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Commit 414587c7 authored by Raghavendra Rao Ananta's avatar Raghavendra Rao Ananta
Browse files

of: Make of_get_ddrtype module friendly 



The APIs fdt_path_offset() and fdt_getprop_w() are not exported.
As a result, drivers that are compiled as modules cannot directly
use them. Hence, switch to of_find_node_by_path() and
of_property_read_u32() to achive the same functionality while also
being module friendly.

Change-Id: I90b299c60b60a006d0932442549c5d5a20cf2ea0
Signed-off-by: default avatarRaghavendra Rao Ananta <rananta@codeaurora.org>
parent a75e17c3

include/linux/of.h

+24 −0
Original line number Diff line number Diff line
@@ -1278,6 +1278,30 @@ static inline int of_get_available_child_count(const struct device_node *np) 
	return num;

}



/**

 * of_fdt_get_ddrtype - Return the type of ddr (4/5) on the current device

 *

 * On match, returns a non-zero positive value which matches the ddr type.

 * Otherwise returns -ENOENT.

 */

static inline int of_fdt_get_ddrtype(void)

{

	int ret;

	u32 ddr_type;

	struct device_node *mem_node;



	mem_node = of_find_node_by_path("/memory");

	if (!mem_node)

		return -ENOENT;



	ret = of_property_read_u32(mem_node, "ddr_device_type", &ddr_type);

	of_node_put(mem_node);

	if (ret < 0)

		return -ENOENT;



	return ddr_type;

}



#if defined(CONFIG_OF) && !defined(MODULE)

#define _OF_DECLARE(table, name, compat, fn, fn_type)			\

	static const struct of_device_id __of_table_##name		\

include/linux/of_fdt.h

+0 −26
Original line number Diff line number Diff line
@@ -12,7 +12,6 @@ 
#include <linux/types.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/libfdt.h>



/* Definitions used by the flattened device tree */

#define OF_DT_HEADER		0xd00dfeed	/* marker */
@@ -40,31 +39,6 @@ extern char __dtb_end[]; 
extern u64 of_flat_dt_translate_address(unsigned long node);

extern void of_fdt_limit_memory(int limit);



/**

 * of_fdt_get_ddrtype - Return the type of ddr (4/5) on the current device

 *

 * On match, returns a non-zero positive value which matches the ddr type.

 * Otherwise returns -ENOENT.

 */

static inline int of_fdt_get_ddrtype(void)

{

	int memory;

	int len;

	int ret;

	fdt32_t *prop = NULL;



	memory = fdt_path_offset(initial_boot_params, "/memory");

	if (memory > 0)

		prop = fdt_getprop_w(initial_boot_params, memory,

				  "ddr_device_type", &len);



	if (!prop || len != sizeof(u32))

		return -ENOENT;



	ret = fdt32_to_cpu(*prop);



	return ret;

}

#endif /* CONFIG_OF_FLATTREE */



#ifdef CONFIG_OF_EARLY_FLATTREE