drivers: eeprom: add support for Microchip ATECC608

Add support for Microchip ATECC608 EEPROM and
ATECC508 EEPROM.

Signed-off-by: Fin Maaß <f.maass@vogl-electronic.com>

drivers/eeprom/CMakeLists.txt

@@ -19,3 +19,5 @@ zephyr_library_sources_ifdef(CONFIG_EEPROM_FAKE eeprom_fake.c)
 zephyr_library_sources_ifdef(CONFIG_EEPROM_AT2X_EMUL eeprom_at2x_emul.c)
 
 zephyr_library_sources_ifdef(CONFIG_EEPROM_MB85RCXX eeprom_mb85rcxx.c)
+
+zephyr_library_sources_ifdef(CONFIG_EEPROM_ATECCX08_OTP eeprom_ateccx08_otp.c)

drivers/eeprom/Kconfig

@@ -99,6 +99,7 @@ source "drivers/eeprom/Kconfig.eeprom_emu"
 source "drivers/eeprom/Kconfig.tmp116"
 source "drivers/eeprom/Kconfig.xec"
 source "drivers/eeprom/Kconfig.mb85rcxx"
+source "drivers/eeprom/Kconfig.ateccx08"
 
 config EEPROM_SIMULATOR
 	bool "Simulated EEPROM driver"

drivers/eeprom/Kconfig.ateccx08

@@ -0,0 +1,19 @@
+# Microchip ATECCx08 eeprom driver configuration
+
+# Copyright (c) 2024 Vogl Electronic GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+config EEPROM_ATECCX08_OTP
+	bool "Microchip ATECCx08 otp eeprom driver"
+	default y
+	depends on DT_HAS_MICROCHIP_ATECCX08_OTP_ENABLED
+	depends on MFD_ATECCX08
+	help
+	  This option enables the Microchip ATECCx08 otp eeprom driver.
+
+config EEPROM_ATECCX08_OTP_INIT_PRIORITY
+	int "Microchip ATECCx08 otp eeprom driver initialization priority"
+	default MFD_ATECCX08_SUBDEVICE_INIT_PRIORITY
+	depends on EEPROM_ATECCX08_OTP
+	help
+	  Microchip ATECCx08 otp eeprom device initialization priority.

drivers/eeprom/eeprom_ateccx08_otp.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2024 Vogl Electronic GmbH
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief Driver for Microchip ATECCX08 I2C EEPROMs.
+ */
+
+#define DT_DRV_COMPAT microchip_ateccx08_otp
+
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/mfd/ateccx08.h>
+#include <zephyr/drivers/eeprom.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(ateccx08_otp, CONFIG_EEPROM_LOG_LEVEL);
+
+struct eeprom_ateccx08_config {
+	const struct device *parent;
+	bool readonly;
+};
+
+static size_t eeprom_ateccx08_size(const struct device *dev)
+{
+	ARG_UNUSED(dev);
+
+	return atecc_get_zone_size(ATECC_ZONE_OTP, 0);
+}
+
+static int eeprom_ateccx08_write(const struct device *dev, off_t offset, const void *data,
+				 size_t len)
+{
+	const struct eeprom_ateccx08_config *cfg = dev->config;
+
+	if (cfg->readonly) {
+		LOG_ERR("attempt to write to read-only device");
+		return -EACCES;
+	}
+
+	return atecc_write_bytes(cfg->parent, ATECC_ZONE_OTP, 0, offset, data, len);
+}
+
+static int eeprom_ateccx08_read(const struct device *dev, off_t offset, void *data, size_t len)
+{
+	const struct eeprom_ateccx08_config *cfg = dev->config;
+
+	return atecc_read_bytes(cfg->parent, ATECC_ZONE_OTP, 0, offset, data, len);
+}
+
+static int eeprom_ateccx08_init(const struct device *dev)
+{
+	const struct eeprom_ateccx08_config *cfg = dev->config;
+
+	if (!device_is_ready(cfg->parent)) {
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static const struct eeprom_driver_api eeprom_ateccx08_driver_api = {
+	.read = &eeprom_ateccx08_read,
+	.write = &eeprom_ateccx08_write,
+	.size = &eeprom_ateccx08_size,
+};
+
+BUILD_ASSERT(CONFIG_EEPROM_ATECCX08_OTP_INIT_PRIORITY >= CONFIG_MFD_ATECCX08_INIT_PRIORITY,
+	     "ATECCX08 EEPROM driver must be initialized after the mfd driver");
+
+#define DEFINE_ATECCX08_OTP(_num)                                                                  \
+	static const struct eeprom_ateccx08_config eeprom_ateccx08_config##_num = {                \
+		.parent = DEVICE_DT_GET(DT_INST_BUS(_num)),                                        \
+		.readonly = DT_INST_PROP(_num, read_only)};                                        \
+	DEVICE_DT_INST_DEFINE(_num, eeprom_ateccx08_init, NULL, NULL,                              \
+			      &eeprom_ateccx08_config##_num, POST_KERNEL,                          \
+			      CONFIG_EEPROM_ATECCX08_OTP_INIT_PRIORITY,                            \
+			      &eeprom_ateccx08_driver_api);
+
+DT_INST_FOREACH_STATUS_OKAY(DEFINE_ATECCX08_OTP);

drivers/mfd/CMakeLists.txt

@@ -16,3 +16,5 @@ zephyr_library_sources_ifdef(CONFIG_MFD_MAX31790 mfd_max31790.c)
 zephyr_library_sources_ifdef(CONFIG_NXP_LP_FLEXCOMM mfd_nxp_lp_flexcomm.c)
 zephyr_library_sources_ifdef(CONFIG_MFD_BD8LB600FS mfd_bd8lb600fs.c)
 zephyr_library_sources_ifdef(CONFIG_MFD_TLE9104 mfd_tle9104.c)
+
+add_subdirectory_ifdef(CONFIG_MFD_ATECCX08 ateccx08)

drivers/mfd/Kconfig

@@ -30,4 +30,6 @@ source "drivers/mfd/Kconfig.npm6001"
 source "drivers/mfd/Kconfig.lpflexcomm"
 source "drivers/mfd/Kconfig.tle9104"
 
+source "drivers/mfd/ateccx08/Kconfig"
+
 endif # MFD

drivers/mfd/ateccx08/CMakeLists.txt

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library_sources(mfd_ateccx08.c)
+zephyr_library_sources(atecc_basic.c)
+zephyr_library_sources(atecc_execution.c)
+zephyr_library_sources(atecc_random.c)
+zephyr_library_sources(atecc_read.c)
+zephyr_library_sources(atecc_write.c)
+zephyr_library_sources(atecc_info.c)
+zephyr_library_sources(atecc_lock.c)

drivers/mfd/ateccx08/Kconfig

@@ -0,0 +1,43 @@
+# Microchip ATECCx08 MFD
+
+# Copyright (c) 2024 Vogl Electronic GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+config MFD_ATECCX08
+	bool
+	help
+	  Enable support for Microchip ATECCx08 I2C CRYPTOs.
+
+config MFD_ATECC608
+	bool "Microchip ATECC608 I2C CRYPTO support"
+	default y
+	depends on DT_HAS_MICROCHIP_ATECC608_ENABLED
+	select I2C
+	select MFD_ATECCX08
+	help
+	  Enable support for Microchip ATECC608 I2C CRYPTOs.
+
+config MFD_ATECC508
+	bool "Microchip ATECC508 I2C CRYPTO support"
+	default y
+	depends on DT_HAS_MICROCHIP_ATECC508_ENABLED
+	select I2C
+	select MFD_ATECCX08
+	help
+	  Enable support for Microchip ATECC508 I2C CRYPTOs.
+
+if MFD_ATECCX08
+
+config MFD_ATECCX08_INIT_PRIORITY
+	int "Microchip ATECCx08 Initialization priority"
+	default 55
+	help
+	  This option enables the Microchip ATECCx08 eeprom driver OTP.
+
+config MFD_ATECCX08_SUBDEVICE_INIT_PRIORITY
+	int "Microchip ATECCx08 subdevice Initialization priority"
+	default 56
+	help
+	  This option enables the Microchip ATECCx08 eeprom driver OTP.
+
+endif