drivers: pinctrl: pinctrl_gecko: Add support for using pinctrl api

This update integrates I2C support with the pinctrl_configure_pins api
within the pinctrl_gecko driver.

Signed-off-by: Arunmani Alagarsamy <[email protected]>

Author: ArunmaniAlagarsamy2710

drivers/pinctrl/pinctrl_gecko.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2023 Silicon Labs
+ * Copyright (c) 2024 Capgemini
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -18,6 +19,10 @@ int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt, uintp
 	int usart_num = USART_NUM(base);
 #endif
 
+#ifdef CONFIG_I2C_GECKO
+	I2C_TypeDef *i2c_base = (I2C_TypeDef *)reg;
+#endif
+
 #ifdef CONFIG_UART_GECKO
 	struct soc_gpio_pin rxpin = {0, 0, 0, 0};
 	struct soc_gpio_pin txpin = {0, 0, 0, 0};
@@ -277,6 +282,54 @@ int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt, uintp
 #endif /* CONFIG_SOC_FAMILY_SILABS_S1 */
 #endif /* CONFIG_SPI_GECKO */
 
+#ifdef CONFIG_I2C_GECKO
+		case GECKO_FUN_I2C_SDA:
+			pin_config.mode = gpioModeWiredAnd;
+			pin_config.out = 1;
+			GPIO_PinModeSet(pin_config.port, pin_config.pin, pin_config.mode,
+				pin_config.out);
+
+			break;
+
+		case GECKO_FUN_I2C_SCL:
+			pin_config.mode = gpioModeWiredAnd;
+			pin_config.out = 1;
+			GPIO_PinModeSet(pin_config.port, pin_config.pin, pin_config.mode,
+				pin_config.out);
+			break;
+
+		case GECKO_FUN_I2C_SDA_LOC:
+#ifdef CONFIG_SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
+			i2c_base->ROUTEPEN |= I2C_ROUTEPEN_SDAPEN;
+			i2c_base->ROUTELOC0 &= ~_I2C_ROUTELOC0_SDALOC_MASK;
+			i2c_base->ROUTELOC0 |= (loc << _I2C_ROUTELOC0_SDALOC_SHIFT);
+#elif defined(GPIO_I2C_ROUTEEN_SCLPEN) && defined(GPIO_I2C_ROUTEEN_SDAPEN)
+			GPIO->I2CROUTE[I2C_NUM(i2c_base)].ROUTEEN |= GPIO_I2C_ROUTEEN_SDAPEN;
+			GPIO->I2CROUTE[I2C_NUM(i2c_base)].SDAROUTE =
+				(pin_config.pin << _GPIO_I2C_SDAROUTE_PIN_SHIFT) |
+				(pin_config.port << _GPIO_I2C_SDAROUTE_PORT_SHIFT);
+#else
+			i2c_base->ROUTE = I2C_ROUTE_SDAPEN | I2C_ROUTE_SCLPEN | (loc << 8);
+#endif
+			break;
+
+		case GECKO_FUN_I2C_SCL_LOC:
+#ifdef CONFIG_SOC_GECKO_HAS_INDIVIDUAL_PIN_LOCATION
+			i2c_base->ROUTEPEN |= I2C_ROUTEPEN_SCLPEN;
+			i2c_base->ROUTELOC0 &= ~_I2C_ROUTEPEN_SCLPEN_MASK;
+			i2c_base->ROUTELOC0 |= (loc << _I2C_ROUTELOC0_SCLLOC_SHIFT);
+#elif defined(GPIO_I2C_ROUTEEN_SCLPEN) && defined(GPIO_I2C_ROUTEEN_SDAPEN)
+			GPIO->I2CROUTE[I2C_NUM(i2c_base)].ROUTEEN |= GPIO_I2C_ROUTEEN_SCLPEN;
+			GPIO->I2CROUTE[I2C_NUM(i2c_base)].SCLROUTE =
+				(pin_config.pin << _GPIO_I2C_SCLROUTE_PIN_SHIFT) |
+				(pin_config.port << _GPIO_I2C_SCLROUTE_PORT_SHIFT);
+#else
+			i2c_base->ROUTE = I2C_ROUTE_SDAPEN | I2C_ROUTE_SCLPEN | (loc << 8);
+#endif
+			break;
+
+#endif /* CONFIG_I2C_GECKO */
+
 		default:
 			return -ENOTSUP;
 		}

include/zephyr/dt-bindings/pinctrl/gecko-pinctrl-s1.h

@@ -85,6 +85,11 @@
 #define GECKO_FUN_SPI_CS_LOC  20U
 #define GECKO_FUN_SPI_SCK_LOC  21U
 
+#define GECKO_FUN_I2C_SDA 22U
+#define GECKO_FUN_I2C_SCL 23U
+#define GECKO_FUN_I2C_SDA_LOC 24U
+#define GECKO_FUN_I2C_SCL_LOC 25U
+
 
 /** @} */
 

include/zephyr/dt-bindings/pinctrl/gecko-pinctrl.h

@@ -66,6 +66,11 @@
 #define GECKO_FUN_SPI_CSN  7U
 #define GECKO_FUN_SPI_SCK  8U
 
+#define GECKO_FUN_I2C_SDA 9U
+#define GECKO_FUN_I2C_SCL 10U
+#define GECKO_FUN_I2C_SDA_LOC 11U
+#define GECKO_FUN_I2C_SCL_LOC 12U
+
 /** @} */
 
 /**