drivers: spi: gecko: add new driver for SPI communication via EUSART

Added a new driver to support SPI communication via EUSART. Since the
Silabs EFR32MG24 family SoCs have only one USART, EUSART support is
necessary for implementing SPI functionality.

Signed-off-by: Teresa Zepeda Ventura <teresa.zvent@gmail.com>

drivers/pinctrl/pinctrl_gecko.c

@@ -24,6 +24,11 @@ int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt, uintp
 	(void)base;
 #endif /*USART_COUNT > 1*/
 
+#ifdef CONFIG_SPI_GECKO_EUSART
+	EUSART_TypeDef *ebase = (EUSART_TypeDef *)reg;
+	int eusart_num = EUSART_NUM(ebase);
+#endif
+
 #endif
 
 #ifdef CONFIG_I2C_GECKO
@@ -171,7 +176,53 @@ int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt, uintp
 #endif /* CONFIG_SOC_FAMILY_SILABS_S1 */
 #endif /* CONFIG_UART_GECKO */
 
-#ifdef CONFIG_SPI_GECKO
+#ifdef CONFIG_SPI_GECKO_EUSART
+		case GECKO_FUN_SPI_SCK:
+			pin_config.mode = gpioModePushPull;
+			pin_config.out = 1;
+			GPIO->EUSARTROUTE[eusart_num].SCLKROUTE =
+				(pin_config.port << _GPIO_EUSART_SCLKROUTE_PORT_SHIFT) |
+				(pin_config.pin << _GPIO_EUSART_SCLKROUTE_PIN_SHIFT);
+			GPIO->EUSARTROUTE[eusart_num].ROUTEEN |= GPIO_EUSART_ROUTEEN_SCLKPEN;
+			GPIO_PinModeSet(pin_config.port, pin_config.pin, pin_config.mode,
+					pin_config.out);
+			break;
+
+		case GECKO_FUN_SPI_CSN:
+			pin_config.mode = gpioModePushPull;
+			pin_config.out = 1;
+			GPIO->EUSARTROUTE[eusart_num].CSROUTE =
+				(pin_config.port << _GPIO_EUSART_CSROUTE_PORT_SHIFT) |
+				(pin_config.pin << _GPIO_EUSART_CSROUTE_PIN_SHIFT);
+			GPIO->EUSARTROUTE[eusart_num].ROUTEEN |= GPIO_EUSART_ROUTEEN_CSPEN;
+			GPIO_PinModeSet(pin_config.port, pin_config.pin, pin_config.mode,
+					pin_config.out);
+			break;
+
+		case GECKO_FUN_SPI_MOSI:
+			pin_config.mode = gpioModePushPull;
+			pin_config.out = 1;
+			GPIO->EUSARTROUTE[eusart_num].TXROUTE =
+				(pin_config.port << _GPIO_EUSART_TXROUTE_PORT_SHIFT) |
+				(pin_config.pin << _GPIO_EUSART_TXROUTE_PIN_SHIFT);
+			GPIO->EUSARTROUTE[eusart_num].ROUTEEN |= GPIO_EUSART_ROUTEEN_TXPEN;
+			GPIO_PinModeSet(pin_config.port, pin_config.pin, pin_config.mode,
+					pin_config.out);
+			break;
+
+		case GECKO_FUN_SPI_MISO:
+			pin_config.mode = gpioModeInput;
+			pin_config.out = 1;
+			GPIO->EUSARTROUTE[eusart_num].RXROUTE =
+				(pin_config.port << _GPIO_EUSART_RXROUTE_PORT_SHIFT) |
+				(pin_config.pin << _GPIO_EUSART_RXROUTE_PIN_SHIFT);
+			GPIO->EUSARTROUTE[EUSART_NUM(EUSART1)].ROUTEEN |= GPIO_EUSART_ROUTEEN_RXPEN;
+			GPIO_PinModeSet(pin_config.port, pin_config.pin, pin_config.mode,
+					pin_config.out);
+			break;
+#endif /*CONFIG_SPI_GECKO_EUSART*/
+
+#ifdef CONFIG_SPI_GECKO_USART
 #ifdef CONFIG_SOC_FAMILY_SILABS_S1
 		case GECKO_FUN_SPIM_SCK:
 			pin_config.mode = gpioModePushPull;
@@ -287,7 +338,7 @@ int pinctrl_configure_pins(const pinctrl_soc_pin_t *pins, uint8_t pin_cnt, uintp
 					pin_config.out);
 			break;
 #endif /* CONFIG_SOC_FAMILY_SILABS_S1 */
-#endif /* CONFIG_SPI_GECKO */
+#endif /* CONFIG_SPI_GECKO_USART */
 
 #ifdef CONFIG_I2C_GECKO
 		case GECKO_FUN_I2C_SDA:

drivers/spi/CMakeLists.txt

@@ -28,7 +28,8 @@ zephyr_library_sources_ifdef(CONFIG_SPI_LITEX		spi_litex.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_LITEX_LITESPI	spi_litex_litespi.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_OC_SIMPLE	spi_oc_simple.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_XEC_QMSPI	spi_xec_qmspi.c)
-zephyr_library_sources_ifdef(CONFIG_SPI_GECKO		spi_gecko.c)
+zephyr_library_sources_ifdef(CONFIG_SPI_GECKO_USART		spi_gecko_usart.c)
+zephyr_library_sources_ifdef(CONFIG_SPI_GECKO_EUSART	spi_gecko_eusart.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_XLNX_AXI_QUADSPI spi_xlnx_axi_quadspi.c)
 zephyr_library_sources_ifdef(CONFIG_ESP32_SPIM		spi_esp32_spim.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_TEST		spi_test.c)

drivers/spi/Kconfig

@@ -111,7 +111,9 @@ source "drivers/spi/Kconfig.oc_simple"
 
 source "drivers/spi/Kconfig.xec_qmspi"
 
-source "drivers/spi/Kconfig.gecko"
+source "drivers/spi/Kconfig.gecko_usart"
+
+source "drivers/spi/Kconfig.gecko_eusart"
 
 source "drivers/spi/Kconfig.xlnx"
 

drivers/spi/Kconfig.gecko_eusart

@@ -0,0 +1,13 @@
+# Gecko SPI configuration option
+
+# Copyright (c) 2024 Daikin Comfort Technologies North America, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config SPI_GECKO_EUSART
+	bool "Gecko EUSART SPI controller driver"
+	default y
+	depends on DT_HAS_SILABS_GECKO_SPI_EUSART_ENABLED
+	depends on GPIO
+	select SOC_GECKO_EUSART
+	help
+	  Enable the EUSART SPI peripherals on Gecko

drivers/spi/Kconfig.gecko → drivers/spi/Kconfig.gecko_usart

@@ -3,7 +3,7 @@
 # Copyright (c) 2019 Christian Taedcke <hacking@taedcke.com>
 # SPDX-License-Identifier: Apache-2.0
 
-config SPI_GECKO
+config SPI_GECKO_USART
 	bool "Gecko SPI controller driver"
 	default y
 	depends on DT_HAS_SILABS_GECKO_SPI_USART_ENABLED