From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.free-electrons.com (down.free-electrons.com. [37.187.137.238]) by gmr-mx.google.com with ESMTP id w128si11217wmd.0.2016.02.24.14.25.56 for ; Wed, 24 Feb 2016 14:25:56 -0800 (PST) Date: Wed, 24 Feb 2016 23:25:55 +0100 From: Alexandre Belloni To: Joshua Henderson Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Alessandro Zummo , rtc-linux@googlegroups.com Subject: [rtc-linux] Re: [PATCH v2 2/2] rtc: rtc-pic32: Add PIC32 real time clock driver Message-ID: <20160224222555.GA12073@piout.net> References: <1455905390-3491-2-git-send-email-joshua.henderson@microchip.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 In-Reply-To: <1455905390-3491-2-git-send-email-joshua.henderson@microchip.com> Reply-To: rtc-linux@googlegroups.com List-ID: List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , Hi, On 19/02/2016 at 11:09:45 -0700, Joshua Henderson wrote : > +static int pic32_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) > +{ > + struct pic32_rtc_dev *pdata = dev_get_drvdata(dev); > + void __iomem *base = pdata->reg_base; > + unsigned int tries = 0; > + > + clk_enable(pdata->clk); > + > + do { > + rtc_tm->tm_hour = readb(base + PIC32_RTCHOUR); > + rtc_tm->tm_min = readb(base + PIC32_RTCMIN); > + rtc_tm->tm_mon = readb(base + PIC32_RTCMON); > + rtc_tm->tm_mday = readb(base + PIC32_RTCDAY); > + rtc_tm->tm_year = readb(base + PIC32_RTCYEAR); > + rtc_tm->tm_sec = readb(base + PIC32_RTCSEC); > + > + /* > + * The only way to work out whether the system was mid-update > + * when we read it is to check the second counter, and if it > + * is zero, then we re-try the entire read. > + */ > + tries = 1; > + } while (rtc_tm->tm_sec == 0 && tries < 2); > + This doesn't seem right. It will wait up to a second as tries will always be less than 2, this is probably not what you want. > + rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec); > + rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min); > + rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour); > + rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday); > + rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon) - 1; > + rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year); > + > + rtc_tm->tm_year += 100; > + > + dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n", > + 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, > + rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); > + > + clk_disable(pdata->clk); > + return rtc_valid_tm(rtc_tm); > +} > + -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- -- You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. --- You received this message because you are subscribed to the Google Groups "rtc-linux" group. To unsubscribe from this group and stop receiving emails from it, send an email to rtc-linux+unsubscribe@googlegroups.com. For more options, visit https://groups.google.com/d/optout.