From: João Paulo Gonçalves <joao.goncalves@toradex.com>

Add Toradex Verdin Ivy carrier board support. One notable feature of Ivy
is the analog inputs. These inputs are multiplexed, allowing the same
input to measure either voltage or current. For current measurements,
a GPIO switch enables or disables the shunt resistor. This process is
automatically managed by the Linux kernel using the IIO and MUX
subsystems. Voltage measurement is always enabled, but the voltage
measured by the ADC is scaled by a cascade voltage divider. In the
device tree, the equivalent gain of the voltage divider is used, which
can be calculated as follows:

               ------------
               +          |
                         .-.
              R1=30K     | |
                         | |
                         '-'
                          |-------------------
    Analog Input (AIN)    |                  |
                         .-.                .-.
                  R2=10K | |         R3=30K | |
                         | |                | |
                         '-'                '-'
                          |                  |
                          |                  |--------
                          |                 .-.      +
                          |          R4=10K | |
                          |                 | |      ADC Input (Channels 0 and 1)
                          |                 '-'
               -          |                  |       -
               -----------|                  |--------
                         ===                ===
                         GND                GND

Vin  = Analog Input (AIN)
Vout = ADC Input
Rth  = Thevenin Equiv. Resistance
Vth  = Thevenin Equiv. Voltage
RL   = Load Resistor

R1 = 30K, R2 = 10K, R3 = 30K, R4 = 10K
RL = R4 = 10K

Rth  = (R1 // R2) + R3 = 37500 Ohms
Vth  = (Vin * R2) / (R1 + R2) = Vin/4;
Vout = (Vth * RL)/ (Rth + RL) = Vth/4.75 = Vin/19
Gain = Vout/Vin = 1/19

https://www.toradex.com/products/carrier-board/ivy-carrier-board

Signed-off-by: João Paulo Gonçalves <joao.goncalves@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
---
 arch/arm64/boot/dts/freescale/Makefile        |   2 +
 .../boot/dts/freescale/imx8mm-verdin-ivy.dtsi | 471 ++++++++++++++++++
 .../freescale/imx8mm-verdin-nonwifi-ivy.dts   |  18 +
 .../dts/freescale/imx8mm-verdin-wifi-ivy.dts  |  18 +
 4 files changed, 509 insertions(+)
 create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-verdin-ivy.dtsi
 create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-verdin-nonwifi-ivy.dts
 create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-verdin-wifi-ivy.dts

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 9d3df8b218a2..5345cab0996c 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -136,10 +136,12 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw7903.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw7904.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-nonwifi-dahlia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-nonwifi-dev.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-nonwifi-ivy.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-nonwifi-mallow.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-nonwifi-yavia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dahlia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dev.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-ivy.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-mallow.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-yavia.dtb
 
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin-ivy.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-verdin-ivy.dtsi
new file mode 100644
index 000000000000..29075ff5eda6
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin-ivy.dtsi
@@ -0,0 +1,471 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright 2024 Toradex
+ *
+ * Common dtsi for Verdin IMX8MM SoM on Ivy carrier board
+ *
+ * https://www.toradex.com/computer-on-modules/verdin-arm-family/nxp-imx-8m-mini-nano
+ * https://www.toradex.com/products/carrier-board/ivy-carrier-board
+ */
+
+#include <dt-bindings/mux/mux.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	/* AIN1 Voltage w/o AIN1_MODE gpio control */
+	ain1_voltage_unmanaged: voltage-divider-ain1 {
+		compatible = "voltage-divider";
+		#io-channel-cells = <1>;
+		io-channels = <&ivy_adc1 0>;
+		full-ohms = <19>;
+		output-ohms = <1>;
+	};
+
+	/* AIN1 Current w/o AIN1_MODE gpio control */
+	ain1_current_unmanaged: current-sense-shunt-ain1 {
+		compatible = "current-sense-shunt";
+		#io-channel-cells = <0>;
+		io-channels = <&ivy_adc1 1>;
+		shunt-resistor-micro-ohms = <100000000>;
+	};
+
+	/* AIN1_MODE - SODIMM 216 */
+	ain1_mode_mux_ctrl: mux-controller-0 {
+		compatible = "gpio-mux";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio5>;
+		#mux-control-cells = <0>;
+		mux-gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;
+	};
+
+	ain1-voltage {
+		compatible = "io-channel-mux";
+		channels = "ain1_voltage", "";
+		io-channels = <&ain1_voltage_unmanaged 0>;
+		io-channel-names = "parent";
+		mux-controls = <&ain1_mode_mux_ctrl>;
+		settle-time-us = <1000>;
+	};
+
+	ain1-current {
+		compatible = "io-channel-mux";
+		channels = "", "ain1_current";
+		io-channels = <&ain1_current_unmanaged>;
+		io-channel-names = "parent";
+		mux-controls = <&ain1_mode_mux_ctrl>;
+		settle-time-us = <1000>;
+	};
+
+	/* AIN2 Voltage w/o AIN2_MODE gpio control */
+	ain2_voltage_unmanaged: voltage-divider-ain2 {
+		compatible = "voltage-divider";
+		#io-channel-cells = <1>;
+		io-channels = <&ivy_adc2 0>;
+		full-ohms = <19>;
+		output-ohms = <1>;
+	};
+
+	/* AIN2 Current w/o AIN2_MODE gpio control */
+	ain2_current_unmanaged: current-sense-shunt-ain2 {
+		compatible = "current-sense-shunt";
+		#io-channel-cells = <0>;
+		io-channels = <&ivy_adc2 1>;
+		shunt-resistor-micro-ohms = <100000000>;
+	};
+
+	/* AIN2_MODE - SODIMM 218 */
+	ain2_mode_mux_ctrl: mux-controller-1 {
+		compatible = "gpio-mux";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio6>;
+		#mux-control-cells = <0>;
+		mux-gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
+	};
+
+	ain2-voltage {
+		compatible = "io-channel-mux";
+		channels = "ain2_voltage", "";
+		io-channels = <&ain2_voltage_unmanaged 0>;
+		io-channel-names = "parent";
+		mux-controls = <&ain2_mode_mux_ctrl>;
+		settle-time-us = <1000>;
+	};
+
+	ain2-current {
+		compatible = "io-channel-mux";
+		channels = "", "ain2_current";
+		io-channels = <&ain2_current_unmanaged>;
+		io-channel-names = "parent";
+		mux-controls = <&ain2_mode_mux_ctrl>;
+		settle-time-us = <1000>;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_ivy_leds>;
+
+		/* D7 Blue - SODIMM 30 - LEDs.GPIO1 */
+		led-0 {
+			color = <LED_COLOR_ID_BLUE>;
+			default-state = "off";
+			function = LED_FUNCTION_STATUS;
+			function-enumerator = <1>;
+			gpios = <&gpio4 25 GPIO_ACTIVE_HIGH>;
+		};
+
+		/* D7 Green - SODIMM 32 - LEDs.GPIO2 */
+		led-1 {
+			color = <LED_COLOR_ID_GREEN>;
+			default-state = "off";
+			function = LED_FUNCTION_STATUS;
+			function-enumerator = <1>;
+			gpios = <&gpio4 24 GPIO_ACTIVE_HIGH>;
+		};
+
+		/* D7 Red - SODIMM 34 - LEDs.GPIO3 */
+		led-2 {
+			color = <LED_COLOR_ID_RED>;
+			default-state = "off";
+			function = LED_FUNCTION_STATUS;
+			function-enumerator = <1>;
+			gpios = <&gpio4 26 GPIO_ACTIVE_HIGH>;
+		};
+
+		/* D8 Blue - SODIMM 36 - LEDs.GPIO4 */
+		led-3 {
+			color = <LED_COLOR_ID_BLUE>;
+			default-state = "off";
+			function = LED_FUNCTION_STATUS;
+			function-enumerator = <2>;
+			gpios = <&gpio4 23 GPIO_ACTIVE_HIGH>;
+		};
+
+		/* D8 Green - SODIMM 54 - LEDs.GPIO5 */
+		led-4 {
+			color = <LED_COLOR_ID_GREEN>;
+			default-state = "off";
+			function = LED_FUNCTION_STATUS;
+			function-enumerator = <2>;
+			gpios = <&gpio3 1 GPIO_ACTIVE_HIGH>;
+		};
+
+		/* D8 Red - SODIMM 44 - LEDs.GPIO6 */
+		led-5 {
+			color = <LED_COLOR_ID_RED>;
+			default-state = "off";
+			function = LED_FUNCTION_STATUS;
+			function-enumerator = <2>;
+			gpios = <&gpio3 22 GPIO_ACTIVE_HIGH>;
+		};
+
+		/* D9 Blue - SODIMM 46 - LEDs.GPIO7 */
+		led-6 {
+			color = <LED_COLOR_ID_BLUE>;
+			default-state = "off";
+			function = LED_FUNCTION_STATUS;
+			function-enumerator = <3>;
+			gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>;
+		};
+
+		/* D9 Red - SODIMM 48 - LEDs.GPIO8 */
+		led-7 {
+			color = <LED_COLOR_ID_RED>;
+			default-state = "off";
+			function = LED_FUNCTION_STATUS;
+			function-enumerator = <3>;
+			gpios = <&gpio3 21 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	reg_3v2_ain1: regulator-3v2-ain1 {
+		compatible = "regulator-fixed";
+		regulator-max-microvolt = <3200000>;
+		regulator-min-microvolt = <3200000>;
+		regulator-name = "+3V2_AIN1";
+	};
+
+	reg_3v2_ain2: regulator-3v2-ain2 {
+		compatible = "regulator-fixed";
+		regulator-max-microvolt = <3200000>;
+		regulator-min-microvolt = <3200000>;
+		regulator-name = "+3V2_AIN2";
+	};
+
+	/* Ivy Power Supply Input Voltage */
+	ivy-input-voltage {
+		compatible = "voltage-divider";
+		/* Verdin ADC_1 */
+		io-channels = <&verdin_som_adc 7>;
+		full-ohms = <204700>; /* 200k + 4.7k */
+		output-ohms = <4700>;
+	};
+
+	ivy-5v-voltage {
+		compatible = "voltage-divider";
+		/* Verdin ADC_2 */
+		io-channels = <&verdin_som_adc 6>;
+		full-ohms = <39000>; /* 27k + 12k */
+		output-ohms = <12000>;
+	};
+
+	ivy-3v3-voltage {
+		compatible = "voltage-divider";
+		/* Verdin ADC_3 */
+		io-channels = <&verdin_som_adc 5>;
+		full-ohms = <54000>; /* 27k + 27k */
+		output-ohms = <27000>;
+	};
+
+	ivy-1v8-voltage {
+		compatible = "voltage-divider";
+		/* Verdin ADC_4 */
+		io-channels = <&verdin_som_adc 4>;
+		full-ohms = <39000>; /* 12k + 27k */
+		output-ohms = <27000>;
+	};
+};
+
+/* Verdin SPI_1 */
+&ecspi2 {
+	pinctrl-0 = <&pinctrl_ecspi2>,
+		    <&pinctrl_gpio1>,
+		    <&pinctrl_gpio4>;
+	cs-gpios = <&gpio5 13 GPIO_ACTIVE_LOW>,
+		   <&gpio3 4 GPIO_ACTIVE_LOW>,
+		   <&gpio5 27 GPIO_ACTIVE_LOW>;
+	status = "okay";
+
+	tpm@1 {
+		compatible = "infineon,slb9670", "tcg,tpm_tis-spi";
+		reg = <1>;
+		spi-max-frequency = <18500000>;
+	};
+
+	fram@2 {
+		compatible = "fujitsu,mb85rs256", "atmel,at25";
+		reg = <2>;
+		address-width = <16>;
+		size = <32768>;
+		spi-max-frequency = <33000000>;
+		pagesize = <1>;
+	};
+};
+
+/* EEPROM on Ivy */
+&eeprom_carrier_board {
+	status = "okay";
+};
+
+/* Verdin ETH_1 */
+&fec1 {
+	status = "okay";
+};
+
+&gpio3 {
+	gpio-line-names =
+		"", /* 0 */
+		"",
+		"REL3", /* SODIMM 64 */
+		"",
+		"",
+		"",
+		"DIG_1", /* SODIMM 56 */
+		"DIG_2", /* SODIMM 58 */
+		"REL1",  /* SODIMM 60 */
+		"REL2",  /* SODIMM 62 */
+		"", /* 10 */
+		"",
+		"",
+		"",
+		"REL4",  /* SODIMM 66 */
+		"",
+		"",
+		"",
+		"",
+		"",
+		"", /* 20 */
+		"",
+		"",
+		"",
+		"",
+		"";
+};
+
+&gpio5 {
+	gpio-line-names =
+		"", /* 0 */
+		"",
+		"",
+		"",
+		"",
+		"GPIO2", /* Verdin GPIO_2 - SODIMM 208 */
+		"",
+		"",
+		"",
+		"",
+		"", /* 10 */
+		"",
+		"",
+		"",
+		"",
+		"",
+		"",
+		"",
+		"",
+		"",
+		"", /* 20 */
+		"",
+		"",
+		"",
+		"",
+		"",
+		"GPIO3", /* Verdin GPIO_3 - SODIMM 210 */
+		"",
+		"",
+		"";
+};
+
+/* Temperature sensor on Ivy */
+&hwmon_temp {
+	compatible = "ti,tmp1075";
+	status = "okay";
+};
+
+/* Verdin I2C_4 CSI */
+&i2c3 {
+	status = "okay";
+
+	ivy_adc1: adc@40 {
+		compatible = "ti,ads1119";
+		reg = <0x40>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio7>;
+		interrupt-parent = <&gpio1>;
+		interrupts = <8 IRQ_TYPE_EDGE_FALLING>;
+		avdd-supply = <&reg_3v2_ain1>;
+		dvdd-supply = <&reg_3v2_ain1>;
+		vref-supply = <&reg_3v2_ain1>;
+		#address-cells = <1>;
+		#io-channel-cells = <1>;
+		#size-cells = <0>;
+
+		/* AIN1 0-33V Voltage Input */
+		channel@0 {
+			reg = <0>;
+			diff-channels = <0 1>;
+		};
+
+		/* AIN1 0-20mA Current Input */
+		channel@1 {
+			reg = <1>;
+			diff-channels = <2 3>;
+		};
+	};
+
+	ivy_adc2: adc@41 {
+		compatible = "ti,ads1119";
+		reg = <0x41>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_gpio8>;
+		interrupt-parent = <&gpio1>;
+		interrupts = <9 IRQ_TYPE_EDGE_FALLING>;
+		avdd-supply = <&reg_3v2_ain2>;
+		dvdd-supply = <&reg_3v2_ain2>;
+		vref-supply = <&reg_3v2_ain2>;
+		#address-cells = <1>;
+		#io-channel-cells = <1>;
+		#size-cells = <0>;
+
+		/* AIN2 0-33V Voltage Input */
+		channel@0 {
+			reg = <0>;
+			diff-channels = <0 1>;
+		};
+
+		/* AIN2 0-20mA Current Input */
+		channel@1 {
+			reg = <1>;
+			diff-channels = <2 3>;
+		};
+	};
+};
+
+/* Verdin I2C_1 */
+&i2c4 {
+	status = "okay";
+};
+
+/* Verdin PCIE_1 */
+&pcie0 {
+	status = "okay";
+};
+
+&pcie_phy {
+	status = "okay";
+};
+
+/* Verdin UART_3 */
+&uart1 {
+	status = "okay";
+};
+
+/* Verdin UART_1 */
+&uart2 {
+	status = "okay";
+};
+
+/* Verdin UART_2 */
+&uart3 {
+	linux,rs485-enabled-at-boot-time;
+	rs485-rx-during-tx;
+	status = "okay";
+};
+
+/* Verdin USB_1*/
+&usbotg1 {
+	status = "okay";
+};
+
+/* Verdin USB_2 */
+&usbotg2 {
+	status = "okay";
+};
+
+/* Verdin SD_1 */
+&usdhc2 {
+	status = "okay";
+};
+
+&iomuxc {
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_gpio2>, <&pinctrl_gpio3>,
+		    <&pinctrl_ivy_dig_inputs>, <&pinctrl_ivy_relays>;
+
+	pinctrl_ivy_dig_inputs: ivydiginputsgrp {
+		fsl,pins =
+			<MX8MM_IOMUXC_NAND_DATA00_GPIO3_IO6	0x96>, /* SODIMM 56 */
+			<MX8MM_IOMUXC_NAND_DATA01_GPIO3_IO7	0x96>; /* SODIMM 58 */
+	};
+
+	pinctrl_ivy_leds: ivyledsgrp {
+		fsl,pins =
+			<MX8MM_IOMUXC_SAI2_TXC_GPIO4_IO25	0x16>, /* SODIMM 30 */
+			<MX8MM_IOMUXC_SAI2_TXFS_GPIO4_IO24	0x16>, /* SODIMM 32 */
+			<MX8MM_IOMUXC_SAI2_TXD0_GPIO4_IO26	0x16>, /* SODIMM 34 */
+			<MX8MM_IOMUXC_SAI2_RXD0_GPIO4_IO23	0x16>, /* SODIMM 36 */
+			<MX8MM_IOMUXC_SAI5_RXD1_GPIO3_IO22	0x16>, /* SODIMM 44 */
+			<MX8MM_IOMUXC_SAI5_RXD3_GPIO3_IO24	0x16>, /* SODIMM 46 */
+			<MX8MM_IOMUXC_SAI5_RXD0_GPIO3_IO21	0x16>, /* SODIMM 48 */
+			<MX8MM_IOMUXC_NAND_CE0_B_GPIO3_IO1	0x16>; /* SODIMM 54 */
+	};
+
+	pinctrl_ivy_relays: ivyrelaysgrp {
+		fsl,pins =
+			<MX8MM_IOMUXC_NAND_DATA02_GPIO3_IO8	0x16>, /* SODIMM 60 */
+			<MX8MM_IOMUXC_NAND_DATA03_GPIO3_IO9	0x16>, /* SODIMM 62 */
+			<MX8MM_IOMUXC_NAND_CE1_B_GPIO3_IO2	0x16>, /* SODIMM 64 */
+			<MX8MM_IOMUXC_NAND_DQS_GPIO3_IO14	0x16>; /* SODIMM 66 */
+	};
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin-nonwifi-ivy.dts b/arch/arm64/boot/dts/freescale/imx8mm-verdin-nonwifi-ivy.dts
new file mode 100644
index 000000000000..82b34a12ee2b
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin-nonwifi-ivy.dts
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright 2024 Toradex
+ */
+
+/dts-v1/;
+
+#include "imx8mm-verdin.dtsi"
+#include "imx8mm-verdin-nonwifi.dtsi"
+#include "imx8mm-verdin-ivy.dtsi"
+
+/ {
+	model = "Toradex Verdin iMX8M Mini on Ivy";
+	compatible = "toradex,verdin-imx8mm-nonwifi-ivy",
+		     "toradex,verdin-imx8mm-nonwifi",
+		     "toradex,verdin-imx8mm",
+		     "fsl,imx8mm";
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin-wifi-ivy.dts b/arch/arm64/boot/dts/freescale/imx8mm-verdin-wifi-ivy.dts
new file mode 100644
index 000000000000..3369ba852b5c
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin-wifi-ivy.dts
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright 2024 Toradex
+ */
+
+/dts-v1/;
+
+#include "imx8mm-verdin.dtsi"
+#include "imx8mm-verdin-wifi.dtsi"
+#include "imx8mm-verdin-ivy.dtsi"
+
+/ {
+	model = "Toradex Verdin iMX8M Mini WB on Ivy";
+	compatible = "toradex,verdin-imx8mm-wifi-ivy",
+		     "toradex,verdin-imx8mm-wifi",
+		     "toradex,verdin-imx8mm",
+		     "fsl,imx8mm";
+};
-- 
2.39.5