target/linux/sunxi/patches-4.1/115-mtd-fetch-randomizer-mode.patch

   1 From eb7f9115409710732ebc4dfe1be629252280910e Mon Sep 17 00:00:00 2001
   2 From: Boris BREZILLON <boris.brezillon@free-electrons.com>
   3 Date: Mon, 28 Jul 2014 14:47:04 +0200
   4 Subject: [PATCH] of: mtd: Add NAND randomizer mode retrieval
   5
   6 Add a of_get_nand_rnd_mode() helper function.
   7
   8 Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
   9 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  10 ---
  11  drivers/of/of_mtd.c    | 35 +++++++++++++++++++++++++++++++++++
  12  include/linux/of_mtd.h |  6 ++++++
  13  2 files changed, 41 insertions(+)
  14
  15 diff --git a/drivers/of/of_mtd.c b/drivers/of/of_mtd.c
  16 index b7361ed..4e42c26 100644
  17 --- a/drivers/of/of_mtd.c
  18 +++ b/drivers/of/of_mtd.c
  19 @@ -84,6 +84,41 @@ int of_get_nand_ecc_strength(struct device_node *np)
  20  EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength);
  21
  22  /**
  23 + * It maps 'enum nand_rnd_modes_t' found in include/linux/mtd/nand.h
  24 + * into the device tree binding of 'nand-rnd', so that MTD
  25 + * device driver can get nand rnd from device tree.
  26 + */
  27 +static const char *nand_rnd_modes[] = {
  28 +       [NAND_RND_NONE]         = "none",
  29 +       [NAND_RND_SOFT]         = "soft",
  30 +       [NAND_RND_HW]           = "hw",
  31 +};
  32 +
  33 +/**
  34 + * of_get_nand_rnd_mode - Get nand randomizer mode for given device_node
  35 + * @np:        Pointer to the given device_node
  36 + *
  37 + * The function gets randomizer mode string from property 'nand-rnd-mode',
  38 + * and return its index in nand_rnd_modes table, or errno in error case.
  39 + */
  40 +int of_get_nand_rnd_mode(struct device_node *np)
  41 +{
  42 +       const char *pm;
  43 +       int err, i;
  44 +
  45 +       err = of_property_read_string(np, "nand-rnd-mode", &pm);
  46 +       if (err < 0)
  47 +               return err;
  48 +
  49 +       for (i = 0; i < ARRAY_SIZE(nand_rnd_modes); i++)
  50 +               if (!strcasecmp(pm, nand_rnd_modes[i]))
  51 +                       return i;
  52 +
  53 +       return -ENODEV;
  54 +}
  55 +EXPORT_SYMBOL_GPL(of_get_nand_rnd_mode);
  56 +
  57 +/**
  58   * of_get_nand_bus_width - Get nand bus witdh for given device_node
  59   * @np:        Pointer to the given device_node
  60   *
  61 diff --git a/include/linux/of_mtd.h b/include/linux/of_mtd.h
  62 index e266caa..1059472 100644
  63 --- a/include/linux/of_mtd.h
  64 +++ b/include/linux/of_mtd.h
  65 @@ -15,6 +15,7 @@
  66  int of_get_nand_ecc_mode(struct device_node *np);
  67  int of_get_nand_ecc_step_size(struct device_node *np);
  68  int of_get_nand_ecc_strength(struct device_node *np);
  69 +int of_get_nand_rnd_mode(struct device_node *np);
  70  int of_get_nand_bus_width(struct device_node *np);
  71  bool of_get_nand_on_flash_bbt(struct device_node *np);
  72
  73 @@ -35,6 +36,11 @@ static inline int of_get_nand_ecc_strength(struct device_node *np)
  74         return -ENOSYS;
  75  }
  76
  77 +static inline int of_get_nand_rnd_mode(struct device_node *np)
  78 +{
  79 +       return -ENOSYS;
  80 +}
  81 +
  82  static inline int of_get_nand_bus_width(struct device_node *np)
  83  {
  84         return -ENOSYS;