1 /**
2  * @file
3  * @brief Flash Devicetree macro public API header file.
4  */
5 
6 /*
7  * Copyright (c) 2020, Linaro Ltd.
8  *
9  * SPDX-License-Identifier: Apache-2.0
10  */
11 
12 #ifndef ZEPHYR_INCLUDE_DEVICETREE_FIXED_PARTITION_H_
13 #define ZEPHYR_INCLUDE_DEVICETREE_FIXED_PARTITION_H_
14 
15 #ifdef __cplusplus
16 extern "C" {
17 #endif
18 
19 /**
20  * @defgroup devicetree-fixed-partition Devicetree Fixed Partition API
21  * @ingroup devicetree
22  * @{
23  */
24 
25 /**
26  * @brief Get a node identifier for a fixed partition with
27  *        a given label property
28  *
29  * Example devicetree fragment:
30  *
31  *     flash@... {
32  *              partitions {
33  *                      compatible = "fixed-partitions";
34  *                      boot_partition: partition@0 {
35  *                              label = "mcuboot";
36  *                      };
37  *                      slot0_partition: partition@c000 {
38  *                              label = "image-0";
39  *                      };
40  *                      ...
41  *              };
42  *     };
43  *
44  * Example usage:
45  *
46  *     DT_NODE_BY_FIXED_PARTITION_LABEL(mcuboot) // node identifier for boot_partition
47  *     DT_NODE_BY_FIXED_PARTITION_LABEL(image_0) // node identifier for slot0_partition
48  *
49  * @param label lowercase-and-underscores label property value
50  * @return a node identifier for the partition with that label property
51  */
52 #define DT_NODE_BY_FIXED_PARTITION_LABEL(label) \
53 	DT_CAT(DT_COMPAT_fixed_partitions_LABEL_, label)
54 
55 /**
56  * @brief Test if a fixed partition with a given label property exists
57  * @param label lowercase-and-underscores label property value
58  * @return 1 if any "fixed-partitions" child node has the given label,
59  *         0 otherwise.
60  */
61 #define DT_HAS_FIXED_PARTITION_LABEL(label) \
62 	IS_ENABLED(DT_COMPAT_fixed_partitions_LABEL_##label##_EXISTS)
63 
64 /**
65  * @brief Get a numeric identifier for a fixed partition
66  * @param node_id node identifier for a fixed-partitions child node
67  * @return the partition's ID, a unique zero-based index number
68  */
69 #define DT_FIXED_PARTITION_ID(node_id) DT_CAT(node_id, _PARTITION_ID)
70 
71 /**
72  * @brief Get the node identifier of the flash device for a partition
73  * @param node_id node identifier for a fixed-partitions child node
74  * @return the node identifier of the memory technology device that
75  * contains the fixed-partitions node.
76  */
77 #define DT_MTD_FROM_FIXED_PARTITION(node_id)				\
78 	COND_CODE_1(DT_NODE_HAS_COMPAT(DT_GPARENT(node_id), soc_nv_flash), \
79 		    (DT_PARENT(DT_GPARENT(node_id))),			\
80 		    (DT_GPARENT(node_id)))
81 
82 /**
83  * @}
84  */
85 
86 #ifdef __cplusplus
87 }
88 #endif
89 
90 #endif  /* ZEPHYR_INCLUDE_DEVICETREE_FIXED_PARTITION_H_ */
91