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

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Date:   Mon, 17 Feb 2020 12:02:17 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>
Cc:     robh@...nel.org, mark.rutland@....com, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, 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: Re: [PATCH v1 03/12] arm64: dts: librem5-devkit: allow modem to wake
 the system from suspend

On Wed, Feb 05, 2020 at 03:29:54PM +0100, Martin Kepplinger wrote:
> 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

Why not just add it to pinctrl_gpio_keys to make the change minimal.

> +		>;
> +	};
> +
> +	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

Unnecessary changes.

Shawn

>  		>;
>  	};
>  };
> -- 
> 2.20.1
>