linux-kernel - Re: [PATCH v2 1/3] dt-bindings: rtc: pcf8523: add DSM pm option for battery switch-over

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Message-ID: <20200727161632.GF239143@piout.net>
Date:   Mon, 27 Jul 2020 18:16:32 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Jon Nettleton <jon@...id-run.com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Rob Herring <robh@...nel.org>,
        Miguel Borges de Freitas <miguelborgesdefreitas@...il.com>,
        a.zummo@...ertech.it, Baruch Siach <baruch@...s.co.il>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] dt-bindings: rtc: pcf8523: add DSM pm option for
 battery switch-over

On 27/07/2020 17:55:50+0200, Jon Nettleton wrote:
> > So, can we please have that discussion, it is pertinent to this patch.
> >
> 
> Thinking about this some more, I believe whether or not an IOCTL
> interface is in the works or needed is irrelevant.  This patch
> describes the hardware and how it is designed and the topic of
> discussion is if we need a simple boolean state, or if we need
> something that could be used to support dynamic configuration in the
> future.  I would rather make this decision now rather than keep
> tacking on boolean config options, or revisit a bunch of device-tree
> changes.

Something that would describe the hardware is a property telling whether
the filter is present on VDD, not a property selecting DSM. The driver
can then chose to avoid standard mode when needed.

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