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Commit a2b3bf48 authored by Alan Chiang's avatar Alan Chiang Committed by Bartosz Golaszewski
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eeprom: at24: Add support for address-width property 



Provide a flexible way to determine the addressing bits of eeprom.
Pass the addressing bits to driver through address-width property.

Signed-off-by: default avatarAlan Chiang <alanx.chiang@intel.com>
Signed-off-by: default avatarAndy Yeh <andy.yeh@intel.com>
Signed-off-by: default avatarBartosz Golaszewski <brgl@bgdev.pl>
parent 21d04054

drivers/misc/eeprom/at24.c

+17 −0
Original line number Diff line number Diff line
@@ -478,6 +478,23 @@ static void at24_properties_to_pdata(struct device *dev, 
	if (device_property_present(dev, "no-read-rollover"))

		chip->flags |= AT24_FLAG_NO_RDROL;



	err = device_property_read_u32(dev, "address-width", &val);

	if (!err) {

		switch (val) {

		case 8:

			if (chip->flags & AT24_FLAG_ADDR16)

				dev_warn(dev, "Override address width to be 8, while default is 16\n");

			chip->flags &= ~AT24_FLAG_ADDR16;

			break;

		case 16:

			chip->flags |= AT24_FLAG_ADDR16;

			break;

		default:

			dev_warn(dev, "Bad \"address-width\" property: %u\n",

				 val);

		}

	}



	err = device_property_read_u32(dev, "size", &val);

	if (!err)

		chip->byte_len = val;