linux-kernel - Re: [PATCH] imx8mm-venice-gw7901: move UART gpio config into hog group

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Date:   Mon, 11 Apr 2022 09:27:14 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Tim Harvey <tharvey@...eworks.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] imx8mm-venice-gw7901: move UART gpio config into hog
 group

On Tue, Apr 05, 2022 at 01:04:07PM -0700, Tim Harvey wrote:
> Move UART related GPIO into hog group so that they still are pinmuxed
> even if the uart driver is not probed.

What are these GPIOs used for?  So they will be used anyway even when
UART support is disabled?

Shawn

> 
> Signed-off-by: Tim Harvey <tharvey@...eworks.com>
> ---
>  .../dts/freescale/imx8mm-venice-gw7901.dts    | 44 +++++++------------
>  1 file changed, 15 insertions(+), 29 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> index 7e7231046215..ee78c189c556 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts
> @@ -710,7 +710,7 @@
>  
>  &uart1 {
>  	pinctrl-names = "default";
> -	pinctrl-0 = <&pinctrl_uart1>, <&pinctrl_uart1_gpio>;
> +	pinctrl-0 = <&pinctrl_uart1>;
>  	rts-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;
>  	cts-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
>  	dtr-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
> @@ -728,7 +728,7 @@
>  
>  &uart3 {
>  	pinctrl-names = "default";
> -	pinctrl-0 = <&pinctrl_uart3>, <&pinctrl_uart3_gpio>;
> +	pinctrl-0 = <&pinctrl_uart3>;
>  	cts-gpios = <&gpio4 10 GPIO_ACTIVE_LOW>;
>  	rts-gpios = <&gpio4 9 GPIO_ACTIVE_LOW>;
>  	status = "okay";
> @@ -736,7 +736,7 @@
>  
>  &uart4 {
>  	pinctrl-names = "default";
> -	pinctrl-0 = <&pinctrl_uart4>, <&pinctrl_uart4_gpio>;
> +	pinctrl-0 = <&pinctrl_uart4>;
>  	cts-gpios = <&gpio5 11 GPIO_ACTIVE_LOW>;
>  	rts-gpios = <&gpio5 12 GPIO_ACTIVE_LOW>;
>  	status = "okay";
> @@ -807,6 +807,18 @@
>  			MX8MM_IOMUXC_SAI3_RXD_GPIO4_IO30	0x40000041 /* SIM2DET# */
>  			MX8MM_IOMUXC_SAI3_RXC_GPIO4_IO29	0x40000041 /* SIM1DET# */
>  			MX8MM_IOMUXC_SPDIF_EXT_CLK_GPIO5_IO5	0x40000041 /* SIM2SEL */
> +			MX8MM_IOMUXC_SAI3_TXFS_GPIO4_IO31	0x40000041 /* WDIS# */
> +			MX8MM_IOMUXC_GPIO1_IO00_GPIO1_IO0	0x40000041 /* UART1_RS422# */
> +			MX8MM_IOMUXC_GPIO1_IO03_GPIO1_IO3	0x40000041 /* UART1_RS485# */
> +			MX8MM_IOMUXC_GPIO1_IO05_GPIO1_IO5	0x40000041 /* UART1_RS232# */
> +			MX8MM_IOMUXC_SAI1_RXD4_GPIO4_IO6	0x40000110 /* UART3_RS232# */
> +			MX8MM_IOMUXC_SAI1_RXD5_GPIO4_IO7	0x40000110 /* UART3_RS422# */
> +			MX8MM_IOMUXC_SAI1_RXD6_GPIO4_IO8	0x40000110 /* UART3_RS485# */
> +
> +			MX8MM_IOMUXC_ECSPI2_SCLK_GPIO5_IO10	0x40000041 /* UART4_RS232# */
> +			MX8MM_IOMUXC_ECSPI2_SS0_GPIO5_IO13	0x40000041 /* UART4_RS422# */
> +			MX8MM_IOMUXC_SAI2_MCLK_GPIO4_IO27	0x40000041 /* UART4_RS485# */
> +
>  		>;
>  	};
>  
> @@ -874,7 +886,6 @@
>  
>  	pinctrl_pcie0: pciegrp {
>  		fsl,pins = <
> -			MX8MM_IOMUXC_SAI3_TXFS_GPIO4_IO31	0x40000041 /* WDIS# */
>  			MX8MM_IOMUXC_SAI3_MCLK_GPIO5_IO2	0x41
>  		>;
>  	};
> @@ -932,14 +943,6 @@
>  		>;
>  	};
>  
> -	pinctrl_uart1_gpio: uart1gpiogrp {
> -		fsl,pins = <
> -			MX8MM_IOMUXC_GPIO1_IO00_GPIO1_IO0	0x40000041 /* RS422# */
> -			MX8MM_IOMUXC_GPIO1_IO03_GPIO1_IO3	0x40000041 /* RS485# */
> -			MX8MM_IOMUXC_GPIO1_IO05_GPIO1_IO5	0x40000041 /* RS232# */
> -		>;
> -	};
> -
>  	pinctrl_uart2: uart2grp {
>  		fsl,pins = <
>  			MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX	0x140
> @@ -956,14 +959,6 @@
>  		>;
>  	};
>  
> -	pinctrl_uart3_gpio: uart3gpiogrp {
> -		fsl,pins = <
> -			MX8MM_IOMUXC_SAI1_RXD4_GPIO4_IO6	0x40000110 /* RS232# */
> -			MX8MM_IOMUXC_SAI1_RXD5_GPIO4_IO7	0x40000110 /* RS422# */
> -			MX8MM_IOMUXC_SAI1_RXD6_GPIO4_IO8	0x40000110 /* RS485# */
> -		>;
> -	};
> -
>  	pinctrl_uart4: uart4grp {
>  		fsl,pins = <
>  			MX8MM_IOMUXC_UART4_RXD_UART4_DCE_RX	0x140
> @@ -973,15 +968,6 @@
>  		>;
>  	};
>  
> -	pinctrl_uart4_gpio: uart4gpiogrp {
> -		fsl,pins = <
> -
> -			MX8MM_IOMUXC_ECSPI2_SCLK_GPIO5_IO10	0x40000041 /* RS232# */
> -			MX8MM_IOMUXC_ECSPI2_SS0_GPIO5_IO13	0x40000041 /* RS422# */
> -			MX8MM_IOMUXC_SAI2_MCLK_GPIO4_IO27	0x40000041 /* RS485# */
> -		>;
> -	};
> -
>  	pinctrl_usdhc1: usdhc1grp {
>  		fsl,pins = <
>  			MX8MM_IOMUXC_SD1_CLK_USDHC1_CLK		0x190
> -- 
> 2.17.1
>