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From: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
To: Lee Jones <lee.jones@linaro.org>
Cc: "Rob Herring" <robh+dt@kernel.org>,
	"Dmitry Torokhov" <dmitry.torokhov@gmail.com>,
	"Sebastian Reichel" <sre@kernel.org>,
	"Mark Brown" <broonie@kernel.org>,
	"Manivannan Sadhasivam" <manivannan.sadhasivam@linaro.org>,
	"Liam Girdwood" <lgirdwood@gmail.com>,
	"Andreas Färber" <afaerber@suse.de>,
	linux-actions@lists.infradead.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
	linux-pm@vger.kernel.org
Subject: Re: [PATCH v3 3/7] mfd: Add MFD driver for ATC260x PMICs
Date: Mon, 21 Dec 2020 13:57:13 +0200	[thread overview]
Message-ID: <20201221115713.GA155203@BV030612LT> (raw)
In-Reply-To: <20201221081015.GA4825@dell>

On Mon, Dec 21, 2020 at 08:10:15AM +0000, Lee Jones wrote:
> On Fri, 18 Dec 2020, Cristian Ciocaltea wrote:
> 
> > 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.
> 
> The current patch seems to insinuate that 32 versions are currently
> supported.  What is the chip_rev for the ATC2603C rev.B?

I only own the rev.A for the ATC2603C variant, for which I read '0' from
the chip rev register.

However what really matters for the driver is not the raw value, but the
one computed via:

atc260x->ic_ver = __ffs(chip_rev + 1U);

This is basically a translation of the raw value to a chip version
that is used in the context of the special handling mentioned above:

enum atc260x_ver {
	ATC260X_A = 0,
	ATC260X_B,
	ATC260X_C,
	ATC260X_D,
	ATC260X_E,
	ATC260X_F,
	ATC260X_G,
	ATC260X_H,
};

So we actually could handle up to 8 chip versions with the current
management scheme.

> -- 
> Lee Jones [李琼斯]
> Senior Technical Lead - Developer Services
> Linaro.org │ Open source software for Arm SoCs
> Follow Linaro: Facebook | Twitter | Blog

  reply	other threads:[~2020-12-21 11:58 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-06  1:27 [PATCH v3 0/7] Add initial support " Cristian Ciocaltea
2020-12-06  1:27 ` [PATCH v3 1/7] dt-bindings: input: Add reset-time-sec common property Cristian Ciocaltea
2020-12-10  3:37   ` Rob Herring
2020-12-10  9:13     ` Cristian Ciocaltea
2020-12-11  3:16       ` Rob Herring
2020-12-10  4:06   ` Manivannan Sadhasivam
2020-12-10  9:25     ` Cristian Ciocaltea
2020-12-06  1:27 ` [PATCH v3 2/7] dt-bindings: mfd: Add Actions Semi ATC260x PMIC binding Cristian Ciocaltea
2020-12-11  3:17   ` Rob Herring
2020-12-11 14:17     ` Cristian Ciocaltea
2020-12-06  1:27 ` [PATCH v3 3/7] mfd: Add MFD driver for ATC260x PMICs Cristian Ciocaltea
2020-12-16 10:10   ` Lee Jones
2020-12-17 23:17     ` Cristian Ciocaltea
2020-12-18 13:21       ` Lee Jones
2020-12-18 16:07         ` Cristian Ciocaltea
2020-12-21  8:10           ` Lee Jones
2020-12-21 11:57             ` Cristian Ciocaltea [this message]
2020-12-21 12:18               ` Linus Walleij
2020-12-21 13:44                 ` Cristian Ciocaltea
2020-12-06  1:27 ` [PATCH v3 4/7] regulator: Add regulator " Cristian Ciocaltea
2020-12-07 13:30   ` Mark Brown
2020-12-07 22:54     ` Cristian Ciocaltea
2020-12-06  1:27 ` [PATCH v3 5/7] power: reset: Add poweroff " Cristian Ciocaltea
2020-12-06  1:27 ` [PATCH v3 6/7] input: atc260x: Add onkey " Cristian Ciocaltea
2020-12-06  3:13   ` Dmitry Torokhov
2020-12-06 13:44     ` Cristian Ciocaltea
2020-12-06  1:27 ` [PATCH v3 7/7] MAINTAINERS: Add entry for ATC260x PMIC Cristian Ciocaltea

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