boards: phytec: phyboard_pollux: Add i2C config

Adds I2C Devicetree node configuration for phyBOARD Pollux
on the Coretex-M7 including the boards standard pinmuxing.

Signed-off-by: Peter Fecher <p.fecher@phytec.de>

Author: pefech

boards/phytec/phyboard_pollux/phyboard_pollux-pinctrl.dtsi

@@ -36,4 +36,52 @@
 			drive-strength = "x1";
 		};
 	};
+
+	i2c1_default: i2c1_default {
+		group0 {
+			pinmux = <&iomuxc_i2c1_scl_i2c_scl_i2c1_scl>,
+				<&iomuxc_i2c1_sda_i2c_sda_i2c1_sda>;
+			bias-pull-up;
+			input-schmitt-enable;
+			slew-rate = "slow";
+			drive-strength = "x4";
+			input-enable;
+		};
+	};
+
+	i2c2_default: i2c2_default {
+		group0 {
+			pinmux = <&iomuxc_i2c2_scl_i2c_scl_i2c2_scl>,
+				<&iomuxc_i2c2_sda_i2c_sda_i2c2_sda>;
+			bias-pull-up;
+			input-schmitt-enable;
+			slew-rate = "slow";
+			drive-strength = "x4";
+			input-enable;
+		};
+	};
+
+	i2c3_default: i2c3_default {
+		group0 {
+			pinmux = <&iomuxc_i2c3_scl_i2c_scl_i2c3_scl>,
+				<&iomuxc_i2c3_sda_i2c_sda_i2c3_sda>;
+			bias-pull-up;
+			input-schmitt-enable;
+			slew-rate = "slow";
+			drive-strength = "x4";
+			input-enable;
+		};
+	};
+
+	i2c4_default: i2c4_default {
+		group0 {
+			pinmux = <&iomuxc_i2c4_scl_i2c_scl_i2c4_scl>,
+				<&iomuxc_i2c4_sda_i2c_sda_i2c4_sda>;
+			bias-pull-up;
+			input-schmitt-enable;
+			slew-rate = "slow";
+			drive-strength = "x4";
+			input-enable;
+		};
+	};
 };

boards/phytec/phyboard_pollux/phyboard_pollux_mimx8ml8_m7.dts

@@ -7,6 +7,7 @@
 /dts-v1/;
 
 #include <nxp/nxp_imx8ml_m7.dtsi>
+#include <zephyr/dt-bindings/i2c/i2c.h>
 #include "phyboard_pollux-pinctrl.dtsi"
 
 / {
@@ -63,6 +64,47 @@
 	pinctrl-names = "default";
 };
 
+/*
+ * Has PMIC and EEPROM connected to it.
+ * Used by u-boot and Linux.
+ */
+&i2c1 {
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c1_default>;
+	pinctrl-names = "default";
+};
+
+/*
+ * Has PCA9533 I2C expander and a EEPROM connected.
+ * There is no driver for the PCA9533 in zephyr yet.
+ * Accessible via X6(Expansion header) and X10(mini PCIe).
+ */
+&i2c2 {
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c2_default>;
+	pinctrl-names = "default";
+};
+
+/*
+ * Nothing connected.
+ * Accessible via connector X11 (phyCAM-M).
+ */
+&i2c3 {
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c3_default>;
+	pinctrl-names = "default";
+};
+
+/*
+ * Nothing connected.
+ * Accessible via connector X15(A/V), X24(Display) and X21(MIPI-DSI).
+ */
+&i2c4 {
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	pinctrl-0 = <&i2c4_default>;
+	pinctrl-names = "default";
+};
+
 &mailbox0 {
 	status = "okay";
 };