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   1 From adf957124a115bdf3e4728e1ea8c70a632648cf0 Mon Sep 17 00:00:00 2001
   2 From: Coia Prant <coiaprant@gmail.com>
   3 Date: Fri, 14 Feb 2025 15:49:55 +0800
   4 Subject: [PATCH] wifi: rt2x00: Add support for loading EEPROM from devicetree
   5  embedded data
   6
   7 This patch allows rt2x00 to load eeprom from devicetree embedded data.
   8
   9 Example:
  10
  11 /* load eeprom from embedded data 'eeprom-data' */
  12 &wmac {
  13         ralink,eeprom-data = <0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  14                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  15                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  16                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  17                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  18                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  19                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  20                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  21                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  22                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  23                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  24                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  25                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  26                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  27                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
  28                               0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff>;
  29 };
  30
  31 Signed-off-by: Coia Prant <coiaprant@gmail.com>
  32 ---
  33  .../net/wireless/ralink/rt2x00/rt2x00eeprom.c | 25 +++++++++++++++++++
  34  1 file changed, 25 insertions(+)
  35
  36 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
  37 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
  38 @@ -33,6 +33,27 @@ static void rt2800lib_eeprom_swap(struct
  39                 rt2x00dev->eeprom[i] = swab16(rt2x00dev->eeprom[i]);
  40  }
  41
  42 +static int rt2800lib_read_eeprom_data(struct rt2x00_dev *rt2x00dev)
  43 +{
  44 +       struct device_node *np = rt2x00dev->dev->of_node;
  45 +       unsigned int len = rt2x00dev->ops->eeprom_size;
  46 +       const void *data;
  47 +       int size;
  48 +
  49 +       data = of_get_property(np, "ralink,eeprom-data", &size);
  50 +       if (!data)
  51 +               return -ENOENT;
  52 +
  53 +       if (size != len) {
  54 +               dev_err(rt2x00dev->dev, "invalid eeprom size, required: 0x%04x\n", len);
  55 +               return -EINVAL;
  56 +       }
  57 +
  58 +       memcpy(rt2x00dev->eeprom, data, size);
  59 +
  60 +       return 0;
  61 +}
  62 +
  63  #if IS_ENABLED(CONFIG_MTD)
  64  static int rt2800lib_read_eeprom_mtd(struct rt2x00_dev *rt2x00dev)
  65  {
  66 @@ -193,6 +214,10 @@ int rt2x00lib_read_eeprom(struct rt2x00_
  67  {
  68         int ret;
  69
  70 +       ret = rt2800lib_read_eeprom_data(rt2x00dev);
  71 +       if (!ret)
  72 +               return 0;
  73 +
  74  #if IS_ENABLED(CONFIG_MTD)
  75         ret = rt2800lib_read_eeprom_mtd(rt2x00dev);
  76         if (!ret)