linux-kernel - Re: [PATCH 1/1] rtc: bbnsm: Enable RTC by default to fix time read failure

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Message-ID: <20241116193652a13b3081@mail.local>
Date: Sat, 16 Nov 2024 20:36:52 +0100
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Frank Li <Frank.Li@....com>
Cc: Jacky Bai <ping.bai@....com>, Peng Fan <peng.fan@....com>,
	"open list:REAL TIME CLOCK (RTC) SUBSYSTEM" <linux-rtc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>, imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] rtc: bbnsm: Enable RTC by default to fix time read
 failure

On 15/11/2024 14:48:58-0500, Frank Li wrote:
> From: Jacky Bai <ping.bai@....com>
> 
> 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@....com>
> Signed-off-by: Dong Aisheng <aisheng.dong@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  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