mac80211: rt2x00: load the eeprom data from devicetree embedded data on Ralink SoCs

It will allow loading eeprom from eeprom-data embedded in device tree.
Ported from mediatek mt76 wireless driver (drivers/net/wireless/mediatek/mt76/eeprom.c)

Signed-off-by: Coia Prant <coiaprant@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17472
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/package/kernel/mac80211/patches/rt2x00/603-wifi-rt2x00-Add-support-for-loading-EEPROM-from-devicetree-embedded-data.patch b/package/kernel/mac80211/patches/rt2x00/603-wifi-rt2x00-Add-support-for-loading-EEPROM-from-devicetree-embedded-data.patch
new file mode 100644 (file)
index 0000000..0ef946a
--- /dev/null
+++ b/package/kernel/mac80211/patches/rt2x00/603-wifi-rt2x00-Add-support-for-loading-EEPROM-from-devicetree-embedded-data.patch
@@ -0,0 +1,76 @@
+From adf957124a115bdf3e4728e1ea8c70a632648cf0 Mon Sep 17 00:00:00 2001
+From: Coia Prant <coiaprant@gmail.com>
+Date: Fri, 14 Feb 2025 15:49:55 +0800
+Subject: [PATCH] wifi: rt2x00: Add support for loading EEPROM from devicetree
+ embedded data
+
+This patch allows rt2x00 to load eeprom from devicetree embedded data.
+
+Example:
+
+/* load eeprom from embedded data 'eeprom-data' */
+&wmac {
+       ralink,eeprom-data = <0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff
+                             0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0xffffffff>;
+};
+
+Signed-off-by: Coia Prant <coiaprant@gmail.com>
+---
+ .../net/wireless/ralink/rt2x00/rt2x00eeprom.c | 25 +++++++++++++++++++
+ 1 file changed, 25 insertions(+)
+
+--- a/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
++++ b/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
+@@ -33,6 +33,27 @@ static void rt2800lib_eeprom_swap(struct
+               rt2x00dev->eeprom[i] = swab16(rt2x00dev->eeprom[i]);
+ }
+ 
++static int rt2800lib_read_eeprom_data(struct rt2x00_dev *rt2x00dev)
++{
++      struct device_node *np = rt2x00dev->dev->of_node;
++      unsigned int len = rt2x00dev->ops->eeprom_size;
++      const void *data;
++      int size;
++
++      data = of_get_property(np, "ralink,eeprom-data", &size);
++      if (!data)
++              return -ENOENT;
++
++      if (size != len) {
++              dev_err(rt2x00dev->dev, "invalid eeprom size, required: 0x%04x\n", len);
++              return -EINVAL;
++      }
++
++      memcpy(rt2x00dev->eeprom, data, size);
++
++      return 0;
++}
++
+ #if IS_ENABLED(CONFIG_MTD)
+ static int rt2800lib_read_eeprom_mtd(struct rt2x00_dev *rt2x00dev)
+ {
+@@ -193,6 +214,10 @@ int rt2x00lib_read_eeprom(struct rt2x00_
+ {
+       int ret;
+ 
++      ret = rt2800lib_read_eeprom_data(rt2x00dev);
++      if (!ret)
++              return 0;
++
+ #if IS_ENABLED(CONFIG_MTD)
+       ret = rt2800lib_read_eeprom_mtd(rt2x00dev);
+       if (!ret)