linux-kernel - Re: [PATCH v10 4/4] rtc: ds1307: add frequency_test_enable sysfs attribute to check tick on m41txx

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Message-ID: <CAHp75VeR8H-XhqkrSxBKoaVwcTx6__w4xpR0x2tm-0dxq9tZrw@mail.gmail.com>
Date:   Wed, 18 Jul 2018 19:26:56 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Giulio Benetti <giulio.benetti@...ronovasrl.com>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 4/4] rtc: ds1307: add frequency_test_enable sysfs
 attribute to check tick on m41txx

On Wed, Jul 18, 2018 at 5:09 PM, Giulio Benetti
<giulio.benetti@...ronovasrl.com> wrote:
> On m41txx you can enable open-drain OUT pin to check if offset is ok.
> Enabling OUT pin with frequency_test_enable attribute, OUT pin will tick
> 512 times faster than 1s tick base.
>
> Enable or Disable FT bit on CONTROL register if freq_test is 1 or 0.

Taking into consideration the amount of patches per hour you need to
slow down a bit.

-- 
With Best Regards,
Andy Shevchenko