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drivers: of: Add API to find ddr device type

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

Change-Id: I1cfc38d46f1ea0abc6fbe8cbb6e37cde72b9fc2e
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>
[eberman@codeaurora.org: Move func to header]
Signed-off-by: Elliot Berman <eberman@codeaurora.org>
This commit is contained in:
Channagoud Kadabi 2018-11-05 16:22:29 -08:00 • committed by Elliot Berman
commit 651f44674f
1 changed files with 27 additions and 0 deletions
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27
include/linux/of_fdt.h
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@ -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