linux-kernel - Re: [PATCH v3 2/3] rtc: s3c: support for exynosautov9 on-chip RTC

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Message-ID: <20250905140318.GA14745@grimfrac.localdomain>
Date: Fri, 5 Sep 2025 16:03:18 +0200
From: Henrik Grimler <henrik@...mler.se>
To: Devang Tailor <dev.tailor@...sung.com>
Cc: alexandre.belloni@...tlin.com, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, alim.akhtar@...sung.com,
	linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	faraz.ata@...sung.com
Subject: Re: [PATCH v3 2/3] rtc: s3c: support for exynosautov9 on-chip RTC

Hi Devang,

On Fri, Sep 05, 2025 at 04:35:53PM +0530, Devang Tailor wrote:
> The on-chip RTC of this SoC is almost similar to the previous version of
> SoCs except for S3C2410_TICNT tick time counter, which is used in this
> driver but not applicable for exynosautov9. So re-use the existing driver
> skipping disablement of S3C2410_TICNT in s3c24xx_rtc_disable() callback
> via a new boolean member of s3c_rtc_data.
> 
> This has been tested with 'hwclock' & 'date' utilities
> 
> Suggested-by: Henrik Grimler <henrik@...mler.se>
> Signed-off-by: Devang Tailor <dev.tailor@...sung.com>

Reviewed-by: Henrik Grimler <henrik@...mler.se>

Thank you, looks good!

Best regards,
Henrik Grimler

> ---
>  drivers/rtc/rtc-s3c.c | 21 ++++++++++++++++++---
>  1 file changed, 18 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
> index 79b2a16f15ad..8fc5b4582b6d 100644
> --- a/drivers/rtc/rtc-s3c.c
> +++ b/drivers/rtc/rtc-s3c.c
> @@ -48,6 +48,7 @@ struct s3c_rtc {
>  
>  struct s3c_rtc_data {
>  	bool needs_src_clk;
> +	bool use_s3c2410_ticnt;
>  
>  	void (*irq_handler) (struct s3c_rtc *info, int mask);
>  	void (*enable) (struct s3c_rtc *info);
> @@ -369,9 +370,11 @@ static void s3c24xx_rtc_disable(struct s3c_rtc *info)
>  	con &= ~S3C2410_RTCCON_RTCEN;
>  	writew(con, info->base + S3C2410_RTCCON);
>  
> -	con = readb(info->base + S3C2410_TICNT);
> -	con &= ~S3C2410_TICNT_ENABLE;
> -	writeb(con, info->base + S3C2410_TICNT);
> +	if (info->data->use_s3c2410_ticnt) {
> +		con = readb(info->base + S3C2410_TICNT);
> +		con &= ~S3C2410_TICNT_ENABLE;
> +		writeb(con, info->base + S3C2410_TICNT);
> +	}
>  }
>  
>  static void s3c6410_rtc_disable(struct s3c_rtc *info)
> @@ -550,18 +553,21 @@ static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
>  }
>  
>  static const struct s3c_rtc_data s3c2410_rtc_data = {
> +	.use_s3c2410_ticnt	= true,
>  	.irq_handler		= s3c24xx_rtc_irq,
>  	.enable			= s3c24xx_rtc_enable,
>  	.disable		= s3c24xx_rtc_disable,
>  };
>  
>  static const struct s3c_rtc_data s3c2416_rtc_data = {
> +	.use_s3c2410_ticnt	= true,
>  	.irq_handler		= s3c24xx_rtc_irq,
>  	.enable			= s3c24xx_rtc_enable,
>  	.disable		= s3c24xx_rtc_disable,
>  };
>  
>  static const struct s3c_rtc_data s3c2443_rtc_data = {
> +	.use_s3c2410_ticnt	= true,
>  	.irq_handler		= s3c24xx_rtc_irq,
>  	.enable			= s3c24xx_rtc_enable,
>  	.disable		= s3c24xx_rtc_disable,
> @@ -574,6 +580,12 @@ static const struct s3c_rtc_data 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		= s3c24xx_rtc_disable,
> +};
> +
>  static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
>  	{
>  		.compatible = "samsung,s3c2410-rtc",
> @@ -590,6 +602,9 @@ 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
>