feat(storage/blockdev): Add generic partition blockdev driver

components/esp_blockdev_util/include/esp_blockdev/generic_partition.h

@@ -0,0 +1,55 @@
+/*
+ * SPDX-FileCopyrightText: 2025-2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <sys/types.h>
+#include <stddef.h>
+
+#include "esp_blockdev.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Create a new partition over a given blockdev
+ *
+ * @param parent The underlying device
+ * @param start Address of the start of the new partition. (Behaviour is undefined when this is not a multiple of block size for underlying device)
+ * @param size Size of the new partition. (Behaviour is undefined when this is not a multiple of block size for underlying device)
+ * @param out Where to store handle to the newly created block device. Will be unchanged upon failure.
+ *
+ * @return ESP_ERR_INVALID_ARG - Invalid argument was passed
+ *         ESP_ERR_NO_MEM - Failed to allocate the struct
+ *         ESP_OK
+ */
+esp_err_t esp_blockdev_generic_partition_get(esp_blockdev_handle_t parent, size_t start, size_t size, esp_blockdev_handle_t *out);
+
+/**
+ * @brief Translate virtual partition address to parents address space
+ *
+ * @param device The device for which to do the translation
+ * @param address Address to be translated, relative to the partition start
+ *
+ * @return Parent-space address on success
+ *         -1 on error (invalid argument or overflow)
+ */
+ssize_t esp_blockdev_generic_partition_translate_address_to_parent(esp_blockdev_handle_t device, size_t address);
+
+/**
+ * @brief Translate virtual partition address from parents address space
+ *
+ * @param device The device for which to do the translation
+ * @param address Address to be translated, in the parent address space
+ *
+ * @return Partition-relative address on success
+ *         -1 on error (invalid argument or underflow)
+ */
+ssize_t esp_blockdev_generic_partition_translate_address_to_child(esp_blockdev_handle_t device, size_t address);
+
+#ifdef __cplusplus
+}
+#endif