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Commit 1b3ebeb6 authored by qctecmdr Service's avatar qctecmdr Service Committed by Gerrit - the friendly Code Review server
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Merge "drivers: of: Add API to find ddr device type"

parents d209fb08 d896f580

drivers/of/fdt.c

+26 −0
Original line number Diff line number Diff line
@@ -81,6 +81,32 @@ 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

+3 −0
Original line number Diff line number Diff line
@@ -47,6 +47,9 @@ extern void *initial_boot_params; 
extern char __dtb_start[];

extern char __dtb_end[];



/* Other Prototypes */

extern int of_fdt_get_ddrtype(void);



/* For scanning the flat device-tree at boot time */

extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,

				     int depth, void *data),