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Commit 368f22bc authored by Channagoud Kadabi's avatar Channagoud Kadabi Committed by Gerrit - the friendly Code Review server
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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>
parent 8960e2bd

drivers/of/fdt.c

+26 −0
Original line number Diff line number Diff line
@@ -79,6 +79,32 @@ 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.

 */

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;

}



/**

 * of_fdt_is_compatible - Return true if given node from the given blob has

 * compat in its compatible list

include/linux/of_fdt.h

+1 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ extern char __dtb_end[]; 
/* Other Prototypes */

extern u64 of_flat_dt_translate_address(unsigned long node);

extern void of_fdt_limit_memory(int limit);

extern int of_fdt_get_ddrtype(void);

#endif /* CONFIG_OF_FLATTREE */



#ifdef CONFIG_OF_EARLY_FLATTREE