linux-kernel - RE: [PATCH v2 2/3] rtc: s3c: support for exynosautov9 on-chip RTC

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Message-ID: <188001dbf249$831afd00$8950f700$@samsung.com>
Date: Fri, 11 Jul 2025 15:22:25 +0530
From: "Devang Tailor" <dev.tailor@...sung.com>
To: "'Krzysztof Kozlowski'" <krzk@...nel.org>
Cc: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<alim.akhtar@...sung.com>, <alexandre.belloni@...tlin.com>,
	<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-samsung-soc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-rtc@...r.kernel.org>, <faraz.ata@...sung.com>
Subject: RE: [PATCH v2 2/3] rtc: s3c: support for exynosautov9 on-chip RTC


Hi Krzysztof,


> -----Original Message-----
> From: Krzysztof Kozlowski <krzk@...nel.org>
> Sent: 11 July 2025 12:51
> To: Devang Tailor <dev.tailor@...sung.com>
> Cc: robh@...nel.org; krzk+dt@...nel.org; conor+dt@...nel.org;
> alim.akhtar@...sung.com; alexandre.belloni@...tlin.com;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> samsung-soc@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> rtc@...r.kernel.org; faraz.ata@...sung.com
> Subject: Re: [PATCH v2 2/3] rtc: s3c: support for exynosautov9 on-chip RTC
> 
> On Thu, Jul 10, 2025 at 02:04:33PM +0530, Devang Tailor wrote:
> > The on-chip RTC of this SoC is almost similar to the previous versions
> > of SoC. Hence re-use the existing driver with platform specific change
> > to enable RTC.
> >
> > This has been tested with 'hwclock' & 'date' utilities
> >
> > Signed-off-by: Devang Tailor <dev.tailor@...sung.com>
> > ---
> >  drivers/rtc/rtc-s3c.c | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c index
> > 5dd575865adf..8db24b6360b8 100644
> > --- a/drivers/rtc/rtc-s3c.c
> > +++ b/drivers/rtc/rtc-s3c.c
> > @@ -384,6 +384,15 @@ static void s3c6410_rtc_disable(struct s3c_rtc
> *info)
> >  	writew(con, info->base + S3C2410_RTCCON);  }
> >
> > +static void exynosautov9_rtc_disable(struct s3c_rtc *info) {
> > +	unsigned int con;
> > +
> > +	con = readb(info->base + S3C2410_RTCCON);
> > +	con &= ~S3C2410_RTCCON_RTCEN;
> > +	writeb(con, info->base + S3C2410_RTCCON); }
> 
> Looks a lot like s3c24xx_rtc_disable()...
> 
> Anyway, if you keep ignoring the review, no point to provide reviews here.
> 

I have removed the redundant code I had added in V1 considering your review comment for asymmetry code.
s3c24xx_rtc_disable() & s3c6410_rtc_disable() updates additional bit, which is not valid for ExynosAutov9 (only RTCCON[4:0] are valid), hence I added this and mentioned in V2 cover letter as well.
Please let me know if I am missing anything.

> Best regards,
> Krzysztof