From: Alan Chiang <[email protected]> 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 <[email protected]> Signed-off-by: Andy Yeh <[email protected]> --- since v1 -- Add a warn message for 8-bit addressing. since v2 -- Modify the warning message for clear. -- Move the clearing bit operation outside of a statement. --- drivers/misc/eeprom/at24.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 0c125f2..d606f3b 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -478,6 +478,24 @@ 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; -- 2.7.4
