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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);
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