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of/fdt: Consolidate duplicate code into helper functions

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Currently, there are many pieces of nearly identical code scattered across
different places. Consolidate the duplicate code into helper functions to
improve maintainability and reduce the likelihood of errors.

Signed-off-by: Yuntao Wang <yuntao.wang@linux.dev>
Link: https://patch.msgid.link/20251115134753.179931-2-yuntao.wang@linux.dev
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
This commit is contained in:
Yuntao Wang
2025-11-15 21:47:46 +08:00
committed by Rob Herring (Arm)
parent a5387fbc66
commit 8278cb72c6
2 changed files with 50 additions and 0 deletions
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41
drivers/of/fdt.c
View File

@@ -625,6 +625,47 @@ const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
return fdt_getprop(initial_boot_params, node, name, size);
}
const __be32 *__init of_flat_dt_get_addr_size_prop(unsigned long node,
const char *name,
int *entries)
{
const __be32 *prop;
int len, elen = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
prop = of_get_flat_dt_prop(node, name, &len);
if (!prop || len % elen) {
*entries = 0;
return NULL;
}
*entries = len / elen;
return prop;
}
bool __init of_flat_dt_get_addr_size(unsigned long node, const char *name,
u64 *addr, u64 *size)
{
const __be32 *prop;
int entries;
prop = of_flat_dt_get_addr_size_prop(node, name, &entries);
if (!prop || entries != 1)
return false;
of_flat_dt_read_addr_size(prop, 0, addr, size);
return true;
}
void __init of_flat_dt_read_addr_size(const __be32 *prop, int entry_index,
u64 *addr, u64 *size)
{
int entry_cells = dt_root_addr_cells + dt_root_size_cells;
prop += entry_cells * entry_index;
*addr = dt_mem_next_cell(dt_root_addr_cells, &prop);
*size = dt_mem_next_cell(dt_root_size_cells, &prop);
}
/**
* of_fdt_is_compatible - Return true if given node from the given blob has
* compat in its compatible list

9
include/linux/of_fdt.h
View File

@@ -55,6 +55,15 @@ extern int of_get_flat_dt_subnode_by_name(unsigned long node,
const char *uname);
extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
int *size);
extern const __be32 *of_flat_dt_get_addr_size_prop(unsigned long node,
const char *name,
int *entries);
extern bool of_flat_dt_get_addr_size(unsigned long node, const char *name,
u64 *addr, u64 *size);
extern void of_flat_dt_read_addr_size(const __be32 *prop, int entry_index,
u64 *addr, u64 *size);
extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
extern unsigned long of_get_flat_dt_root(void);
extern uint32_t of_get_flat_dt_phandle(unsigned long node);