From: Alexandre Belloni <firstname.lastname@example.org>
To: Milton Miller II <email@example.com>
Cc: Paul Fertser <firstname.lastname@example.org>,
Ivan Mikhaylov <email@example.com>,
Alessandro Zummo <firstname.lastname@example.org>
Subject: Re: [PATCH 0/2] rtc: pch-rtc: add Intel Series PCH built-in read-only RTC
Date: Tue, 17 Aug 2021 22:05:45 +0200 [thread overview]
Message-ID: <YRwWmeQiVC3dGAjH@piout.net> (raw)
On 17/08/2021 18:04:09+0000, Milton Miller II wrote:
> On Aug 16, 2021, Alexandre Belloni wrote:
> >On 15/08/2021 01:42:15+0300, Paul Fertser wrote:
> >> On Tue, Aug 10, 2021 at 06:44:34PM +0300, Ivan Mikhaylov wrote:
> >> > Add RTC driver with dt binding tree document. Also this driver
> >adds one sysfs
> >> > attribute for host power control which I think is odd for RTC
> >> > Need I cut it off and use I2C_SLAVE_FORCE? I2C_SLAVE_FORCE is not
> >> > way too from my point of view. Is there any better approach?
> >> Reading the C620 datasheet I see this interface also allows other
> >> commands (wake up, watchdog feeding, reboot etc.) and reading
> >> (e.g Intruder Detect, POWER_OK_BAD).
> >> I think if there's any plan to use anything other but RTC via this
> >> interface then the driver should be registered as an MFD.
> >This is not the current thinking, if everything is integrated, then
> >there is no issue registering a watchdog from the RTC driver. I'll
> >you check with Lee...
> I think the current statement is "if they are truly disjoint
> hardware controls" then an MFD might suffice, but if they require
> software cordination the new auxillary bus seems to be desired.
Honestly, the auxiliary bus doesn't provide anything that you can't do
by registering a device in multiple subsystem from a single driver.
(Lee Jones, Mark Brown and I did complain at the time that this was yet
another back channel for misuses).
> >>However, I'm not sure what is the correct interface for
> While there is a gpio interface to a simple regulator switch,
> the project to date has been asserting direct or indirect
> gpios etc to control the host. If these are events to
> trigger a change in state and not a direct state change
> that some controller trys to follow, maybe a message delivery
> model? (this is not to reboot or cycle the bmc).
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
next prev parent reply other threads:[~2021-08-17 20:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-10 15:44 [PATCH 0/2] rtc: pch-rtc: add Intel Series PCH built-in read-only RTC Ivan Mikhaylov
2021-08-10 15:44 ` [PATCH 1/2] rtc: pch-rtc: add RTC driver for Intel Series PCH Ivan Mikhaylov
2021-08-14 22:52 ` Paul Fertser
2021-08-20 12:34 ` Ivan Mikhaylov
2021-09-25 22:24 ` Alexandre Belloni
2021-08-10 15:44 ` [PATCH 2/2] dt-bindings: rtc: provide RTC PCH device tree binding doc Ivan Mikhaylov
2021-08-14 22:42 ` [PATCH 0/2] rtc: pch-rtc: add Intel Series PCH built-in read-only RTC Paul Fertser
2021-08-14 23:22 ` Alexandre Belloni
2021-08-17 18:04 ` Milton Miller II
2021-08-17 20:05 ` Alexandre Belloni [this message]
2021-08-30 11:56 ` Ivan Mikhaylov
2021-09-14 23:52 ` Ivan Mikhaylov
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