linux-kernel - Re: [PATCH v2 08/10] rtc: New driver for RTC in Netronix embedded controller

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Message-ID: <20200910194220.GE3306@latitude>
Date:   Thu, 10 Sep 2020 21:42:20 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Lubomir Rintel <lkundrak@...sk>,
        Mark Brown <broonie@...nel.org>, allen <allen.chen@....com.tw>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Josua Mayer <josua.mayer@....eu>,
        Andreas Kemnade <andreas@...nade.info>,
        Arnd Bergmann <arnd@...db.de>, Daniel Palmer <daniel@...f.com>
Subject: Re: [PATCH v2 08/10] rtc: New driver for RTC in Netronix embedded
 controller

On Sat, Sep 05, 2020 at 08:56:35PM +0300, Andy Shevchenko wrote:
> On Saturday, September 5, 2020, Jonathan Neuschäfer <j.neuschaefer@....net>
> wrote:
[...]
> > +#include <linux/of_device.h>
> 
> 
> No user for this. Perhaps you meant mod_devicetable.h?

Yes

> > +/* Convert an 8-bit value into the correct format for writing into a
> > register */
> > +#define u8_to_reg(x) (((x) & 0xff) << 8)
> 
> 
> This needs more explanation. Does register be16?

Yes, the registers are treated as be16 in the base driver. I wrote a
slightly longer explanation in response to your other review.

> > +static int ntxec_set_time(struct device *dev, struct rtc_time *tm)
> > +{
> > +       struct ntxec_rtc *rtc = dev_get_drvdata(dev);
> > +       int res = 0;
> > +
> > +       res |= regmap_write(rtc->ec->regmap, NTXEC_REG_WRITE_YEAR,
> > u8_to_reg(tm->tm_year - 100));
> > +       res |= regmap_write(rtc->ec->regmap, NTXEC_REG_WRITE_MONTH,
> > u8_to_reg(tm->tm_mon + 1));
> > +       res |= regmap_write(rtc->ec->regmap, NTXEC_REG_WRITE_DAY,
> > u8_to_reg(tm->tm_mday));
> > +       res |= regmap_write(rtc->ec->regmap, NTXEC_REG_WRITE_HOUR,
> > u8_to_reg(tm->tm_hour));
> > +       res |= regmap_write(rtc->ec->regmap, NTXEC_REG_WRITE_MINUTE,
> > u8_to_reg(tm->tm_min));
> > +       res |= regmap_write(rtc->ec->regmap, NTXEC_REG_WRITE_SECOND,
> > u8_to_reg(tm->tm_sec));
> > +
> > +       return (res < 0) ? -EIO : 0;
> 
> 
> Hmm... (I stumbled over res |= parts)

I'll convert it to the (more verbose but also more correct) pattern of
returning each error early.

> > +static const struct of_device_id ntxec_rtc_of_match[] = {
> > +       { .compatible = "netronix,ntxec-rtc" },
> > +       { },
> 
> 
> No need for comma in terminator line.

Okay


Thanks,
Jonathan Neuschäfer

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