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 --- a/drivers/of/of_mtd.c
  16 +++ b/drivers/of/of_mtd.c
  17 @@ -84,6 +84,41 @@ int of_get_nand_ecc_strength(struct devi
  18  EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength);
  19
  20  /**
  21 + * It maps 'enum nand_rnd_modes_t' found in include/linux/mtd/nand.h
  22 + * into the device tree binding of 'nand-rnd', so that MTD
  23 + * device driver can get nand rnd from device tree.
  24 + */
  25 +static const char *nand_rnd_modes[] = {
  26 +       [NAND_RND_NONE]         = "none",
  27 +       [NAND_RND_SOFT]         = "soft",
  28 +       [NAND_RND_HW]           = "hw",
  29 +};
  30 +
  31 +/**
  32 + * of_get_nand_rnd_mode - Get nand randomizer mode for given device_node
  33 + * @np:        Pointer to the given device_node
  34 + *
  35 + * The function gets randomizer mode string from property 'nand-rnd-mode',
  36 + * and return its index in nand_rnd_modes table, or errno in error case.
  37 + */
  38 +int of_get_nand_rnd_mode(struct device_node *np)
  39 +{
  40 +       const char *pm;
  41 +       int err, i;
  42 +
  43 +       err = of_property_read_string(np, "nand-rnd-mode", &pm);
  44 +       if (err < 0)
  45 +               return err;
  46 +
  47 +       for (i = 0; i < ARRAY_SIZE(nand_rnd_modes); i++)
  48 +               if (!strcasecmp(pm, nand_rnd_modes[i]))
  49 +                       return i;
  50 +
  51 +       return -ENODEV;
  52 +}
  53 +EXPORT_SYMBOL_GPL(of_get_nand_rnd_mode);
  54 +
  55 +/**
  56   * of_get_nand_bus_width - Get nand bus witdh for given device_node
  57   * @np:        Pointer to the given device_node
  58   *
  59 --- a/include/linux/of_mtd.h
  60 +++ b/include/linux/of_mtd.h
  61 @@ -15,6 +15,7 @@
  62  int of_get_nand_ecc_mode(struct device_node *np);
  63  int of_get_nand_ecc_step_size(struct device_node *np);
  64  int of_get_nand_ecc_strength(struct device_node *np);
  65 +int of_get_nand_rnd_mode(struct device_node *np);
  66  int of_get_nand_bus_width(struct device_node *np);
  67  bool of_get_nand_on_flash_bbt(struct device_node *np);
  68
  69 @@ -34,6 +35,11 @@ static inline int of_get_nand_ecc_streng
  70  {
  71         return -ENOSYS;
  72  }
  73 +
  74 +static inline int of_get_nand_rnd_mode(struct device_node *np)
  75 +{
  76 +       return -ENOSYS;
  77 +}
  78
  79  static inline int of_get_nand_bus_width(struct device_node *np)
  80  {