diff options
| author | Alan Chiang <alanx.chiang@intel.com> | 2018-07-25 11:20:22 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-10 07:48:33 -0800 |
| commit | f63387b9ae1ddf1e121b220ebe917aeed7941054 (patch) | |
| tree | 8e24a9fecefae8d1e151da50a27414518962c29a /drivers/misc | |
| parent | 50961e4888a1d53544ac4ea6f185fc27ee4fee4f (diff) | |
eeprom: at24: Add support for address-width property
[ 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>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/eeprom/at24.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 4cc0b42f2acc..ded48a0c77ee 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -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; |