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Commit 0288ffcb authored by Rob Herring's avatar Rob Herring
Browse files

of: Introduce common early_init_dt_scan 



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: default avatarRob Herring <rob.herring@calxeda.com>
Acked-by: default avatarGrant Likely <grant.likely@linaro.org>
parent 08854f41

drivers/of/fdt.c

+26 −0
Original line number Diff line number Diff line
@@ -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

 *

include/linux/of_fdt.h

+2 −0
Original line number Diff line number Diff line
@@ -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);