arm: dts: imx8m*-venice: add gpio hog support

Add gpio hog support for board-specific gpio lines:
- put hogs in u-boot.dtsi so as to keep the regular dts files
  in sync with the kernel. The hogs will not be put in the kernel
  as that makes them un-usable by userspace as well as
  re-initializes them to dt defaults overriding changes which may
  have been done by bootloader commands.
- specify gpio names and initial config
- enable GPIO_HOG

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Acked-by: Peng Fan <peng.fan@nxp.com>

arch/arm/dts/imx8mm-venice-gw71xx-0x-u-boot.dtsi

@@ -3,3 +3,49 @@
  * Copyright 2021 Gateworks Corporation
  */
 #include "imx8mm-venice-gw700x-u-boot.dtsi"
+
+&gpio1 {
+	pci_usb_sel {
+		gpio-hog;
+		output-low;
+		gpios = <6 GPIO_ACTIVE_HIGH>;
+		line-name = "pci_usb_sel";
+	};
+
+	dio_0 {
+		gpio-hog;
+		input;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "dio0";
+	};
+
+	dio_1 {
+		gpio-hog;
+		input;
+		gpios = <9 GPIO_ACTIVE_HIGH>;
+		line-name = "dio1";
+	};
+};
+
+&gpio4 {
+	dio_2 {
+		gpio-hog;
+		input;
+		gpios = <3 GPIO_ACTIVE_HIGH>;
+		line-name = "dio2";
+	};
+
+	dio_3 {
+		gpio-hog;
+		input;
+		gpios = <4 GPIO_ACTIVE_HIGH>;
+		line-name = "dio3";
+	};
+
+	pci_wdis {
+		gpio-hog;
+		output-high;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "pci_wdis#";
+	};
+};

arch/arm/dts/imx8mm-venice-gw72xx-0x-u-boot.dtsi

@@ -3,3 +3,84 @@
  * Copyright 2021 Gateworks Corporation
  */
 #include "imx8mm-venice-gw700x-u-boot.dtsi"
+
+&gpio1 {
+	rs485_term {
+		gpio-hog;
+		output-low;
+		gpios = <0 GPIO_ACTIVE_HIGH>;
+		line-name = "rs485_term";
+	};
+
+	mipi_gpio4 {
+		gpio-hog;
+		input;
+		gpios = <1 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio4";
+	};
+
+	pci_usb_sel {
+		gpio-hog;
+		output-low;
+		gpios = <6 GPIO_ACTIVE_HIGH>;
+		line-name = "pci_usb_sel";
+	};
+
+	dio_0 {
+		gpio-hog;
+		input;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "dio0";
+	};
+
+	dio_1 {
+		gpio-hog;
+		input;
+		gpios = <9 GPIO_ACTIVE_HIGH>;
+		line-name = "dio1";
+	};
+};
+
+&gpio4 {
+	rs485_en {
+		gpio-hog;
+		output-low;
+		gpios = <0 GPIO_ACTIVE_HIGH>;
+		line-name = "rs485_en";
+	};
+
+	mipi_gpio3 {
+		gpio-hog;
+		input;
+		gpios = <1 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio3";
+	};
+
+	rs485_half {
+		gpio-hog;
+		output-low;
+		gpios = <2 GPIO_ACTIVE_HIGH>;
+		line-name = "rs485_hd";
+	};
+
+	mipi_gpio2 {
+		gpio-hog;
+		input;
+		gpios = <3 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio2";
+	};
+
+	mipi_gpio1 {
+		gpio-hog;
+		input;
+		gpios = <4 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio1";
+	};
+
+	pci_wdis {
+		gpio-hog;
+		output-high;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "pci_wdis#";
+	};
+};

arch/arm/dts/imx8mm-venice-gw73xx-0x-u-boot.dtsi

@@ -3,3 +3,84 @@
  * Copyright 2021 Gateworks Corporation
  */
 #include "imx8mm-venice-gw700x-u-boot.dtsi"
+
+&gpio1 {
+	rs485_term {
+		gpio-hog;
+		output-low;
+		gpios = <0 GPIO_ACTIVE_HIGH>;
+		line-name = "rs485_term";
+	};
+
+	mipi_gpio4 {
+		gpio-hog;
+		input;
+		gpios = <1 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio4";
+	};
+
+	pci_usb_sel {
+		gpio-hog;
+		output-low;
+		gpios = <6 GPIO_ACTIVE_HIGH>;
+		line-name = "pci_usb_sel";
+	};
+
+	dio_0 {
+		gpio-hog;
+		input;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "dio0";
+	};
+
+	dio_1 {
+		gpio-hog;
+		input;
+		gpios = <9 GPIO_ACTIVE_HIGH>;
+		line-name = "dio1";
+	};
+};
+
+&gpio4 {
+	rs485_en {
+		gpio-hog;
+		output-low;
+		gpios = <0 GPIO_ACTIVE_HIGH>;
+		line-name = "rs485_en";
+	};
+
+	mipi_gpio3 {
+		gpio-hog;
+		input;
+		gpios = <1 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio3";
+	};
+
+	rs485_half {
+		gpio-hog;
+		output-low;
+		gpios = <2 GPIO_ACTIVE_HIGH>;
+		line-name = "rs485_hd";
+	};
+
+	mipi_gpio2 {
+		gpio-hog;
+		input;
+		gpios = <3 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio2";
+	};
+
+	mipi_gpio1 {
+		gpio-hog;
+		input;
+		gpios = <4 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio1";
+	};
+
+	pci_wdis {
+		gpio-hog;
+		output-high;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "pci_wdis#";
+	};
+};

arch/arm/dts/imx8mm-venice-gw7901-u-boot.dtsi

@@ -5,6 +5,124 @@
 
 #include "imx8mm-venice-u-boot.dtsi"
 
+&gpio1 {
+	uart1_rs422 {
+		gpio-hog;
+		output-high;
+		gpios = <0 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_rs422#";
+	};
+
+	uart1rs485 {
+		gpio-hog;
+		output-high;
+		gpios = <3 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_rs485#";
+	};
+
+	uart1rs232 {
+		gpio-hog;
+		output-high;
+		gpios = <5 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_rs232#";
+	};
+
+	dig1in {
+		gpio-hog;
+		input;
+		gpios = <6 GPIO_ACTIVE_HIGH>;
+		line-name = "dig1_in";
+	};
+
+	dig1out {
+		gpio-hog;
+		output-low;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "dig1_out";
+	};
+};
+
+&gpio4 {
+	uart3_rs232 {
+		gpio-hog;
+		output-high;
+		gpios = <6 GPIO_ACTIVE_HIGH>;
+		line-name = "uart3_rs232#";
+	};
+
+	uart3_rs422 {
+		gpio-hog;
+		output-high;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "uart3_rs422#";
+	};
+
+	uart3_rs485 {
+		gpio-hog;
+		output-high;
+		gpios = <8 GPIO_ACTIVE_HIGH>;
+		line-name = "uart3_rs485#";
+	};
+
+	uart4_rs485 {
+		gpio-hog;
+		output-high;
+		gpios = <27 GPIO_ACTIVE_HIGH>;
+		line-name = "uart4_rs485#";
+	};
+
+	sim1det {
+		gpio-hog;
+		input;
+		gpios = <29 GPIO_ACTIVE_HIGH>;
+		line-name = "sim1_det";
+	};
+
+	sim2det {
+		gpio-hog;
+		input;
+		gpios = <30 GPIO_ACTIVE_HIGH>;
+		line-name = "sim2_det";
+	};
+};
+
+&gpio5 {
+	dig2out {
+		gpio-hog;
+		output-low;
+		gpios = <3 GPIO_ACTIVE_HIGH>;
+		line-name = "dig2_out";
+	};
+
+	dig2in {
+		gpio-hog;
+		input;
+		gpios = <4 GPIO_ACTIVE_HIGH>;
+		line-name = "dig2_in";
+	};
+
+	sim2sel {
+		gpio-hog;
+		output-low;
+		gpios = <5 GPIO_ACTIVE_HIGH>;
+		line-name = "sim2_sel";
+	};
+
+	uart4_rs232 {
+		gpio-hog;
+		output-high;
+		gpios = <10 GPIO_ACTIVE_HIGH>;
+		line-name = "uart4_rs232#";
+	};
+
+	uart4_rs422 {
+		gpio-hog;
+		output-high;
+		gpios = <13 GPIO_ACTIVE_HIGH>;
+		line-name = "uart4_rs422#";
+	};
+};
+
 &fec1 {
 	phy-reset-gpios = <&gpio4 19 GPIO_ACTIVE_LOW>;
 	phy-reset-duration = <1>;

arch/arm/dts/imx8mm-venice-gw7902-u-boot.dtsi

@@ -5,6 +5,156 @@
 
 #include "imx8mm-venice-u-boot.dtsi"
 
+&gpio1 {
+	m2rst {
+		gpio-hog;
+		output-low;
+		gpios = <13 GPIO_ACTIVE_HIGH>;
+		line-name = "m2_reset";
+	};
+
+	m2wdis {
+		gpio-hog;
+		output-high;
+		gpios = <15 GPIO_ACTIVE_HIGH>;
+		line-name = "m2_wdis#";
+	};
+};
+
+&gpio2 {
+	uart2en {
+		gpio-hog;
+		output-high;
+		gpios = <8 GPIO_ACTIVE_HIGH>;
+		line-name = "uart2_en#";
+	};
+};
+
+&gpio3 {
+	m2gdis {
+		gpio-hog;
+		output-high;
+		gpios = <1 GPIO_ACTIVE_HIGH>;
+		line-name = "m2_gdis#";
+	};
+
+	m2off {
+		gpio-hog;
+		output-high;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "m2_off#";
+	};
+};
+
+&gpio4 {
+	ampgpio3 {
+		gpio-hog;
+		input;
+		gpios = <11 GPIO_ACTIVE_HIGH>;
+		line-name = "amp_gpio3";
+	};
+
+	ampgpio2 {
+		gpio-hog;
+		input;
+		gpios = <12 GPIO_ACTIVE_HIGH>;
+		line-name = "amp_gpio2";
+	};
+
+	ampgpio1 {
+		gpio-hog;
+		input;
+		gpios = <14 GPIO_ACTIVE_HIGH>;
+		line-name = "amp_gpio1";
+	};
+
+	ltrpwr {
+		gpio-hog;
+		output-low;
+		gpios = <16 GPIO_ACTIVE_HIGH>;
+		line-name = "lte_pwr#";
+	};
+
+	lterst {
+		gpio-hog;
+		output-low;
+		gpios = <17 GPIO_ACTIVE_HIGH>;
+		line-name = "lte_rst";
+	};
+
+	ampgpio4 {
+		gpio-hog;
+		input;
+		gpios = <20 GPIO_ACTIVE_HIGH>;
+		line-name = "amp_gpio4";
+	};
+
+	appgpio1 {
+		gpio-hog;
+		input;
+		gpios = <21 GPIO_ACTIVE_HIGH>;
+		line-name = "app_gpio1";
+	};
+
+	uart1rs485 {
+		gpio-hog;
+		output-low;
+		gpios = <23 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_rs485";
+	};
+
+	uart1term {
+		gpio-hog;
+		output-low;
+		gpios = <25 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_term";
+	};
+
+	uart1half {
+		gpio-hog;
+		output-low;
+		gpios = <26 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_half";
+	};
+
+	appgpio2 {
+		gpio-hog;
+		input;
+		gpios = <27 GPIO_ACTIVE_HIGH>;
+		line-name = "app_gpio2";
+	};
+
+	mipigpio1 {
+		gpio-hog;
+		input;
+		gpios = <28 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio1";
+	};
+};
+
+&gpio5 {
+	mipigpio4 {
+		gpio-hog;
+		input;
+		gpios = <3 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio4";
+	};
+
+	mipigpio3 {
+		gpio-hog;
+		input;
+		gpios = <4 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio3";
+	};
+
+	mipigpio2 {
+		gpio-hog;
+		input;
+		gpios = <5 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio2";
+	};
+};
+
 &fec1 {
 	phy-reset-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;
 	phy-reset-duration = <1>;

arch/arm/dts/imx8mm-venice-gw7903-u-boot.dtsi

@@ -5,6 +5,89 @@
 
 #include "imx8mm-venice-u-boot.dtsi"
 
+&gpio1 {
+	rs422en {
+		gpio-hog;
+		output-high;
+		gpios = <10 GPIO_ACTIVE_HIGH>;
+		line-name = "rs422_en#";
+	};
+
+	rs485en {
+		gpio-hog;
+		output-high;
+		gpios = <11 GPIO_ACTIVE_HIGH>;
+		line-name = "rs485_en#";
+	};
+
+	rs232en {
+		gpio-hog;
+		output-low;
+		gpios = <12 GPIO_ACTIVE_HIGH>;
+		line-name = "rs232_en#";
+	};
+};
+
+&gpio2 {
+	dig2in {
+		gpio-hog;
+		input;
+		gpios = <0 GPIO_ACTIVE_HIGH>;
+		line-name = "dig2_in";
+	};
+
+	dig2out {
+		gpio-hog;
+		output-high;
+		gpios = <1 GPIO_ACTIVE_HIGH>;
+		line-name = "dig2_out#";
+	};
+
+	dig1out {
+		gpio-hog;
+		output-high;
+		gpios = <8 GPIO_ACTIVE_HIGH>;
+		line-name = "dig1_out#";
+	};
+
+	dig1in {
+		gpio-hog;
+		input;
+		gpios = <9 GPIO_ACTIVE_HIGH>;
+		line-name = "dig1_in";
+	};
+};
+
+&gpio5 {
+	sim1det {
+		gpio-hog;
+		input;
+		gpios = <7 GPIO_ACTIVE_LOW>;
+		line-name = "sim1_det#";
+	};
+
+	sim2det {
+		gpio-hog;
+		input;
+		gpios = <8 GPIO_ACTIVE_LOW>;
+		line-name = "sim2_det#";
+	};
+
+	sim2sel {
+		gpio-hog;
+		output-low;
+		gpios = <9 GPIO_ACTIVE_HIGH>;
+		line-name = "sim2_sel";
+	};
+
+	pci_wdis {
+		gpio-hog;
+		output-high;
+		gpios = <12 GPIO_ACTIVE_HIGH>;
+		line-name = "pci_wdis#";
+	};
+};
+
 &fec1 {
 	phy-reset-gpios = <&gpio4 25 GPIO_ACTIVE_LOW>;
 	phy-reset-duration = <1>;

arch/arm/dts/imx8mn-venice-gw7902-u-boot.dtsi

@@ -5,6 +5,114 @@
 
 #include "imx8mn-venice-u-boot.dtsi"
 
+&gpio1 {
+	m2rst {
+		gpio-hog;
+		output-low;
+		gpios = <13 GPIO_ACTIVE_HIGH>;
+		line-name = "m2_reset";
+	};
+
+	m2wdis {
+		gpio-hog;
+		output-high;
+		gpios = <15 GPIO_ACTIVE_HIGH>;
+		line-name = "m2_wdis#";
+	};
+};
+
+&gpio2 {
+	uart2en {
+		gpio-hog;
+		output-high;
+		gpios = <8 GPIO_ACTIVE_HIGH>;
+		line-name = "uart2_en#";
+	};
+};
+
+&gpio3 {
+	m2gdis {
+		gpio-hog;
+		output-high;
+		gpios = <1 GPIO_ACTIVE_HIGH>;
+		line-name = "m2_gdis#";
+	};
+
+	m2off {
+		gpio-hog;
+		output-high;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		line-name = "m2_off#";
+	};
+};
+
+&gpio4 {
+	appgpio1 {
+		gpio-hog;
+		input;
+		gpios = <21 GPIO_ACTIVE_HIGH>;
+		line-name = "app_gpio1";
+	};
+
+	uart1rs485 {
+		gpio-hog;
+		output-low;
+		gpios = <23 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_rs485";
+	};
+
+	uart1term {
+		gpio-hog;
+		output-low;
+		gpios = <25 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_term";
+	};
+
+	uart1half {
+		gpio-hog;
+		output-low;
+		gpios = <26 GPIO_ACTIVE_HIGH>;
+		line-name = "uart1_half";
+	};
+
+	appgpio2 {
+		gpio-hog;
+		input;
+		gpios = <27 GPIO_ACTIVE_HIGH>;
+		line-name = "app_gpio2";
+	};
+
+	mipigpio1 {
+		gpio-hog;
+		input;
+		gpios = <28 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio1";
+	};
+};
+
+&gpio5 {
+	mipigpio4 {
+		gpio-hog;
+		input;
+		gpios = <3 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio4";
+	};
+
+	mipigpio3 {
+		gpio-hog;
+		input;
+		gpios = <4 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio3";
+	};
+
+	mipigpio2 {
+		gpio-hog;
+		input;
+		gpios = <5 GPIO_ACTIVE_HIGH>;
+		line-name = "mipi_gpio2";
+	};
+};
+
 &fec1 {
 	phy-reset-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;
 	phy-reset-duration = <1>;

configs/imx8mm_venice_defconfig

@@ -73,6 +73,7 @@ CONFIG_SPL_CLK_COMPOSITE_CCF=y
 CONFIG_CLK_COMPOSITE_CCF=y
 CONFIG_SPL_CLK_IMX8MM=y
 CONFIG_CLK_IMX8MM=y
+CONFIG_GPIO_HOG=y
 CONFIG_MXC_GPIO=y
 CONFIG_DM_I2C=y
 CONFIG_LED=y

configs/imx8mn_venice_defconfig

@@ -72,6 +72,7 @@ CONFIG_TFTP_BLOCKSIZE=4096
 CONFIG_SPL_DM=y
 CONFIG_SPL_CLK_IMX8MN=y
 CONFIG_CLK_IMX8MN=y
+CONFIG_GPIO_HOG=y
 CONFIG_MXC_GPIO=y
 CONFIG_DM_I2C=y
 CONFIG_LED=y