linux-kernel - Re: [PATCH v3 3/7] mfd: Add MFD driver for ATC260x PMICs

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Message-ID: <20201218160710.GA134686@BV030612LT>
Date:   Fri, 18 Dec 2020 18:07:10 +0200
From:   Cristian Ciocaltea <cristian.ciocaltea@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Andreas Färber <afaerber@...e.de>,
        linux-actions@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 3/7] mfd: Add MFD driver for ATC260x PMICs

On Fri, Dec 18, 2020 at 01:21:39PM +0000, Lee Jones wrote:
> On Fri, 18 Dec 2020, Cristian Ciocaltea wrote:
> 
> > Hi Lee,
> > 
> > Thank you for the detailed review!
> > 
> > I will prepare a new revision, but there are still a couple of open
> > points..
> 
> Could you please snip your replies, leaving only the open points.
> 
> Scrolling through lots of empty quotes or "done" comments is quite
> time consuming.  Thanks.

Sure, I'll take that into account.

> [...]
> 
> > > > +	ret = regmap_read(atc260x->regmap, atc260x->rev_reg, &chip_rev);
> > > > +	if (ret) {
> > > > +		dev_err(dev, "Failed to get chip revision\n");
> > > > +		return ret;
> > > > +	}
> > > > +
> > > > +	if (chip_rev < 0 || chip_rev > 31) {
> > > > +		dev_err(dev, "Unknown chip revision: %d\n", ret);
> > > > +		return -EINVAL;
> > > > +	}
> > > 
> > > This still seems limiting.
> > 
> > This is based on the vendor implementation. Unfortunately I don't have
> > access to a data sheet or any other source of information about the
> > management of the chip revisions.
> 
> So which versions does this driver work with?  All 32?

I'm not even sure there are so many revisions, I guess that's just a
rough validation for a vendor reserved range.

For the moment, the only place where the functionality is affected
by the chip revision is in the regulator driver - there is a special
handling for the ATC2603C rev.B chip variant.

I expect some additional handling might be required for new drivers
bringing support for the other functions provided by the hardware.

> [...]

Thanks,
Cristi