On Thursday, March 23, 2017 3:43:28 PM CET Alban wrote:

On Tue, 14 Mar 2017 00:53:55 +0100
Christian Lamparter [off-list ref] wrote:

quoted

On Monday, March 13, 2017 10:05:11 PM CET Alban wrote:

quoted

Currently SoC platforms use a firmware request to get the EEPROM data.
This is mostly a hack and rely on using a user-helper scripts which is
deprecated. A nicer alternative is to use the nvmem API which was
designed for this kind of task.

Furthermore we let CONFIG_ATH9K_AHB select CONFIG_NVMEM as such
devices will generally use this method for loading the EEPROM data.

Signed-off-by: Alban <redacted>
---

@@ -654,6 +656,25 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
 	if (ret)
 		return ret;
 
+	/* If the EEPROM hasn't been retrieved via firmware request
+	 * use the nvmem API insted.
+	 */
+	if (!ah->eeprom_blob) {
+		struct nvmem_cell *eeprom_cell;
+
+		eeprom_cell = nvmem_cell_get(ah->dev, "eeprom");
+		if (!IS_ERR(eeprom_cell)) {
+			ah->eeprom_data = nvmem_cell_read(
+				eeprom_cell, &ah->eeprom_size);
+			nvmem_cell_put(eeprom_cell);
+
+			if (IS_ERR(ah->eeprom_data)) {
+				dev_err(ah->dev, "failed to read eeprom");
+				return PTR_ERR(ah->eeprom_data);
+			}
+		}
+	}
+
 	if (ath9k_led_active_high != -1)
 		ah->config.led_active_high = ath9k_led_active_high == 1;
   

Are you sure this works with AR93XX SoCs that have the calibration data
in the OTP?

I only tested this on an ar9132 platform, so it might well be that a
few things are missing for the newer SoC. However this shouldn't break
anything existing as a platform needs to define an nvmem cell on the
athk9 device for this code to be used a all.

Yes, I looked at it.
+		eeprom_cell = nvmem_cell_get(ah->dev, "eeprom");
+		if (!IS_ERR(eeprom_cell)) {
+			...
+		}
So if there's a error with the "eeprom" nvmem property,
(i.e.: it's not present) the driver should works as before.

Thanks,
Christian