From: Alexandre Belloni <alexandre.belloni-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>
To: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Alessandro Zummo
<a.zummo-BfzFCNDTiLLj+vYz1yj4TQ@public.gmane.org>,
devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Maxime Ripard
<maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>,
linux-kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-sunxi <linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
linux-arm-kernel
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
linux-rtc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [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.edhm3qzpegscf2z7-9v8tmBix7cb9zxVx7UNMDg@public.gmane.org>
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
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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 via linux-sunxi
[not found] ` <20190412120730.473-1-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2019-04-12 12:07 ` [PATCH 1/3] dt-bindings: Add compatible for H6 RTC megous via linux-sunxi
[not found] ` <20190412120730.473-2-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2019-08-05 10:16 ` Chen-Yu Tsai
2019-04-12 12:07 ` [PATCH 2/3] rtc: sun6i: Add support " megous via linux-sunxi
[not found] ` <20190412120730.473-3-megous-5qf/QAjKc83QT0dZR+AlfA@public.gmane.org>
2019-08-05 10:16 ` Chen-Yu Tsai
2019-08-05 10:20 ` [linux-sunxi] " Ondřej Jirman
[not found] ` <CAGb2v675j-aCLMgPJOzr9yx1XxsUvHRr_K7VnL=p8mSdwpu2jw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-08-05 10:45 ` Ondřej Jirman
2019-08-05 10:54 ` [linux-sunxi] " Chen-Yu Tsai
[not found] ` <CAGb2v67pcxdxjdRX_HN4133A32eA566DDtUJUKV7pqzxDtOaeg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-08-05 11:10 ` Ondřej Jirman
[not found] ` <20190805111037.76vmanzcurffpbdf-9v8tmBix7cb9zxVx7UNMDg@public.gmane.org>
2019-08-05 11:21 ` Chen-Yu Tsai
2019-08-05 12:16 ` [linux-sunxi] " Clément Péron
2019-04-12 12:07 ` [PATCH 3/3] arm64: dts: sun50i-h6: Add support for RTC and fix the clock tree megous via linux-sunxi
2019-04-15 8:18 ` [PATCH 0/3] Add basic support for RTC on Allwinner H6 SoC Chen-Yu Tsai
[not found] ` <CAGb2v66cbpsoHJoiFJkBwhZ5SbO+uO+Kf6gtnA3kPFQZq0329Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-15 14:22 ` 'Ondřej Jirman' via linux-sunxi
[not found] ` <20190415142222.cytlvz7z3mjf7slm-9v8tmBix7cb9zxVx7UNMDg@public.gmane.org>
2019-04-15 14:33 ` Maxime Ripard
2019-04-15 14:39 ` Chen-Yu Tsai
2019-04-15 14:35 ` Chen-Yu Tsai
[not found] ` <CAGb2v67XBGhoJWho16A3+2axBuTsY+SkYkg1hwQJ0XyPvPeoOw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-15 15:17 ` 'Ondřej Jirman' via linux-sunxi
2019-08-06 18:30 ` Ondřej Jirman
[not found] ` <20190806183045.edhm3qzpegscf2z7-9v8tmBix7cb9zxVx7UNMDg@public.gmane.org>
2019-08-06 22:27 ` Ondřej Jirman
2019-08-07 10:55 ` Alexandre Belloni [this message]
[not found] ` <20190807105502.GK3600-m++hUPXGwpdeoWH0uzbU5w@public.gmane.org>
2019-08-08 5:48 ` Chen-Yu Tsai
2019-08-08 12:12 ` Ondřej Jirman
[not found] ` <20190808121237.g6twq2nh3sayu3vx-9v8tmBix7cb9zxVx7UNMDg@public.gmane.org>
2019-08-08 23:39 ` Alexandre Belloni
[not found] ` <20190808233930.GM3600-m++hUPXGwpdeoWH0uzbU5w@public.gmane.org>
2019-08-09 9:16 ` Ondřej Jirman
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