linux-kernel - [PATCH v1 1/4] ARM: dts: colibri-imx6: improve wake-up with gpio key

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Date:   Mon,  9 Jan 2023 14:19:58 +0100
From:   Marcel Ziswiler <marcel@...wiler.com>
To:     devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-imx@....com, Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>
Subject: [PATCH v1 1/4] ARM: dts: colibri-imx6: improve wake-up with gpio key

From: Marcel Ziswiler <marcel.ziswiler@...adex.com>

The pin GPIO2_IO22 externally pulls down, it is required to sequentially
connect this pin (signal WAKE_MICO#) to +3v3 and then disconnect it to
trigger a wakeup interrupt.
Adding the flag GPIO_PULL_DOWN allows the system to be woken up just
connecting the pin GPIO2_IO22 to +3v3.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
---

 arch/arm/boot/dts/imx6qdl-colibri.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6qdl-colibri.dtsi b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
index d8f985f297e4..9abce6bc6dd4 100644
--- a/arch/arm/boot/dts/imx6qdl-colibri.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
@@ -38,7 +38,7 @@ gpio-keys {
 
 		wakeup {
 			debounce-interval = <10>;
-			gpios = <&gpio2 22 GPIO_ACTIVE_HIGH>; /* SODIMM 45 */
+			gpios = <&gpio2 22 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>; /* SODIMM 45 */
 			label = "Wake-Up";
 			linux,code = <KEY_WAKEUP>;
 			wakeup-source;
-- 
2.35.1