linux-kernel - Re: [PATCH V6 2/2] rtc: zynqmp: Add calibration set and get support

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Message-ID: <87r13x28o4.fsf@dell.be.48ers.dk>
Date:   Thu, 09 Jun 2022 16:50:03 +0200
From:   Peter Korsgaard <peter@...sgaard.com>
To:     Srinivas Neeli <srinivas.neeli@...inx.com>
Cc:     <a.zummo@...ertech.it>, <alexandre.belloni@...tlin.com>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <michal.simek@...inx.com>, <sgoud@...inx.com>,
        <shubhraj@...inx.com>, <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 V6 2/2] rtc: zynqmp: Add calibration set and get support

>>>>> "Srinivas" == Srinivas Neeli <srinivas.neeli@...inx.com> writes:

 > Zynqmp RTC controller has a calibration feature to compensate
 > time deviation due to input clock inaccuracy.
 > Set and get calibration API's are used for setting and getting
 > calibration value from the controller calibration register.
 > As per RTC spec default calibration value is 0x7FFF.

Where do you see that? ug1085 rev2.2 still lists:

Programming Sequences
init rtc
1. Write the value 0019_8231h into the calibration register, CALIB_WRITE.


-- 
Bye, Peter Korsgaard