linux-kernel - RE: [PATCH V7 3/3] rtc: zynqmp: Updated calibration value

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Message-ID: <BY5PR12MB4033DC535FF8B1230D5E860493A69@BY5PR12MB4033.namprd12.prod.outlook.com>
Date:   Fri, 10 Jun 2022 15:04:31 +0000
From:   "Neeli, Srinivas" <srinivas.neeli@....com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Srinivas Neeli <srinivas.neeli@...inx.com>
CC:     "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "sgoud@...inx.com" <sgoud@...inx.com>,
        "shubhraj@...inx.com" <shubhraj@...inx.com>,
        "neelisrinivas18@...il.com" <neelisrinivas18@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "git@...inx.com" <git@...inx.com>
Subject: RE: [PATCH V7 3/3] rtc: zynqmp: Updated calibration value

[AMD Official Use Only - General]

Hi,

> -----Original Message-----
> From: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Sent: Friday, June 10, 2022 5:34 PM
> To: Srinivas Neeli <srinivas.neeli@...inx.com>
> Cc: a.zummo@...ertech.it; robh+dt@...nel.org;
> krzysztof.kozlowski+dt@...aro.org; michal.simek@...inx.com;
> sgoud@...inx.com; shubhraj@...inx.com; Neeli, Srinivas
> <srinivas.neeli@....com>; neelisrinivas18@...il.com;
> devicetree@...r.kernel.org; linux-rtc@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; git@...inx.com
> Subject: Re: [PATCH V7 3/3] rtc: zynqmp: Updated calibration value
>
> On 10/06/2022 17:07:09+0530, Srinivas Neeli wrote:
> > As per RTC spec default calibration value is 0x7FFF.
> >
>
> Having that as a second patch breaks the calculation in your previous patch,
> really, this should just be a single patch.

Can I swap 3/3 and 2/3, Will that be fine ?.

>
> > Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
> > ---
> > Changes in V7:
> > -New patch
> > -TRM not updated yet, Internal design document contains 0x7FFF as
> > default value. TRM Will update in next release.
> > ---
> >  drivers/rtc/rtc-zynqmp.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c index
> > 39b23f88ee26..1dd389b891fe 100644
> > --- a/drivers/rtc/rtc-zynqmp.c
> > +++ b/drivers/rtc/rtc-zynqmp.c
> > @@ -37,7 +37,7 @@
> >  #define RTC_OSC_EN         BIT(24)
> >  #define RTC_BATT_EN                BIT(31)
> >
> > -#define RTC_CALIB_DEF              0x198233
> > +#define RTC_CALIB_DEF              0x7FFF
> >  #define RTC_CALIB_MASK             0x1FFFFF
> >  #define RTC_ALRM_MASK          BIT(1)
> >  #define RTC_MSEC               1000
> > --
> > 2.25.1
> >
>
> --
> Alexandre Belloni, co-owner and COO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com