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Commit 651f4467 authored by Channagoud Kadabi's avatar Channagoud Kadabi Committed by Elliot Berman
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drivers: of: Add API to find ddr device type 



Add API to find the ddr device type from memory node.

Change-Id: I1cfc38d46f1ea0abc6fbe8cbb6e37cde72b9fc2e
Signed-off-by: default avatarChannagoud Kadabi <ckadabi@codeaurora.org>
[eberman@codeaurora.org: Move func to header]
Signed-off-by: default avatarElliot Berman <eberman@codeaurora.org>
parent df2f76f8

include/linux/of_fdt.h

+27 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#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 */
@@ -38,6 +39,32 @@ extern char __dtb_end[]; 
/* Other Prototypes */

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