soc: st: adds support for stm32u545xx

This adds support for the stm32u545xx SoC, which extends
the stm32u5 family already present in Zephyr.

Signed-off-by: Dan Collins <dan@collinsnz.com>

dts/arm/st/u5/stm32u545.dtsi

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2024 Opito
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <st/u5/stm32u5.dtsi>
+
+
+/ {
+ soc {
+ /* USB-C PD is not available on this part. */
+ /delete-node/ ucpd@4000dc00;
+
+ compatible = "st,stm32u545", "st,stm32u5", "simple-bus";
+
+ usb: usb@40006000 {
+ compatible = "st,stm32-usb";
+ reg = <0x40006000 0x400>;
+ interrupts = <73 0>;
+ interrupt-names = "usb";
+ num-bidir-endpoints = <8>;
+ ram-size = <1024>;
+ status = "disabled";
+ clocks = <&rcc STM32_CLOCK_BUS_APB2 0x01000000>,
+ <&rcc STM32_SRC_HSI48 ICKLK_SEL(0)>;
+ phys = <&usb_fs_phy>;
+ };
+ };
+
+ usb_fs_phy: usb_fs_phy {
+ compatible = "usb-nop-xceiv";
+ #phy-cells = <0>;
+ };
+};

dts/arm/st/u5/stm32u545Xi.dtsi

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2024 Opito
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <mem.h>
+#include <st/u5/stm32u545.dtsi>
+
+/ {
+ sram0: memory@20000000 {
+ /* SRAM1 + SRAM2 */
+ reg = <0x20000000 DT_SIZE_K(256)>;
+ };
+
+ sram1: memory@28000000 {
+ /* SRAM4, low-power background autonomous mode */
+ reg = <0x28000000 DT_SIZE_K(16)>;
+ };
+
+ soc {
+ flash-controller@40022000 {
+ flash0: flash@8000000 {
+ reg = <0x08000000 DT_SIZE_K(512)>;
+ };
+ };
+ };
+};

soc/st/stm32/soc.yml

@@ -190,6 +190,7 @@ family:
  socs:
  - name: stm32u5a5xx
  - name: stm32u5a9xx
+ - name: stm32u545xx
  - name: stm32u575xx
  - name: stm32u585xx
  - name: stm32u595xx

soc/st/stm32/stm32u5x/Kconfig.defconfig.stm32u545xx

@@ -0,0 +1,11 @@
+# ST Microelectronics STM32U545XX MCU
+
+# Copyright (c) 2024 Opito
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32U545XX
+
+config NUM_IRQS
+ default 126
+
+endif # SOC_STM32U545XX

soc/st/stm32/stm32u5x/Kconfig.soc

@@ -12,6 +12,10 @@ config SOC_SERIES_STM32U5X
 config SOC_SERIES
  default "stm32u5x" if SOC_SERIES_STM32U5X
 
+config SOC_STM32U545XX
+ bool
+ select SOC_SERIES_STM32U5X
+
 config SOC_STM32U575XX
  bool
  select SOC_SERIES_STM32U5X
@@ -39,6 +43,7 @@ config SOC_STM32U5A9XX
 config SOC
  default "stm32u5a5xx" if SOC_STM32U5A5XX
  default "stm32u5a9xx" if SOC_STM32U5A9XX
+ default "stm32u545xx" if SOC_STM32U545XX
  default "stm32u575xx" if SOC_STM32U575XX
  default "stm32u585xx" if SOC_STM32U585XX
  default "stm32u595xx" if SOC_STM32U595XX

soc/st/stm32/stm32u5x/soc.c

@@ -40,11 +40,16 @@ void soc_early_init_hook(void)
  /* Enable PWR */
  LL_AHB3_GRP1_EnableClock(LL_AHB3_GRP1_PERIPH_PWR);
 
+ /* For devices with USB C PD, we can disable the dead battery
+ * pull-down behaviour.
+ */
+#if defined(UCPD1)
  if (IS_ENABLED(CONFIG_DT_HAS_ST_STM32_UCPD_ENABLED) ||
  !IS_ENABLED(CONFIG_USB_DEVICE_DRIVER)) {
  /* Disable USB Type-C dead battery pull-down behavior */
  LL_PWR_DisableUCPDDeadBattery();
  }
+#endif
 
  /* Power Configuration */
 #if defined(CONFIG_POWER_SUPPLY_DIRECT_SMPS)