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- From 6b54054c4053215fe4add195c67daca9a466ba92 Mon Sep 17 00:00:00 2001
- From: "ying.zhang" <ying.zhang22455@nxp.com>
- Date: Fri, 23 Dec 2016 22:21:22 +0800
- Subject: [PATCH] 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>
- ---
- drivers/mtd/maps/physmap_of.c | 46 ++++++++++++++++++++++++++++++++++++++++-
- 1 file changed, 45 insertions(+), 1 deletion(-)
- --- a/drivers/mtd/maps/physmap_of.c
- +++ b/drivers/mtd/maps/physmap_of.c
- @@ -112,9 +112,47 @@ static struct mtd_info *obsolete_probe(s
- static const char * const part_probe_types_def[] = {
- "cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL };
-
- +static const char * const *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);
- + if (!res)
- + return NULL;
- + count = 0;
- + while (cplen > 0) {
- + res[count] = cp;
- + l = strlen(cp) + 1;
- + cp += l;
- + cplen -= l;
- + count++;
- + }
- + return res;
- +}
- +
- +static void of_free_probes(const char * const *probes)
- +{
- + if (probes != part_probe_types_def)
- + kfree(probes);
- +}
- +
- static const struct of_device_id of_flash_match[];
- static int of_flash_probe(struct platform_device *dev)
- {
- + const char * const *part_probe_types;
- const struct of_device_id *match;
- struct device_node *dp = dev->dev.of_node;
- struct resource res;
- @@ -273,8 +311,14 @@ static int of_flash_probe(struct platfor
- goto err_out;
-
- ppdata.of_node = dp;
- - mtd_device_parse_register(info->cmtd, part_probe_types_def, &ppdata,
- + part_probe_types = of_get_probes(dp);
- + if (!part_probe_types) {
- + err = -ENOMEM;
- + goto err_out;
- + }
- + mtd_device_parse_register(info->cmtd, part_probe_types, &ppdata,
- NULL, 0);
- + of_free_probes(part_probe_types);
-
- kfree(mtd_list);
-
|
