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mt76: support reading EEPROM data embedded in fdt

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Some platforms boot from SD card and don't come with calibration data
stored anywhere on the board.
As EEPROM data is rather small it can be embedded into the device tree
to be loaded from there by the mt76.

Signed-off-by: Daniel Golle <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Daniel Golle
2021-10-11 09:27:12 +02:00
committed by Felix Fietkau
parent 69bb59df89
commit 03a9926453
1 changed files with 11 additions and 0 deletions
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eeprom.c
+11
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@@ -15,6 +15,7 @@ int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
struct device_node *np = dev->dev->of_node;
struct mtd_info *mtd;
const __be32 *list;
const void *data;
const char *part;
phandle phandle;
int size;
@@ -24,6 +25,16 @@ int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
if (!np)
return -ENOENT;
data = of_get_property(np, "mediatek,eeprom-data", &size);
if (data) {
if (size > len)
return -EINVAL;
memcpy(eep, data, size);
return 0;
}
list = of_get_property(np, "mediatek,mtd-eeprom", &size);
if (!list)
return -ENOENT;