On Wed, Jun 27, 2018 at 01:46:25PM +0800, alanx.chiang@xxxxxxxxx wrote:
> From: Alan Chiang <alanx.chiang@xxxxxxxxx>
>
> 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@xxxxxxxxx>
> Signed-off-by: Andy Yeh <andy.yeh@xxxxxxxxx>
>
> ---
> 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");
Please don't wrap strings --- it breaks grep. Exceeding 80 is ok in this
case.
> + 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
>
--
Sakari Ailus
sakari.ailus@xxxxxxxxxxxxxxx
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