From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Chen-Yu Tsai <wens@csie.org>, Mark Rutland <mark.rutland@arm.com>,
Alessandro Zummo <a.zummo@towertech.it>,
devicetree <devicetree@vger.kernel.org>,
Maxime Ripard <maxime.ripard@bootlin.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-sunxi <linux-sunxi@googlegroups.com>,
Rob Herring <robh+dt@kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-rtc@vger.kernel.org
Subject: Re: [linux-sunxi] [PATCH 0/3] Add basic support for RTC on Allwinner H6 SoC
Date: Wed, 7 Aug 2019 12:55:02 +0200 [thread overview]
Message-ID: <20190807105502.GK3600@piout.net> (raw)
In-Reply-To: <20190806183045.edhm3qzpegscf2z7@core.my.home>
Hi,
On 06/08/2019 20:30:45+0200, Ondřej Jirman wrote:
> Maybe whether XO or DCXO is used also matters if you want to do some fine
> tunning of DCXO (control register has pletny of options), but that's probably
> better done in u-boot. And there's still no need to read HOSC source from DT.
> The driver can just check compatible, and if it is H6 and OSC_CLK_SRC_SEL is 1,
> it can do it's DCXO tunning, or whatever. But neither OS nor bootloader will
> be using this info to gate/disable the osciallator.
>
It is actually useful to be able to tweak the crystal tuning at
runtime to be able to reduce clock drift and compare with a reliable
source (e.g. NTP).
I'm curious, what kind of options does this RTC have?
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
next prev parent reply other threads:[~2019-08-07 10:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-12 12:07 [PATCH 0/3] Add basic support for RTC on Allwinner H6 SoC megous
2019-04-12 12:07 ` [PATCH 1/3] dt-bindings: Add compatible for H6 RTC megous
2019-08-05 10:16 ` [linux-sunxi] " Chen-Yu Tsai
2019-04-12 12:07 ` [PATCH 2/3] rtc: sun6i: Add support " megous
2019-08-05 10:16 ` [linux-sunxi] " Chen-Yu Tsai
2019-08-05 10:20 ` Ondřej Jirman
2019-08-05 10:45 ` Ondřej Jirman
2019-08-05 10:54 ` Chen-Yu Tsai
2019-08-05 11:10 ` Ondřej Jirman
2019-08-05 11:21 ` Chen-Yu Tsai
2019-08-05 12:16 ` Clément Péron
2019-04-12 12:07 ` [PATCH 3/3] arm64: dts: sun50i-h6: Add support for RTC and fix the clock tree megous
2019-04-15 8:18 ` [linux-sunxi] [PATCH 0/3] Add basic support for RTC on Allwinner H6 SoC Chen-Yu Tsai
2019-04-15 14:22 ` Ondřej Jirman
2019-04-15 14:33 ` Maxime Ripard
2019-04-15 14:39 ` Chen-Yu Tsai
2019-04-15 14:35 ` Chen-Yu Tsai
2019-04-15 15:17 ` Ondřej Jirman
2019-08-06 18:30 ` Ondřej Jirman
2019-08-06 22:27 ` Ondřej Jirman
2019-08-07 10:55 ` Alexandre Belloni [this message]
2019-08-08 5:48 ` Chen-Yu Tsai
2019-08-08 12:12 ` Ondřej Jirman
2019-08-08 23:39 ` Alexandre Belloni
2019-08-09 9:16 ` Ondřej Jirman
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