drivers: adc: adc_ti_am335x: add support for pinctrl

Support configuration of pins for ADC channels in the driver.

Signed-off-by: Amneesh Singh <[email protected]>

Author: natto1784

drivers/adc/adc_ti_am335x.c

@@ -8,6 +8,7 @@
 #include <zephyr/device.h>
 #include <zephyr/kernel.h>
 #include <zephyr/drivers/adc.h>
+#include <zephyr/drivers/pinctrl.h>
 
 #define ADC_CONTEXT_USES_KERNEL_TIMER
 #include "adc_context.h"
@@ -97,6 +98,7 @@ enum ti_adc_irq {
 
 struct ti_adc_cfg {
 	DEVICE_MMIO_ROM;
+	const struct pinctrl_dev_config *pinctrl;
 	void (*irq_func)(const struct device *dev);
 	uint32_t open_delay[TI_ADC_TOTAL_CHANNELS];
 	uint8_t oversampling[TI_ADC_TOTAL_CHANNELS];
@@ -293,10 +295,19 @@ static int ti_adc_init(const struct device *dev)
 {
 	const struct ti_adc_cfg *cfg = DEV_CFG(dev);
 	struct ti_adc_data *data = DEV_DATA(dev);
-	struct ti_adc_regs *regs = DEV_REGS(dev);
+	struct ti_adc_regs *regs;
+	int ret;
 
 	DEVICE_MMIO_MAP(dev, K_MEM_CACHE_NONE);
 
+	regs = DEV_REGS(dev);
+
+	ret = pinctrl_apply_state(cfg->pinctrl, PINCTRL_STATE_DEFAULT);
+	if (ret < 0) {
+		LOG_ERR("failed to apply pinctrl");
+		return ret;
+	}
+
 	cfg->irq_func(dev);
 
 	if (cfg->fifo == 0) {
@@ -384,6 +395,7 @@ static DEVICE_API(adc, ti_adc_driver_api) = {
 };
 
 #define TI_ADC_INIT(n)                                                                             \
+	PINCTRL_DT_INST_DEFINE(n);                                                                 \
 	static void ti_adc_irq_setup_##n(const struct device *dev)                                 \
 	{                                                                                          \
 		IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority), ti_adc_isr,                 \
@@ -393,6 +405,7 @@ static DEVICE_API(adc, ti_adc_driver_api) = {
                                                                                                    \
 	static const struct ti_adc_cfg ti_adc_cfg_##n = {                                          \
 		DEVICE_MMIO_ROM_INIT(DT_DRV_INST(n)),                                              \
+		.pinctrl = PINCTRL_DT_INST_DEV_CONFIG_GET(n),                                      \
 		.irq_func = &ti_adc_irq_setup_##n,                                                 \
 		.open_delay = CHAN_PROP_LIST(n, ti_open_delay),                                    \
 		.oversampling = CHAN_PROP_LIST(n, zephyr_oversampling),                            \

dts/bindings/adc/ti,am335x-adc.yaml

@@ -6,7 +6,7 @@ description: TI AM335X ADC
 
 compatible: "ti,am335x-adc"
 
-include: [adc-controller.yaml]
+include: [adc-controller.yaml, pinctrl-device.yaml]
 
 properties:
   interrupts: