0 = <&power_key>; + + power_key { + /* + * The power button (SW2) is connected to the PWRON + * pin (active high) of the S2MPS11 PMIC, which acts + * as a 16ms debouce filter and signal inverter with + * output on ONOB pin (active low). ONOB PMIC pin is + * then connected to XEINT3 SoC pin. + */ + gpios = <&gpx0 3 GPIO_ACTIVE_LOW>; + linux,code = <KEY_POWER>; + label = "power key"; + debounce-interval = <0>; + wakeup-source; + }; + }; + emmc_pwrseq: pwrseq { pinctrl-0 = <&emmc_nrst_pin>; pinctrl-names = "default"; @@ -561,6 +583,13 @@ }; &pinctrl_0 { + power_key: power-key { + samsung,pins = "gpx0-3"; + samsung,pin-function = <EXYNOS_PIN_FUNC_INPUT>; + samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>; + samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV1>; + }; + hdmi_hpd_irq: hdmi-hpd-irq { samsung,pins = "gpx3-7"; samsung,pin-function = <EXYNOS_PIN_FUNC_INPUT>; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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