linux-kernel - Re: [PATCH v4 5/7] rtc: New driver for RTC in Netronix embedded controller

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Date:   Mon, 23 Nov 2020 22:38:08 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     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>,
        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, linux-pwm@...r.kernel.org,
        linux-rtc@...r.kernel.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>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v4 5/7] rtc: New driver for RTC in Netronix embedded
 controller

On 23/11/2020 22:31:05+0100, Jonathan Neuschäfer wrote:
> > > +	res = regmap_write(rtc->ec->regmap, NTXEC_REG_WRITE_MINUTE, ntxec_reg8(tm->tm_min));
> > > +	if (res)
> > > +		return res;
> > > +
> > > +	return regmap_write(rtc->ec->regmap, NTXEC_REG_WRITE_SECOND, ntxec_reg8(tm->tm_sec));
> > 
> > Couldn't you do a regmap_block_write or a regmap_multi_reg_write which
> > would be more efficient as they would be locking the regmap only once.
> 
> I can't find regmap_block_write anywhere, but regmap_multi_reg_write
> looks like a good approach to simplify the code here.
> 

I was thinking regmap_bulk_write but regmap_multi_reg_write is probably
more fitting here.

> 
> [...]
> > Note that this won't compile after
> > https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git/commit/?id=fdcfd854333be5b30377dc5daa9cd0fa1643a979
> > 
> > We can solve that with immutable branches though.
> 
> Thanks for the heads-up. Please let me know if/when there is any action
> that I need to take here.
> 

I wouldn't think so, I can carry a patch once Lee provides his usual
immutable branch.



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