drivers: memc: add driver for stm32 ospi psram

Add a driver for STM32 OSPI PSRAM in memory mapped mode.
Enable OSPI PSRAM on b_u585i_iot02a.

Signed-off-by: Mario Paja <mariopaja@hotmail.com>

Author: mariopaja

boards/st/b_u585i_iot02a/b_u585i_iot02a-common.dtsi

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2021 Linaro Limited
  * Copyright (c) 2024 STMicroelectronics
+ * Copyright (c) 2025 ZAL Zentrum für Angewandte Luftfahrtforschung GmbH
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -9,6 +10,7 @@
 #include <st/u5/stm32u585aiixq-pinctrl.dtsi>
 #include "arduino_r3_connector.dtsi"
 #include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <zephyr/dt-bindings/memory-attr/memory-attr-arm.h>
 
 / {
 	leds {
@@ -43,6 +45,13 @@
 		volt-sensor1 = &vbat4;
 		eeprom-0 = &eeprom0;
 	};
+
+	psram: memory@90000000 {
+		compatible = "zephyr,memory-region";
+		reg = <0x90000000 DT_SIZE_M(8)>;
+		zephyr,memory-region = "PSRAM";
+		zephyr,memory-attr = <(DT_MEM_ARM(ATTR_MPU_RAM))>;
+	};
 };
 
 &clk_hsi48 {
@@ -126,6 +135,27 @@ stm32_lp_tick_source: &lptim1 {
 	};
 };
 
+&octospi1 {
+	pinctrl-0 = <&octospim_p1_clk_pb10 &octospim_p1_ncs_pb11
+		     &octospim_p1_io0_pf8 &octospim_p1_io1_pf9
+		     &octospim_p1_io2_pf7 &octospim_p1_io3_pf6
+		     &octospim_p1_io4_ph2 &octospim_p1_io5_pi0
+		     &octospim_p1_io6_pc3 &octospim_p1_io7_pd7
+		     &octospim_p1_dqs_pe3>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	memc: aps6408l: memory@0 {
+		compatible = "st,stm32-ospi-psram";
+		reg = <0>;
+		size = <DT_SIZE_M(64)>; /* 64 Mbits */
+		max-frequency = <DT_FREQ_M(133)>;
+		fixed-latency;
+		burst-length = <3>;
+		status = "okay";
+	};
+};
+
 &octospi2 {
 	pinctrl-0 = <&octospim_p2_clk_pf4 &octospim_p2_ncs_pi5
 		     &octospim_p2_io0_pf0 &octospim_p2_io1_pf1

drivers/memc/CMakeLists.txt

@@ -30,3 +30,4 @@ zephyr_linker_sources_ifdef(CONFIG_MEMC_STM32_SDRAM SECTIONS     memc_stm32_sdra
 
 zephyr_library_sources_ifdef(CONFIG_MEMC_STM32_XSPI_PSRAM        memc_stm32_xspi_psram.c)
 zephyr_linker_sources_ifdef(CONFIG_MEMC_STM32_XSPI_PSRAM SECTIONS memc_stm32_xspi_psram.ld)
+zephyr_library_sources_ifdef(CONFIG_MEMC_STM32_OSPI_PSRAM        memc_stm32_ospi_psram.c)

drivers/memc/Kconfig.stm32

@@ -1,4 +1,5 @@
 # Copyright (c) 2020 Teslabs Engineering S.L.
+# Copyright (c) 2025 ZAL Zentrum für Angewandte Luftfahrtforschung GmbH
 # SPDX-License-Identifier: Apache-2.0
 
 config MEMC_STM32
@@ -40,3 +41,15 @@ config MEMC_STM32_XSPI_PSRAM
 	select PINCTRL
 	help
 	  Enable STM32 XSPI Memory Controller.
+
+config MEMC_STM32_OSPI_PSRAM
+	bool "STM32 OSPI PSRAM"
+	default y
+	depends on DT_HAS_ST_STM32_OSPI_PSRAM_ENABLED
+	select USE_STM32_HAL_OSPI
+	select USE_STM32_LL_DLYB
+	select USE_STM32_HAL_DMA_EX
+	select USE_STM32_HAL_DMA
+	select PINCTRL
+	help
+	  Enable STM32 OSPI PSRAM Controller driver.