linux-kernel - Re: [linux-sunxi] [PATCH v2 0/3] Add basic support for RTC on Allwinner H6 SoC

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Date:   Sat, 24 Aug 2019 14:58:18 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-sunxi@...glegroups.com, megous@...ous.com
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        devicetree@...r.kernel.org,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org
Subject: Re: [linux-sunxi] [PATCH v2 0/3] Add basic support for RTC on Allwinner H6 SoC

Dne sobota, 24. avgust 2019 ob 14:56:12 CEST je Ondřej Jirman napisal(a):
> Hi,
> 
> On Sat, Aug 24, 2019 at 10:06:14AM +0200, Jernej Škrabec wrote:
> > Dne sobota, 24. avgust 2019 ob 10:04:24 CEST je Jernej Škrabec napisal(a):
> > > Hi!
> > > 
> > > Dne torek, 20. avgust 2019 ob 17:19:31 CEST je megous@...ous.com 
napisal(a):
> > > > From: Ondrej Jirman <megous@...ous.com>
> > > > 
> > > > I went through the datasheets for H6 and H5, and compared the
> > > > differences.
> > > > RTCs are largely similar, but not entirely compatible.
> > > > Incompatibilities
> > > > are in details not yet implemented by the rtc driver though.
> > > > 
> > > > I also corrected the clock tree in H6 DTSI.
> > > > 
> > > > This patchset is necessary for implementing the WiFi/Bluetooth support
> > > > on boards using H6 SoC.
> > > > 
> > > > There was some discussion previously of describing HOSC, DCXO and XO
> > > > oscillators and clocks as part of RTC in DT, but I decided against it
> > > > because it's not necessary, becuse information that would be provided
> > > > as a part of DT can already be determined at runtime from RTC
> > > > registers,
> > > > so this woudn't add any value and would only introduce complications
> > > > to the driver. See: https://patchwork.kernel.org/cover/10898083/
> > > > 
> > > > Please take a look.
> > > > 
> > > > 
> > > > Thank you and regards,
> > > > 
> > > >   Ondrej Jirman
> > > 
> > > Sorry for a bit late test, but with your patches on Tanix TX6 box I get
> > > this in dmesg:
> > > 
> > > [   17.431742] sun6i-rtc 7000000.rtc: Failed to set rtc time.
> > > [   20.439742] sun6i-rtc 7000000.rtc: rtc is still busy.
> > > [   21.435744] sun6i-rtc 7000000.rtc: rtc is still busy.
> > > [   24.055741] sun6i-rtc 7000000.rtc: rtc is still busy.
> > > [   24.439752] sun6i-rtc 7000000.rtc: rtc is still busy.
> > > 
> > > Last line is repeated non-stop.
> > > 
> > > Any idea what could be wrong?
> > 
> > Additional info - this is on kernel 5.2.6 with your patches applied.
> 
> Do you have schematics, or a FEX file for the board or any other info on how
> the RTC is set up on that board?
> 
> Can you dump the RTC register range?

I have only Android DT, but as I already said in latest reply to patch 2, 
changing switch bypass to bit 14 instead of 15 solved all issues.

Best regards,
Jernej

> 
> regards,
> 	o.
> 
> > Best regards,
> > Jernej
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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