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 10:04:24 +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>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-rtc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [linux-sunxi] [PATCH v2 0/3] Add basic support for RTC on Allwinner H6 SoC

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?

Best regards,
Jernej