linux-kernel - Re: [RFC PATCH v4 2/5] mfd: add driver for Marvell 88PM886 PMIC

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Date: Thu, 21 Mar 2024 18:32:03 +0100
From: "Karel Balej" <balejk@...fyz.cz>
To: "Mark Brown" <broonie@...nel.org>
Cc: "Lee Jones" <lee@...nel.org>, "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        "Conor Dooley"
 <conor+dt@...nel.org>,
        "Dmitry Torokhov" <dmitry.torokhov@...il.com>,
        "Liam
 Girdwood" <lgirdwood@...il.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-input@...r.kernel.org>,
        Duje Mihanović <duje.mihanovic@...le.hr>,
        <~postmarketos/upstreaming@...ts.sr.ht>, <phone-devel@...r.kernel.org>
Subject: Re: [RFC PATCH v4 2/5] mfd: add driver for Marvell 88PM886 PMIC

Mark Brown, 2024-03-21T17:17:40+00:00:
> On Thu, Mar 21, 2024 at 06:08:16PM +0100, Karel Balej wrote:
> > Mark Brown, 2024-03-21T16:58:44+00:00:
>
> > > > > > > > +static const struct regmap_config pm886_i2c_regmap = {
> > > > > > > > +	.reg_bits = 8,
> > > > > > > > +	.val_bits = 8,
> > > > > > > > +	.max_register = PM886_REGMAP_CONF_MAX_REG,
> > > > > > > > +};
>
> ...
>
> > > You shouldn't be creating two regmaps for the same set of registers,
> > > that just opens the potential for confusion.
>
> > Just the regmap config is the same. Otherwise, each regmap lives at a
> > different I2C address.
>
> Do they both genuinely have the same maximum register?

They do according to the downstream driver which is my only reference.
In fact, there the driver defines the configs separately for each regmap
but with the same values.