On 05/05/2020 22.13, Alexandre Belloni wrote:
> Add support for the RTC_VL_BACKUP_SWITCH flag to report battery switch over
> events.
>
> Signed-off-by: Alexandre Belloni <alexandre.bell...@bootlin.com>
> ---
> drivers/rtc/rtc-pcf2127.c | 16 ++++++++++++----
> 1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
> index 039078029bd4..967de68e1b03 100644
> --- a/drivers/rtc/rtc-pcf2127.c
> +++ b/drivers/rtc/rtc-pcf2127.c
> @@ -188,18 +188,27 @@ static int pcf2127_rtc_ioctl(struct device *dev,
> unsigned int cmd, unsigned long arg)
> {
> struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
> - int touser;
> + int val, touser = 0;
> int ret;
>
> switch (cmd) {
> case RTC_VL_READ:
> - ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL3, &touser);
> + ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL3, &val);
> if (ret)
> return ret;
>
> - touser = touser & PCF2127_BIT_CTRL3_BLF ? RTC_VL_BACKUP_LOW : 0;
> + if (val & PCF2127_BIT_CTRL3_BLF)
> + touser = RTC_VL_BACKUP_LOW;
> +
> + if (val & PCF2127_BIT_CTRL3_BF)
> + touser |= RTC_VL_BACKUP_SWITCH;
I think it's a bit easier to read if you use |= in both cases.
Re patch 3, one saves a little .text by eliding the ioctl function when,
as you say, it cannot be called anyway. No strong opinion either way, I
don't think anybody actually builds without CONFIG_RTC_INTF_DEV, but
those that do are probably the ones that care about having a tiny vmlinux.
Other than that, the series looks good to me.
Thanks,
Rasmus
