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image: android-dt: add dt_for_each_entry() to iterate over all dt entry of DT image 

Change-Id: I4db1e1da0d55701798bb8c296dd58e26592ef3c8
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
This commit is contained in:
Joseph Chen 2018-08-01 15:43:32 +08:00 committed by Kever Yang
parent c673757f56
commit bcd21a1f01
2 changed files with 44 additions and 0 deletions
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17
common/image-android-dt.c
View File

@ -155,3 +155,20 @@ void android_dt_print_contents(ulong hdr_addr)
} }
} }
#endif #endif
/**
* Get dt entry count of DT image structure.
*
* @param hdr_addr Start address of DT image
*/
int android_dt_get_count(ulong hdr_addr)
{
const struct dt_table_header *hdr;
int count;
hdr = map_sysmem(hdr_addr, sizeof(*hdr));
count = fdt32_to_cpu(hdr->dt_entry_count);
unmap_sysmem(hdr);
return count;
}

27
include/image-android-dt.h
View File

@ -13,9 +13,36 @@
bool android_dt_check_header(ulong hdr_addr); bool android_dt_check_header(ulong hdr_addr);
bool android_dt_get_fdt_by_index(ulong hdr_addr, u32 index, ulong *addr, bool android_dt_get_fdt_by_index(ulong hdr_addr, u32 index, ulong *addr,
u32 *size); u32 *size);
int android_dt_get_count(ulong hdr_addr);
#if !defined(CONFIG_SPL_BUILD) #if !defined(CONFIG_SPL_BUILD)
void android_dt_print_contents(ulong hdr_addr); void android_dt_print_contents(ulong hdr_addr);
#endif #endif
/**
* dt_for_each_entry() - iterate over all dt entry of DT image
*
* @entry: struct dt_table_entry pointing to entry address
* @hdr: struct dt_table_header pointing to hdr address
* @idx: temporary index variant
*
* This is a wrapper around a for loop and is used like so:
*
* struct dt_table_header *hdr;
* struct dt_table_entry *entry;
* int index;
*
* ......
*
* dt_for_each_entry(entry, hdr, index) {
* Use entry
* ...
* }
*
*/
#define dt_for_each_entry(entry, hdr, idx) \
for (idx = 0, android_dt_get_fdt_by_index((ulong)hdr, idx, (ulong *)&entry, NULL); \
idx < android_dt_get_count((ulong)hdr); \
idx++, android_dt_get_fdt_by_index((ulong)hdr, idx, (ulong *)&entry, NULL))
#endif /* IMAGE_ANDROID_DT_H */ #endif /* IMAGE_ANDROID_DT_H */