linux-kernel - Re: [RFC PATCH 4/4] rtc/imxdi: Update driver to address time issues

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Date:	Fri, 28 Nov 2014 00:24:52 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Xunlei Pang <pang.xunlei@...aro.org>
cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Sven Schnelle <svens@...ckframe.org>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd.bergmann@...aro.org>
Subject: Re: [RFC PATCH 4/4] rtc/imxdi: Update driver to address time
 issues

On Thu, 27 Nov 2014, Xunlei Pang wrote:
> @@ -213,17 +213,16 @@ static int dryice_rtc_set_mmss(struct device *dev, time64_t secs)
>  {
>  	struct imxdi_dev *imxdi = dev_get_drvdata(dev);
>  	int rc;
> +	u32 hwtime;
> +
> +	rc = rtc_time64_to_hw32(secs, &hwtime);
> +	if (rc < 0)
> +		return rc;
>  
>  	/* zero the fractional part first */
>  	rc = di_write_wait(imxdi, 0, DTCLR);
>  	if (rc == 0)
> -		/*
> -		 * y2106 issue:
> -		 *   On 32bit systems the time64_t secs value gets cast to
> -		 *   a 32bit long, and thus we can only write a maximum value
> -		 *   of y2016
> -		 */
> -		rc = di_write_wait(imxdi, secs, DTCMR);
> +		rc = di_write_wait(imxdi, hwtime, DTCMR);

So you repeat the same thing what I complained about last time. First
you add crap to a driver then you remove it again instead of analyzing
the necessary conversions in the first place, provide the
infrastructure and then do a per driver conversion. It's not that
hard, really and I'm getting tired of your approach.

Step 1:	     Provide rtc.set_mmss64

Step 2:	     Implement the epoch helper functions for 32bit hardware

Step 3:	     Convert drivers

Step 4:	     Remove obsolete interfaces

I wont explain that once more, really.

Thanks,

	tglx

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