target/linux/generic/backport-5.10/409-v5.14-0002-mtd-parsers-trx-Allow-to-specify-brcm-trx-magic-in-D.patch

   1 From d7f7e04f8b67571a4bf5a0dcd4f9da4214f5262c Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sun, 18 Apr 2021 23:46:15 +0200
   4 Subject: mtd: parsers: trx: Allow to specify brcm, trx-magic in DT
   5
   6 Buffalo uses a different TRX magic for every device, to be able to use
   7 this trx parser, make it possible to specify the TRX magic in device
   8 tree. If no TRX magic is specified in device tree, the standard value
   9 will be used. This value should only be specified if a vendor chooses to
  10 use a non standard TRX magic.
  11
  12 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  13 Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
  14 Link: https://lore.kernel.org/linux-mtd/20210418214616.239574-3-hauke@hauke-m.de
  15 ---
  16  drivers/mtd/parsers/parser_trx.c | 9 ++++++++-
  17  1 file changed, 8 insertions(+), 1 deletion(-)
  18
  19 --- a/drivers/mtd/parsers/parser_trx.c
  20 +++ b/drivers/mtd/parsers/parser_trx.c
  21 @@ -51,13 +51,20 @@ static int parser_trx_parse(struct mtd_i
  22                             const struct mtd_partition **pparts,
  23                             struct mtd_part_parser_data *data)
  24  {
  25 +       struct device_node *np = mtd_get_of_node(mtd);
  26         struct mtd_partition *parts;
  27         struct mtd_partition *part;
  28         struct trx_header trx;
  29         size_t bytes_read;
  30         uint8_t curr_part = 0, i = 0;
  31 +       uint32_t trx_magic = TRX_MAGIC;
  32         int err;
  33
  34 +       /* Get different magic from device tree if specified */
  35 +       err = of_property_read_u32(np, "brcm,trx-magic", &trx_magic);
  36 +       if (err != 0 && err != -EINVAL)
  37 +               pr_err("failed to parse \"brcm,trx-magic\" DT attribute, using default: %d\n", err);
  38 +
  39         parts = kcalloc(TRX_PARSER_MAX_PARTS, sizeof(struct mtd_partition),
  40                         GFP_KERNEL);
  41         if (!parts)
  42 @@ -70,7 +77,7 @@ static int parser_trx_parse(struct mtd_i
  43                 return err;
  44         }
  45
  46 -       if (trx.magic != TRX_MAGIC) {
  47 +       if (trx.magic != trx_magic) {
  48                 kfree(parts);
  49                 return -ENOENT;
  50         }