From: alexandre.belloni@free-electrons.com (Alexandre Belloni)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/3] Extend rtc-armada38x support for Armada 7K/8K
Date: Mon, 20 Feb 2017 19:17:12 +0100 [thread overview]
Message-ID: <20170220181712.yejnobmj3dhm5ev6@piout.net> (raw)
In-Reply-To: <20170220175054.GP21222@n2100.armlinux.org.uk>
On 20/02/2017 at 17:50:54 +0000, Russell King - ARM Linux wrote:
> > The question being what does that do and whether it could be done in the
> > driver instead.
>
> It's not specific to the Armada 8040, the same problem exists with
> Armada 38x, so holding this up for that reason does not make sense.
>
I agree, I will not delay the patch for that.
> I suspect that the errata is "RTC is not reset at power up" for the RTC
> power domain.
>
> I don't know where the value of 0x2000 comes from for the correction
> value, all I know is that's the value uboot uses with "date reset".
> We probably do _not_ want the driver writing that each time the
> kernel boots, since that's a tuning parameter.
>
It is probably a calibration offset. It may be worth exposing to
userspace but without more information, I doubt we can make something
useful out of it.
--
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
prev parent reply other threads:[~2017-02-20 18:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-17 10:19 [PATCH v2 0/3] Extend rtc-armada38x support for Armada 7K/8K Gregory CLEMENT
2017-02-17 10:19 ` [PATCH v2 1/3] rtc: armada38x: Prepare driver to manage different versions Gregory CLEMENT
2017-02-17 10:19 ` [PATCH v2 2/3] rtc: armada38x: Add support for Armada 7K/8K Gregory CLEMENT
2017-02-17 10:19 ` [PATCH v2 3/3] arm64: dts: marvell: add RTC description " Gregory CLEMENT
2017-02-20 17:06 ` [PATCH v2 0/3] Extend rtc-armada38x support " Gregory CLEMENT
2017-02-20 17:27 ` Russell King - ARM Linux
2017-02-20 17:36 ` Gregory CLEMENT
2017-02-20 17:42 ` Russell King - ARM Linux
2017-02-20 17:36 ` Alexandre Belloni
2017-02-20 17:43 ` Gregory CLEMENT
2017-02-20 17:50 ` Russell King - ARM Linux
2017-02-20 18:17 ` Alexandre Belloni [this message]
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