linux-kernel - [PATCH v1 03/12] arm64: dts: librem5-devkit: allow modem to wake the system from suspend

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Date:   Wed,  5 Feb 2020 15:29:54 +0100
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     robh@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com
Cc:     linux-imx@....com, Anson.Huang@....com, devicetree@...r.kernel.org,
        kernel@...i.sm, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "Angus Ainslie (Purism)" <angus@...ea.ca>
Subject: [PATCH v1 03/12] arm64: dts: librem5-devkit: allow modem to wake the system from suspend

From: "Angus Ainslie (Purism)" <angus@...ea.ca>

Connect the WoWWAN signal to a gpio key to wake up the system from suspend.

Signed-off-by: Angus Ainslie (Purism) <angus@...ea.ca>
---
 .../dts/freescale/imx8mq-librem5-devkit.dts   | 27 +++++++++++++++----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
index 8162576e8f3d..ac6ba227e1da 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
@@ -33,7 +33,7 @@
 	gpio-keys {
 		compatible = "gpio-keys";
 		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_gpio_keys>;
+		pinctrl-0 = <&pinctrl_gpio_keys>, <&pinctrl_wwan_in>;
 
 		btn1 {
 			label = "VOL_UP";
@@ -55,6 +55,15 @@
 			wakeup-source;
 			linux,code = <KEY_HP>;
 		};
+
+		wwan_wake {
+			label = "WWAN_WAKE";
+			gpios = <&gpio3 8 GPIO_ACTIVE_LOW>;
+			interrupt-parent = <&gpio3>;
+			interrupts = <8 GPIO_ACTIVE_LOW>;
+			wakeup-source;
+			linux,code = <KEY_PHONE>;
+		};
 	};
 
 	leds {
@@ -767,11 +776,19 @@
 		>;
 	};
 
-	pinctrl_wwan: wwangrp {
+	pinctrl_wwan_in: wwaningrp {
+		fsl,pins = <
+		/* nWoWWAN */
+		MX8MQ_IOMUXC_NAND_DATA02_GPIO3_IO8	0x80
+		>;
+	};
+
+	pinctrl_wwan_out: wwanoutgrp {
 		fsl,pins = <
-			MX8MQ_IOMUXC_NAND_CE3_B_GPIO3_IO4	0x09 /* nWWAN_DISABLE */
-			MX8MQ_IOMUXC_NAND_DATA02_GPIO3_IO8	0x80 /* nWoWWAN */
-			MX8MQ_IOMUXC_NAND_DATA03_GPIO3_IO9	0x19 /* WWAN_RESET */
+		/* nWWAN_DISABLE */
+		MX8MQ_IOMUXC_NAND_CE3_B_GPIO3_IO4	0x09
+		/* WWAN_RESET */
+		MX8MQ_IOMUXC_NAND_DATA03_GPIO3_IO9	0x19
 		>;
 	};
 };
-- 
2.20.1