linux-kernel - Re: [PATCH 1/3] rtc: ds1374: add uie_unsupported property to drop warning

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Date:   Fri, 8 May 2020 13:49:47 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Biwen Li <biwen.li@....nxp.com>
Cc:     leoyang.li@....com, robh+dt@...nel.org, mpe@...erman.id.au,
        benh@...nel.crashing.org, a.zummo@...ertech.it,
        devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org,
        Biwen Li <biwen.li@....com>
Subject: Re: [PATCH 1/3] rtc: ds1374: add uie_unsupported property to drop
 warning

Hi,

On 08/05/2020 13:49:23+0800, Biwen Li wrote:
> From: Biwen Li <biwen.li@....com>
> 
> Add uie_unsupported property to drop warning as follows:
>     - $ hwclock.util-linux
>       hwclock.util-liux: select() /dev/rtc0
>       to wait for clock tick timed out
> 
> My case:
>     - RTC ds1374's INT pin is connected to VCC on T4240RDB,
>       then the RTC cannot inform cpu about the alarm
>       interrupt
> 
> Signed-off-by: Biwen Li <biwen.li@....com>
> ---
>  drivers/rtc/rtc-ds1374.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
> index 9c51a12cf70f..e530e887a17e 100644
> --- a/drivers/rtc/rtc-ds1374.c
> +++ b/drivers/rtc/rtc-ds1374.c
> @@ -651,6 +651,10 @@ static int ds1374_probe(struct i2c_client *client,
>  	if (ret)
>  		return ret;
>  
> +	if (of_property_read_bool(client->dev.of_node,
> +						 "uie_unsupported"))
> +		ds1374->rtc->uie_unsupported = true;
> +

This is not how this is supposed to work, either the RTC support uie or
don't, it is not board dependent and certainly doesn't require an
(undocumented) DT property.

>  #ifdef CONFIG_RTC_DRV_DS1374_WDT
>  	save_client = client;
>  	ret = misc_register(&ds1374_miscdev);
> -- 
> 2.17.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com