boards: st: stm32l152c_disco: add board support

The STM32L152C-DISCOVERY is a development board based on the STM32L152RC
MCU. It is very similar to the stm32l1_disco, which was used as a
reference for the pinmux and defconfig.

stm32l152c_disco board has 256 Kbytes of flash memory, 32 Kbytes of RAM
and 8 Kbytes of data EEPROM.

Signed-off-by: Maxin John <maxin.john@gmail.com>

boards/st/stm32l1_disco/Kconfig.stm32l152c_disco

@@ -0,0 +1,5 @@
+# Copyright (c) 2024 Maxin John
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_STM32L152C_DISCO
+	select SOC_STM32L152XC

boards/st/stm32l1_disco/board.yml

@@ -1,5 +1,9 @@
-board:
-  name: stm32l1_disco
+boards:
+  - name: stm32l1_disco
     vendor: st
     socs:
       - name: stm32l151xb
+  - name: stm32l152c_disco
+    vendor: st
+    socs:
+      - name: stm32l152xc

boards/st/stm32l1_disco/stm32l152c_disco.dts

@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2024 Maxin John
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <st/l1/stm32l152Xc.dtsi>
+#include <st/l1/stm32l152r(6-8-b)tx-pinctrl.dtsi>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	model = "STMicroelectronics STM32L152CDISCOVERY board";
+	compatible = "st,stm32l1discovery";
+
+	chosen {
+		zephyr,console = &usart1;
+		zephyr,shell-uart = &usart1;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		green_led: ld3 {
+			gpios = <&gpiob 7 GPIO_ACTIVE_HIGH>;
+			label = "User LD3";
+		};
+		blue_led: ld4 {
+			gpios = <&gpiob 6 GPIO_ACTIVE_HIGH>;
+			label = "User LD4";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		user_button: button {
+			label = "User";
+			gpios = <&gpioa 0 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+
+	aliases {
+		led0 = &green_led;
+		led1 = &blue_led;
+		sw0 = &user_button;
+	};
+};
+
+&clk_lsi {
+	status = "okay";
+};
+
+&clk_hsi {
+	status = "okay";
+};
+
+&pll {
+	div = <4>;
+	mul = <8>;
+	/* out of the box, MCO from stlink is not enabled, unlike later discos */
+	clocks = <&clk_hsi>;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(32)>;
+	ahb-prescaler = <1>;
+	apb1-prescaler = <1>;
+	apb2-prescaler = <1>;
+};
+
+&usart1 {
+	pinctrl-0 = <&usart1_tx_pa9 &usart1_rx_pa10>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&usart2 {
+	pinctrl-0 = <&usart2_tx_pa2 &usart2_rx_pa3>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&usart3 {
+	pinctrl-0 = <&usart3_tx_pb10 &usart3_rx_pb11>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&i2c1 {
+	pinctrl-0 = <&i2c1_scl_pb6 &i2c1_sda_pb7>;
+	pinctrl-names = "default";
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_FAST>;
+};
+
+&i2c2 {
+	pinctrl-0 = <&i2c2_scl_pb10 &i2c2_sda_pb11>;
+	pinctrl-names = "default";
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_FAST>;
+};
+
+&spi1 {
+	pinctrl-0 = <&spi1_nss_pa4 &spi1_sck_pa5
+		     &spi1_miso_pa6 &spi1_mosi_pa7>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&spi2 {
+	pinctrl-0 = <&spi2_nss_pb12 &spi2_sck_pb13
+		     &spi2_miso_pb14 &spi2_mosi_pb15>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&rtc {
+	clocks = <&rcc STM32_CLOCK_BUS_APB1 0x10000000>,
+		 <&rcc STM32_SRC_LSI RTC_SEL(2)>;
+	status = "okay";
+
+	backup_regs {
+		status = "okay";
+	};
+};

boards/st/stm32l1_disco/stm32l152c_disco.yaml

@@ -0,0 +1,15 @@
+identifier: stm32l152c_disco
+name: ST STM32L152C Discovery
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+ram: 32
+flash: 256
+supported:
+  - gpio
+  - i2c
+  - spi
+vendor: st

boards/st/stm32l1_disco/stm32l152c_disco_defconfig

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: Apache-2.0
+
+# enable uart driver
+CONFIG_SERIAL=y
+
+# enable console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# enable GPIO
+CONFIG_GPIO=y
+
+# Enable Clocks
+CONFIG_CLOCK_CONTROL=y
+
+# enable pin controller
+CONFIG_PINCTRL=y