On 15/11/2024 14:48:58-0500, Frank Li wrote:
> From: Jacky Bai <ping.bai@xxxxxxx>
>
> Enable the RTC by default even when no valid time is set to ensure the
> RTC's time read and alarm functions work properly. Without this, running
> hwclock results in the following error:
>
> hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: Invalid argument
>
What is providing your hwclock and which version does it have?
> Fixes: eb7b85853c38 ("rtc: bbnsm: Add the bbnsm rtc support")
> Signed-off-by: Jacky Bai <ping.bai@xxxxxxx>
> Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx>
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> drivers/rtc/rtc-nxp-bbnsm.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/rtc/rtc-nxp-bbnsm.c b/drivers/rtc/rtc-nxp-bbnsm.c
> index fa3b0328c7a25..6610db2f75125 100644
> --- a/drivers/rtc/rtc-nxp-bbnsm.c
> +++ b/drivers/rtc/rtc-nxp-bbnsm.c
> @@ -189,6 +189,9 @@ static int bbnsm_rtc_probe(struct platform_device *pdev)
> /* clear all the pending events */
> regmap_write(bbnsm->regmap, BBNSM_EVENTS, 0x7A);
>
> + /* Enable the Real-Time counter */
> + regmap_update_bits(bbnsm->regmap, BBNSM_CTRL, RTC_EN_MSK, RTC_EN);
> +
> device_init_wakeup(&pdev->dev, true);
> dev_pm_set_wake_irq(&pdev->dev, bbnsm->irq);
>
> --
> 2.34.1
>
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
