linux-kernel - RE: [Patch v3 3/7] rtc: DA9055 RTC driver

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Date:	Fri, 23 Nov 2012 17:57:37 +0530
From:	Ashish Jangam <ashish.jangam@...tcummins.com>
To:	Venu Byravarasu <vbyravarasu@...dia.com>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"p_gortmaker@...oo.com" <p_gortmaker@...oo.com>,
	"dchen@...semi.com" <dchen@...semi.com>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	Alessandro Zummo <a.zummo@...ertech.it>
Subject: RE: [Patch v3 3/7] rtc: DA9055 RTC driver

On Fri, 2012-11-23 at 16:39 +0530, Venu Byravarasu wrote:
> > -----Original Message-----
> > From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> > owner@...r.kernel.org] On Behalf Of Ashish Jangam
> > Sent: Friday, November 23, 2012 3:41 PM
> > To: akpm@...ux-foundation.org
> > Cc: linux-kernel@...r.kernel.org; sameo@...ux.intel.com;
> > p_gortmaker@...oo.com; dchen@...semi.com; rtc-
> > linux@...glegroups.com; Alessandro Zummo
> > Subject: Re: [Patch v3 3/7] rtc: DA9055 RTC driver
> > 
> > Any comments on this patch.
> > On Tue, 2012-10-23 at 15:33 +0530, Ashish Jangam wrote:
> > > Does this patch looks good?
> > > On Thu, 2012-10-11 at 16:10 +0530, Ashish Jangam wrote:
> > > > This is the RTC patch for the DA9055 PMIC. This patch has got
> > dependency on
> > > > the DA9055 MFD core.
> > > >
> > > > This patch is functionally tested on Samsung SMDKV6410.
> > > >
> > > > Signed-off-by: David Dajun Chen <dchen@...semi.com>
> > > > Signed-off-by: Ashish Jangam <ashish.jangam@...tcummins.com>
> > > > ---
> > > > changes since version v3:
> > > > - use of module_platform_driver macro
> > > > - add the regmap virtual irq map API.
> > > > changes since version v2:
> > > > - Use of devm_request_threaded_irq API
> > > > ---
> > > >  drivers/rtc/Kconfig      |   10 +
> > > >  drivers/rtc/Makefile     |    1 +
> > > >  drivers/rtc/rtc-da9055.c |  413
> > ++++++++++++++++++++++++++++++++++++++++++++++
> > > >  3 files changed, 424 insertions(+), 0 deletions(-)
> > > >  mode change 100644 => 100755 drivers/rtc/Kconfig
> > > >  create mode 100644 drivers/rtc/rtc-da9055.c
> > > >
> 
> > > > +static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time
> > *rtc_tm)
> > > > +{
> > > > +	int ret;
> > > > +	uint8_t v[2];
> > > > +
> > > > +	rtc_tm->tm_year -= 100;
> > > > +	rtc_tm->tm_mon += 1;
> > > > +
> > > > +	ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
> > > > +				DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
> > > > +	if (ret != 0) {
> > > > +		dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n",
> > ret);
> > > > +		return ret;
> > > > +	}
> > > > +
> > > > +	v[0] = rtc_tm->tm_hour;
> > > > +	v[1] = rtc_tm->tm_mday;
> > > > +
> > > > +	ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
> 
> Why don't you write all registers at once using single multi byte
> write command as you already used in da9055_rtc_set_time() ?
Unlike TIME/Date registers some of the ALARM register bits has got few
other bits which should not get modified during the setting of ALARM
therefore reg_update was used for those ALARM register.   


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