target/linux/mvebu/patches-3.14/009-add_of_mtd_ecc_helpers.patch

   1 From 6d9434ebb76157071164b32ad03fbed165c74382 Mon Sep 17 00:00:00 2001
   2 From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
   3 Date: Mon, 24 Feb 2014 19:24:48 -0300
   4 Subject: of_mtd: Add helpers to get ECC strength and ECC step size
   5
   6 This commit adds simple helpers to obtain the devicetree properties
   7 that specify the ECC strength and ECC step size to use on a given
   8 NAND controller.
   9
  10 Acked-by: Boris BREZILLON <b.brezillon.dev@gmail.com>
  11 Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
  12 Signed-off-by: Brian Norris <computersforpeace@gmail.com>
  13
  14 --- a/drivers/of/of_mtd.c
  15 +++ b/drivers/of/of_mtd.c
  16 @@ -50,6 +50,40 @@ int of_get_nand_ecc_mode(struct device_n
  17  EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode);
  18
  19  /**
  20 + * of_get_nand_ecc_step_size - Get ECC step size associated to
  21 + * the required ECC strength (see below).
  22 + * @np:        Pointer to the given device_node
  23 + *
  24 + * return the ECC step size, or errno in error case.
  25 + */
  26 +int of_get_nand_ecc_step_size(struct device_node *np)
  27 +{
  28 +       int ret;
  29 +       u32 val;
  30 +
  31 +       ret = of_property_read_u32(np, "nand-ecc-step-size", &val);
  32 +       return ret ? ret : val;
  33 +}
  34 +EXPORT_SYMBOL_GPL(of_get_nand_ecc_step_size);
  35 +
  36 +/**
  37 + * of_get_nand_ecc_strength - Get required ECC strength over the
  38 + * correspnding step size as defined by 'nand-ecc-size'
  39 + * @np:        Pointer to the given device_node
  40 + *
  41 + * return the ECC strength, or errno in error case.
  42 + */
  43 +int of_get_nand_ecc_strength(struct device_node *np)
  44 +{
  45 +       int ret;
  46 +       u32 val;
  47 +
  48 +       ret = of_property_read_u32(np, "nand-ecc-strength", &val);
  49 +       return ret ? ret : val;
  50 +}
  51 +EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength);
  52 +
  53 +/**
  54   * of_get_nand_bus_width - Get nand bus witdh for given device_node
  55   * @np:        Pointer to the given device_node
  56   *
  57 --- a/include/linux/of_mtd.h
  58 +++ b/include/linux/of_mtd.h
  59 @@ -13,6 +13,8 @@
  60
  61  #include <linux/of.h>
  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_bus_width(struct device_node *np);
  66  bool of_get_nand_on_flash_bbt(struct device_node *np);
  67
  68 @@ -23,6 +25,16 @@ static inline int of_get_nand_ecc_mode(s
  69         return -ENOSYS;
  70  }
  71
  72 +static inline int of_get_nand_ecc_step_size(struct device_node *np)
  73 +{
  74 +       return -ENOSYS;
  75 +}
  76 +
  77 +static inline int of_get_nand_ecc_strength(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;