linux-kernel - Re: [PATCH 0/2] rtc: pch-rtc: add Intel Series PCH built-in read-only RTC

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Date:   Sun, 15 Aug 2021 01:22:15 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Paul Fertser <fercerpav@...il.com>
Cc:     Ivan Mikhaylov <i.mikhaylov@...ro.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] rtc: pch-rtc: add Intel Series PCH built-in
 read-only RTC

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 driver.
> > Need I cut it off and use I2C_SLAVE_FORCE? I2C_SLAVE_FORCE is not good
> > 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 statuses
> (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 let
you check with Lee...

However, I'm not sure what is the correct interface for poweroff/reboot
control.

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com