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

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Message-ID: <000001dc1d7c$3ac93f90$b05bbeb0$@samsung.com>
Date: Thu, 4 Sep 2025 14:43:48 +0530
From: "Devang Tailor" <dev.tailor@...sung.com>
To: "'Henrik Grimler'" <henrik@...mler.se>
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,


> -----Original Message-----
> From: Henrik Grimler <henrik@...mler.se>
> Sent: 04 September 2025 00:51
> 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
> 
> Hi Devang,
> 
> 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.
> 
> Could you please describe what the differences are to previous SoCs?
> You write almost similar, please elaborate in what way in commit message.

Ok. I will add in V3.

> 
> > 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); }
> 
> Rather than adding a new rtc_disable variant I think this could be handled
in
> existing s3c24xx_rtc_disable (and I think that is what Krzysztof meant).
How
> about adding a new bool to rtc_data that describes if S3C2410_TICNT reg is
> supported or not, and checking it in s3c24xx_rtc_disable?

Ok. I will add bool 'use_s3c2410_ticnt´ to differentiate if any variant uses
TICNT or not, making it
'true' for existing RTC variants which are using s3c24xx_rtc_disable().

> 
> Best regards,
> Henrik Grimler
> 
> >  static void s3c_rtc_remove(struct platform_device *pdev)  {
> >  	struct s3c_rtc *info = platform_get_drvdata(pdev); @@ -574,6 +583,12
> > @@ static struct s3c_rtc_data const s3c6410_rtc_data = {
> >  	.disable		= s3c6410_rtc_disable,
> >  };
> >
> > +static const struct s3c_rtc_data exynosautov9_rtc_data = {
> > +	.irq_handler		= s3c6410_rtc_irq,
> > +	.enable			= s3c24xx_rtc_enable,
> > +	.disable		= exynosautov9_rtc_disable,
> > +};
> > +
> >  static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
> >  	{
> >  		.compatible = "samsung,s3c2410-rtc", @@ -590,6 +605,9 @@
> static
> > const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
> >  	}, {
> >  		.compatible = "samsung,exynos3250-rtc",
> >  		.data = &s3c6410_rtc_data,
> > +	}, {
> > +		.compatible = "samsung,exynosautov9-rtc",
> > +		.data = &exynosautov9_rtc_data,
> >  	},
> >  	{ /* sentinel */ },
> >  };
> > --
> > 2.34.1
> >
> >