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mtd: extend physmap_of to let the device tree specify the parition probe 

This is to support custom partitioning schemes for embedded PPC. To use
define your own mtd_part_parser and then add something like:
   linux,part-probe = "my_probe", "cmdlinepart";
To the board's dts file.

If linux,part-probe is not specified then this behaves the same as before.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Jason Gunthorpe 2010-03-09 12:27:56 -07:00 committed by David Woodhouse
parent 2bfefa4c96
commit 9d5da3a9b8
1 changed files with 48 additions and 5 deletions
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53
drivers/mtd/maps/physmap_of.c
View File

@ -173,12 +173,53 @@ static struct mtd_info * __devinit obsolete_probe(struct of_device *dev,
}
}
#ifdef CONFIG_MTD_PARTITIONS
/* When partitions are set we look for a linux,part-probe property which
specifies the list of partition probers to use. If none is given then the
default is use. These take precedence over other device tree
information. */
static const char *part_probe_types_def[] = { "cmdlinepart", "RedBoot", NULL };
static const char ** __devinit of_get_probes(struct device_node *dp)
{
const char *cp;
int cplen;
unsigned int l;
unsigned int count;
const char **res;
cp = of_get_property(dp, "linux,part-probe", &cplen);
if (cp == NULL)
return part_probe_types_def;
count = 0;
for (l = 0; l != cplen; l++)
if (cp[l] == 0)
count++;
res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL);
count = 0;
while (cplen > 0) {
res[count] = cp;
l = strlen(cp) + 1;
cp += l;
cplen -= l;
count++;
}
return res;
}
static void __devinit of_free_probes(const char **probes)
{
if (probes != part_probe_types_def)
kfree(probes);
}
#endif
static int __devinit of_flash_probe(struct of_device *dev,
const struct of_device_id *match)
{
#ifdef CONFIG_MTD_PARTITIONS
static const char *part_probe_types[]
= { "cmdlinepart", "RedBoot", NULL };
const char **part_probe_types;
#endif
struct device_node *dp = dev->node;
struct resource res;
@ -307,12 +348,14 @@ static int __devinit of_flash_probe(struct of_device *dev,
goto err_out;
#ifdef CONFIG_MTD_PARTITIONS
/* First look for RedBoot table or partitions on the command
* line, these take precedence over device tree information */
part_probe_types = of_get_probes(dp);
err = parse_mtd_partitions(info->cmtd, part_probe_types,
&info->parts, 0);
if (err < 0)
if (err < 0) {
of_free_probes(part_probe_types);
return err;
}
of_free_probes(part_probe_types);
#ifdef CONFIG_MTD_OF_PARTS
if (err == 0) {