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Commit ea47dd19 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

of/fdt: introduce of_scan_flat_dt_subnodes and of_get_flat_dt_phandle 



Introduce primitives for FDT parsing. These will be used for powerpc
cpufeatures node scanning, which has quite complex structure but should
be processed early.

Cc: devicetree@vger.kernel.org
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 0b382fb3

drivers/of/fdt.c

+38 −0
Original line number Diff line number Diff line
@@ -753,6 +753,36 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node, 
	return rc;

}



/**

 * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each.

 * @it: callback function

 * @data: context data pointer

 *

 * This function is used to scan sub-nodes of a node.

 */

int __init of_scan_flat_dt_subnodes(unsigned long parent,

				    int (*it)(unsigned long node,

					      const char *uname,

					      void *data),

				    void *data)

{

	const void *blob = initial_boot_params;

	int node;



	fdt_for_each_subnode(node, blob, parent) {

		const char *pathp;

		int rc;



		pathp = fdt_get_name(blob, node, NULL);

		if (*pathp == '/')

			pathp = kbasename(pathp);

		rc = it(node, pathp, data);

		if (rc)

			return rc;

	}

	return 0;

}



/**

 * of_get_flat_dt_subnode_by_name - get the subnode by given name

 *
@@ -812,6 +842,14 @@ int __init of_flat_dt_match(unsigned long node, const char *const *compat) 
	return of_fdt_match(initial_boot_params, node, compat);

}



/**

 * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle

 */

uint32_t __init of_get_flat_dt_phandle(unsigned long node)

{

	return fdt_get_phandle(initial_boot_params, node);

}



struct fdt_scan_status {

	const char *name;

	int namelen;

include/linux/of_fdt.h

+6 −0
Original line number Diff line number Diff line
@@ -54,6 +54,11 @@ extern char __dtb_end[]; 
extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,

				     int depth, void *data),

			   void *data);

extern int of_scan_flat_dt_subnodes(unsigned long node,

				    int (*it)(unsigned long node,

					      const char *uname,

					      void *data),

				    void *data);

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,
@@ -62,6 +67,7 @@ extern int of_flat_dt_is_compatible(unsigned long node, const char *name); 
extern int of_flat_dt_match(unsigned long node, const char *const *matches);

extern unsigned long of_get_flat_dt_root(void);

extern int of_get_flat_dt_size(void);

extern uint32_t of_get_flat_dt_phandle(unsigned long node);



extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,

				     int depth, void *data);