refactor(boards): Switch proton_c to newer pinmux approach.

See: https://github.com/zephyrproject-rtos/zephyr/issues/28999
PR: https://github.com/zmkfirmware/zmk/pull/736

app/boards/arm/proton_c/CMakeLists.txt

@@ -1,7 +0,0 @@
-# SPDX-License-Identifier: MIT
-
-if(CONFIG_PINMUX)
-zephyr_library()
-zephyr_library_sources(pinmux.c)
-zephyr_library_include_directories(${ZEPHYR_BASE}/drivers)
-endif()

app/boards/arm/proton_c/arduino_pro_micro_pins.dtsi

@@ -48,5 +48,5 @@
 };
 
 pro_micro_i2c: &i2c1 {};
-pro_micro_spi: &spi1 {};
+pro_micro_spi: &spi2 {};
 pro_micro_serial: &usart1 {};

app/boards/arm/proton_c/pinmux.c

@@ -1,67 +0,0 @@
-/*
- * Copyright (c) 2017 I-SENSE group of ICCS
- *
- * SPDX-License-Identifier: MIT
- */
-
-#include <kernel.h>
-#include <device.h>
-#include <init.h>
-#include <drivers/pinmux.h>
-#include <sys/sys_io.h>
-
-#include <pinmux/stm32/pinmux_stm32.h>
-
-/* pin assignments for STM32F3DISCOVERY board */
-static const struct pin_config pinconf[] = {
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(usart1), okay) && CONFIG_SERIAL
-    {STM32_PIN_PC4, STM32F3_PINMUX_FUNC_PC4_USART1_TX},
-    {STM32_PIN_PC5, STM32F3_PINMUX_FUNC_PC5_USART1_RX},
-#endif
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(usart2), okay) && CONFIG_SERIAL
-    {STM32_PIN_PA2, STM32F3_PINMUX_FUNC_PA2_USART2_TX},
-    {STM32_PIN_PA3, STM32F3_PINMUX_FUNC_PA3_USART2_RX},
-#endif
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(i2c1), okay) && CONFIG_I2C
-    {STM32_PIN_PB6, STM32F3_PINMUX_FUNC_PB6_I2C1_SCL},
-    {STM32_PIN_PB7, STM32F3_PINMUX_FUNC_PB7_I2C1_SDA},
-#endif
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(i2c2), okay) && CONFIG_I2C
-    {STM32_PIN_PA9, STM32F3_PINMUX_FUNC_PA9_I2C2_SCL},
-    {STM32_PIN_PA10, STM32F3_PINMUX_FUNC_PA10_I2C2_SDA},
-#endif
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(spi1), okay) && CONFIG_SPI
-#ifdef CONFIG_SPI_STM32_USE_HW_SS
-    {STM32_PIN_PA4, STM32F3_PINMUX_FUNC_PA4_SPI1_NSS},
-#endif /* CONFIG_SPI_STM32_USE_HW_SS */
-    {STM32_PIN_PA5, STM32F3_PINMUX_FUNC_PA5_SPI1_SCK},
-    {STM32_PIN_PA6, STM32F3_PINMUX_FUNC_PA6_SPI1_MISO},
-    {STM32_PIN_PA7, STM32F3_PINMUX_FUNC_PA7_SPI1_MOSI},
-#endif
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(spi2), okay) && CONFIG_SPI
-#ifdef CONFIG_SPI_STM32_USE_HW_SS
-    {STM32_PIN_PB12, STM32F3_PINMUX_FUNC_PB12_SPI2_NSS},
-#endif /* CONFIG_SPI_STM32_USE_HW_SS */
-    {STM32_PIN_PB13, STM32F3_PINMUX_FUNC_PB13_SPI2_SCK},
-    {STM32_PIN_PB14, STM32F3_PINMUX_FUNC_PB14_SPI2_MISO},
-    {STM32_PIN_PB15, STM32F3_PINMUX_FUNC_PB15_SPI2_MOSI},
-#endif
-#ifdef CONFIG_USB_DC_STM32
-    {STM32_PIN_PA11, STM32F3_PINMUX_FUNC_PA11_USB_DM},
-    {STM32_PIN_PA12, STM32F3_PINMUX_FUNC_PA12_USB_DP},
-#endif /* CONFIG_USB_DC_STM32 */
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(can1), okay) && CONFIG_CAN
-    {STM32_PIN_PD0, STM32F3_PINMUX_FUNC_PD0_CAN1_RX},
-    {STM32_PIN_PD1, STM32F3_PINMUX_FUNC_PD1_CAN1_TX},
-#endif
-};
-
-static int pinmux_stm32_init(const struct device *port) {
-    ARG_UNUSED(port);
-
-    stm32_setup_pins(pinconf, ARRAY_SIZE(pinconf));
-
-    return 0;
-}
-
-SYS_INIT(pinmux_stm32_init, PRE_KERNEL_1, CONFIG_PINMUX_STM32_DEVICE_INITIALIZATION_PRIORITY);

app/boards/arm/proton_c/proton_c.dts

@@ -6,6 +6,7 @@
 
 /dts-v1/;
 #include <st/f3/stm32f303Xc.dtsi>
+#include <st/f3/stm32f303c(b-c)tx-pinctrl.dtsi>
 #include "arduino_pro_micro_pins.dtsi"
 
 / {
@@ -26,6 +27,18 @@
 	};
 };
 
+&usart1 {
+	pinctrl-0 = <&usart1_tx_pa9 &usart1_rx_pa10>;
+};
+
+&spi2 {
+	pinctrl-0 = <&spi2_sck_pb13 &spi2_miso_pb14 &spi2_mosi_pb15>;
+};
+
+&i2c1 {
+	pinctrl-0 = <&i2c1_scl_pb6 &i2c1_sda_pb7>;
+};
+
 &usb {
 	status = "okay";
 };