On 11/11/2021 23:58:47+0100, Luca Ceresoli wrote:
> The MAX77714 RTC chip is explicitly set to 24-hour mode in
> max77686_rtc_probe() -> max77686_rtc_init_reg() and never changed back to
> 12-hour mode. Accordingly info->rtc_24hr_mode is set to 1 in the same place
> and never modified later, so it is de facto a constant. Yet there is code
> to read 12-hour time, which is unreachable.
>
> Remove the unused variable, the unreachable code to manage 12-hour mode and
> the defines that become unused due to the above changes.
>
> Signed-off-by: Luca Ceresoli <luca@xxxxxxxxxxxxxxxx>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
Acked-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
>
> ---
>
> Changes in v3: none
>
> Changes in v2:
> - remove the now-unused defines too (Alexandre Belloni)
> - improve the commit message
> ---
> drivers/rtc/rtc-max77686.c | 14 +-------------
> 1 file changed, 1 insertion(+), 13 deletions(-)
>
> diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
> index 7e765207f28e..5c64d08c0732 100644
> --- a/drivers/rtc/rtc-max77686.c
> +++ b/drivers/rtc/rtc-max77686.c
> @@ -34,9 +34,6 @@
> #define RTC_UDR_MASK BIT(RTC_UDR_SHIFT)
> #define RTC_RBUDR_SHIFT 4
> #define RTC_RBUDR_MASK BIT(RTC_RBUDR_SHIFT)
> -/* RTC Hour register */
> -#define HOUR_PM_SHIFT 6
> -#define HOUR_PM_MASK BIT(HOUR_PM_SHIFT)
> /* RTC Alarm Enable */
> #define ALARM_ENABLE_SHIFT 7
> #define ALARM_ENABLE_MASK BIT(ALARM_ENABLE_SHIFT)
> @@ -99,7 +96,6 @@ struct max77686_rtc_info {
>
> int rtc_irq;
> int virq;
> - int rtc_24hr_mode;
> };
>
> enum MAX77686_RTC_OP {
> @@ -278,13 +274,7 @@ static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
>
> tm->tm_sec = data[RTC_SEC] & mask;
> tm->tm_min = data[RTC_MIN] & mask;
> - if (info->rtc_24hr_mode) {
> - tm->tm_hour = data[RTC_HOUR] & 0x1f;
> - } else {
> - tm->tm_hour = data[RTC_HOUR] & 0x0f;
> - if (data[RTC_HOUR] & HOUR_PM_MASK)
> - tm->tm_hour += 12;
> - }
> + tm->tm_hour = data[RTC_HOUR] & 0x1f;
>
> /* Only a single bit is set in data[], so fls() would be equivalent */
> tm->tm_wday = ffs(data[RTC_WEEKDAY] & mask) - 1;
> @@ -662,8 +652,6 @@ static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
> data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
> data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
>
> - info->rtc_24hr_mode = 1;
> -
> ret = regmap_bulk_write(info->rtc_regmap,
> info->drv_data->map[REG_RTC_CONTROLM],
> data, ARRAY_SIZE(data));
> --
> 2.25.1
>
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
