linux-kernel - Re: [RFC PATCH v3 0/7] Add virtio

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Date: Wed, 13 Mar 2024 21:12:39 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: David Woodhouse <dwmw2@...radead.org>,
	Peter Hilber <peter.hilber@...nsynergy.com>,
	linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
	virtio-dev@...ts.oasis-open.org,
	linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org,
	"virtio-comment@...ts.oasis-open.org" <virtio-comment@...ts.oasis-open.org>,
	"Christopher S. Hall" <christopher.s.hall@...el.com>,
	Jason Wang <jasowang@...hat.com>, John Stultz <jstultz@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
	Richard Cochran <richardcochran@...il.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Marc Zyngier <maz@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	"Ridoux, Julien" <ridouxj@...zon.com>
Subject: Re: [RFC PATCH v3 0/7] Add virtio_rtc module and related changes

> As long as it doesn't behave differently from the other RTC, I'm fine
> with this. This is important because I don't want to carry any special
> infrastructure for this driver or to have to special case this driver
> later on because it is incompatible with some evolution of the
> subsystem.

Maybe deliberately throw away all the sub-second accuracy when
accessing the time via the RTC API? That helps to make it look like an
RTC. And when doing the rounding, add a constant offset of 10ms to
emulate the virtual i2c bus it is hanging off, like most RTCs?

	  Andrew