linux-kernel - Re: [PATCH] rtc: pcf2127: add error checking and message when disabling POR0

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Message-Id: <20230515141838.c18b0b9375606642ef979403@hugovil.com>
Date:   Mon, 15 May 2023 14:18:38 -0400
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
        hugo@...ovil.com
Subject: Re: [PATCH] rtc: pcf2127: add error checking and message when
 disabling POR0

On Tue, 15 Feb 2022 23:27:46 +0100
Alexandre Belloni <alexandre.belloni@...tlin.com> wrote:

> Hello,
> 
> On 17/01/2022 17:56:24-0500, Hugo Villeneuve wrote:
> > From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > 
> > If PCF2127 device is absent from the I2C bus, or if there is a
> > communication problem, disabling POR0 may fail silently and we
> > still continue with probing the device. In that case, abort probe
> > operation and display an error message.
> > 
> > Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > ---
> >  drivers/rtc/rtc-pcf2127.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
> > index 81a5b1f2e68c..e6d0838ccfe3 100644
> > --- a/drivers/rtc/rtc-pcf2127.c
> > +++ b/drivers/rtc/rtc-pcf2127.c
> > @@ -690,8 +690,12 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
> >  	 * The "Power-On Reset Override" facility prevents the RTC to do a reset
> >  	 * after power on. For normal operation the PORO must be disabled.
> >  	 */
> > -	regmap_clear_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
> > +	ret = regmap_clear_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
> >  				PCF2127_BIT_CTRL1_POR_OVRD);
> > +	if (ret < 0) {
> > +		dev_err(dev, "PORO disabling failed\n");
> 
> As discussed on the other patches, please do not add a message here.

I forgot to resend that patch without the message. I will do it soon.

Hugo.


> > +		return ret;
> > +	}
> >  
> >  	ret = regmap_read(pcf2127->regmap, PCF2127_REG_CLKOUT, &val);
> >  	if (ret < 0)
> > -- 
> > 2.30.2
> > 
> 
> -- 
> Alexandre Belloni, co-owner and COO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com


-- 
Hugo Villeneuve <hugo@...ovil.com>