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of: Introduce common early_init_dt_scan

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Most architectures scan the all the same items early in the FDT and none
are really architecture specific. Create a common early_init_dt_scan to
unify the early scan of root, memory, and chosen nodes in the flattened
DT.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Rob Herring 2013-08-26 09:47:40 -05:00
parent 08854f4180
commit 0288ffcbfd
2 changed files with 28 additions and 0 deletions
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26
drivers/of/fdt.c
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@ -785,6 +785,32 @@ void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
}
#endif
bool __init early_init_dt_scan(void *params)
{
if (!params)
return false;
/* Setup flat device-tree pointer */
initial_boot_params = params;
/* check device tree validity */
if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) {
initial_boot_params = NULL;
return false;
}
/* Retrieve various information from the /chosen node */
of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
/* Initialize {size,address}-cells info */
of_scan_flat_dt(early_init_dt_scan_root, NULL);
/* Setup memory, calling early_init_dt_add_memory_arch */
of_scan_flat_dt(early_init_dt_scan_memory, NULL);
return true;
}
/**
* unflatten_device_tree - create tree of device_nodes from flat blob
*

2
include/linux/of_fdt.h
View File

@ -116,6 +116,8 @@ extern void early_init_dt_setup_initrd_arch(u64 start, u64 end);
extern int early_init_dt_scan_root(unsigned long node, const char *uname,
int depth, void *data);
extern bool early_init_dt_scan(void *params);
/* Other Prototypes */
extern void unflatten_device_tree(void);
extern void unflatten_and_copy_device_tree(void);