target/linux/layerscape/patches-4.4/1239-mtd-extend-physmap_of-to-let-the-device-tree-specify.patch

   1 From 6b54054c4053215fe4add195c67daca9a466ba92 Mon Sep 17 00:00:00 2001
   2 From: "ying.zhang" <ying.zhang22455@nxp.com>
   3 Date: Fri, 23 Dec 2016 22:21:22 +0800
   4 Subject: [PATCH] mtd: extend physmap_of to let the device tree specify the
   5  parition probe
   6
   7 This is to support custom partitioning schemes for embedded PPC. To use
   8 define your own mtd_part_parser and then add something like:
   9         linux,part-probe = "my_probe", "cmdlinepart";
  10         To the board's dts file.
  11
  12 If linux,part-probe is not specified then this behaves the same as before.
  13
  14 Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
  15 Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
  16 ---
  17  drivers/mtd/maps/physmap_of.c |   46 ++++++++++++++++++++++++++++++++++++++++-
  18  1 file changed, 45 insertions(+), 1 deletion(-)
  19
  20 --- a/drivers/mtd/maps/physmap_of.c
  21 +++ b/drivers/mtd/maps/physmap_of.c
  22 @@ -112,9 +112,47 @@ static struct mtd_info *obsolete_probe(s
  23  static const char * const part_probe_types_def[] = {
  24         "cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL };
  25
  26 +static const char * const *of_get_probes(struct device_node *dp)
  27 +{
  28 +       const char *cp;
  29 +       int cplen;
  30 +       unsigned int l;
  31 +       unsigned int count;
  32 +       const char **res;
  33 +
  34 +       cp = of_get_property(dp, "linux,part-probe", &cplen);
  35 +       if (cp == NULL)
  36 +               return part_probe_types_def;
  37 +
  38 +       count = 0;
  39 +       for (l = 0; l != cplen; l++)
  40 +               if (cp[l] == 0)
  41 +                       count++;
  42 +
  43 +       res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL);
  44 +       if (!res)
  45 +               return NULL;
  46 +       count = 0;
  47 +       while (cplen > 0) {
  48 +               res[count] = cp;
  49 +               l = strlen(cp) + 1;
  50 +               cp += l;
  51 +               cplen -= l;
  52 +               count++;
  53 +       }
  54 +       return res;
  55 +}
  56 +
  57 +static void of_free_probes(const char * const *probes)
  58 +{
  59 +       if (probes != part_probe_types_def)
  60 +               kfree(probes);
  61 +}
  62 +
  63  static const struct of_device_id of_flash_match[];
  64  static int of_flash_probe(struct platform_device *dev)
  65  {
  66 +       const char * const *part_probe_types;
  67         const struct of_device_id *match;
  68         struct device_node *dp = dev->dev.of_node;
  69         struct resource res;
  70 @@ -273,8 +311,14 @@ static int of_flash_probe(struct platfor
  71                 goto err_out;
  72
  73         ppdata.of_node = dp;
  74 -       mtd_device_parse_register(info->cmtd, part_probe_types_def, &ppdata,
  75 +       part_probe_types = of_get_probes(dp);
  76 +       if (!part_probe_types) {
  77 +               err = -ENOMEM;
  78 +               goto err_out;
  79 +       }
  80 +       mtd_device_parse_register(info->cmtd, part_probe_types, &ppdata,
  81                         NULL, 0);
  82 +       of_free_probes(part_probe_types);
  83
  84         kfree(mtd_list);
  85