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eeprom: at24: Add support for address-width property

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[ Upstream commit a2b3bf4846e5eed62ea6abb096af2c950961033c ]

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

Signed-off-by: Alan Chiang <alanx.chiang@intel.com>
Signed-off-by: Andy Yeh <andy.yeh@intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alan Chiang 2018-07-25 11:20:22 +08:00 committed by Greg Kroah-Hartman
parent 50961e4888
commit f63387b9ae
1 changed files with 17 additions and 0 deletions
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17
drivers/misc/eeprom/at24.c
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@ -577,6 +577,23 @@ static void at24_get_pdata(struct device *dev, struct at24_platform_data *chip)
if (device_property_present(dev, "read-only"))
chip->flags |= AT24_FLAG_READONLY;
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, "pagesize", &val);
if (!err) {
chip->page_size = val;