boards: imx93_evk: add board.c to control board muxes

i.MX 93 EVK has a series of digital MUXes controlled by ADP5585 GPIO
expander. This commit adds board level initialization to such MUXes to
control these MUXes.

Signed-off-by: Chekhov Ma <chekhov.ma@nxp.com>

boards/nxp/imx93_evk/CMakeLists.txt

@@ -1 +1,4 @@
 # SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+zephyr_library_sources(board.c)

boards/nxp/imx93_evk/Kconfig

@@ -0,0 +1,16 @@
+# i.MX 93 EVK board configuration
+
+# Copyright 2024 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_MIMX93_EVK_EXP_SEL_INIT
+	bool "Configure i.MX 93 EVK board mux control during init"
+	default n
+
+config BOARD_MIMX93_EVK_EXP_SEL_INIT_PRIO
+	int "i.MX 93 EVK board mux control init priority"
+	default 60
+
+module = BOARD_MIMX93_EVK
+module-str = Board Control
+source "subsys/logging/Kconfig.template.log_config"

boards/nxp/imx93_evk/Kconfig.defconfig

@@ -5,6 +5,20 @@ if BOARD_IMX93_EVK
 
 if BOARD_IMX93_EVK_MIMX9352_A55
 
+if BOARD_MIMX93_EVK_EXP_SEL_INIT
+
+# Enable I2C, MFD, MFD_APD5585 and GPIO_ADP5585
+config GPIO
+	default y
+
+config MFD_ADP5585_INIT_PRIORITY
+	default 55
+
+config GPIO_ADP5585_INIT_PRIORITY
+	default 56
+
+endif # BOARD_MIMX93_EVK_EXP_SEL_INIT
+
 if NETWORKING
 
 config NET_L2_ETHERNET

boards/nxp/imx93_evk/board.c

@@ -0,0 +1,60 @@
+/**
+ * Copyright 2024 NXP
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/init.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/logging/log.h>
+#include <zephyr/drivers/gpio.h>
+
+LOG_MODULE_REGISTER(board_control, CONFIG_BOARD_MIMX93_EVK_LOG_LEVEL);
+
+#if DT_HAS_COMPAT_STATUS_OKAY(imx93evk_exp_sel) && \
+	IS_ENABLED(CONFIG_BOARD_MIMX93_EVK_EXP_SEL_INIT)
+
+#define BOARD_EXP_SEL_NODE DT_COMPAT_GET_ANY_STATUS_OKAY(imx93evk_exp_sel)
+
+#define BOARD_EXP_SEL_MUX_A (0U)
+#define BOARD_EXP_SEL_MUX_B (1U)
+
+static int board_init_exp_sel(void)
+{
+	int rc = 0;
+	const struct gpio_dt_spec mux =
+		GPIO_DT_SPEC_GET(BOARD_EXP_SEL_NODE, mux_gpios);
+	uint32_t pin_state = DT_ENUM_IDX(BOARD_EXP_SEL_NODE, mux);
+
+	if (!gpio_is_ready_dt(&mux)) {
+		LOG_ERR("EXP_SEL Pin port is not ready");
+		return -ENODEV;
+	}
+
+#if defined(CONFIG_CAN)
+	if (pin_state != BOARD_EXP_SEL_MUX_A) {
+		LOG_WRN("CAN is enabled, EXP_SEL overrides to A");
+		pin_state = BOARD_EXP_SEL_MUX_A;
+	}
+#endif /* CONFIG_CAN */
+
+	rc = gpio_pin_configure_dt(&mux, pin_state);
+	if (rc) {
+		LOG_ERR("Write EXP_SEL Pin error %d", rc);
+		return rc;
+	}
+	LOG_INF("EXP_SEL mux %c with priority %d",
+		pin_state ? 'B' : 'A',
+		CONFIG_BOARD_MIMX93_EVK_EXP_SEL_INIT_PRIO
+	);
+
+	return 0;
+}
+
+SYS_INIT(board_init_exp_sel, POST_KERNEL, CONFIG_BOARD_MIMX93_EVK_EXP_SEL_INIT_PRIO);
+
+#endif
+/*
+ * DT_HAS_COMPAT_STATUS_OKAY(imx93evk_exp_sel) && \
+ * IS_ENABLED(CONFIG_BOARD_MIMX93_EVK_EXP_SEL_INIT)
+ */

boards/nxp/imx93_evk/dts/bindings/imx93evk-exp-sel.yaml

@@ -0,0 +1,25 @@
+# Copyright 2024 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+  The i.MX 93 EVK boards has a series of MUXes that selects between 2 pin
+  functions. They are controlled by EXP_SEL signal from gpio_exp0, an
+  ADP5585 GPIO expander.
+
+compatible: "imx93evk-exp-sel"
+
+include: base.yaml
+
+properties:
+  mux-gpios:
+    type: phandle-array
+    required: true
+    description: Pin used to select the MUX
+
+  mux:
+    type: string
+    required: true
+    enum:
+      - "A"
+      - "B"
+    description: MUX choice

boards/nxp/imx93_evk/imx93_evk_mimx9352_a55.dts

@@ -64,6 +64,12 @@
 			gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
 		};
 	};
+
+	board_exp_sel: board-exp-sel {
+		compatible = "imx93evk-exp-sel";
+		mux-gpios = <&gpio_exp0 4 GPIO_ACTIVE_HIGH>;
+		mux = "A";
+	};
 };
 
 &enet {
@@ -115,7 +121,7 @@
 };
 
 &lpi2c2 {
-	status = "disabled";
+	status = "okay";
 	clock-frequency = <I2C_BITRATE_FAST>;
 	pinctrl-0 = <&i2c2_default>;
 	pinctrl-names = "default";
@@ -123,7 +129,7 @@
 	mfd0:adp5585@34 {
 		compatible = "adi,adp5585";
 		reg = <0x34>;
-		status = "disabled";
+		status = "okay";
 
 		gpio_exp0: adp5585_gpio {
 			compatible = "adi,adp5585-gpio";
@@ -131,19 +137,12 @@
 			#gpio-cells = <2>;
 			ngpios = <13>;
 			gpio-reserved-ranges = <5 3>;
+			status = "okay";
 			/*
 			 * This device has non-contiguous gpio range:
 			 *   GPIO Pin R0~R4 are gpio0~4
 			 *   GPIO Pin C0~C4 are gpio8~12
 			 */
-
-			gpiohog_exp_sel: exp-sel-hog {
-				gpio-hog;
-				gpios = <4 GPIO_ACTIVE_HIGH>;
-				line-name = "exp_sel";
-				output-low;
-			};
-			status = "disabled";
 		};
 	};
 };