linux-kernel - Re: [RFC PATCH v3 2/5] mfd: add driver for Marvell 88PM886 PMIC

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Date: Tue, 05 Mar 2024 19:53:52 +0100
From: "Karel Balej" <karelb@...li.ms.mff.cuni.cz>
To: "Lee Jones" <lee@...nel.org>
Cc: "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>, "Mark Brown" <broonie@...nel.org>,
 <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 v3 2/5] mfd: add driver for Marvell 88PM886 PMIC

Lee Jones, 2024-03-05T11:44:18+00:00:
> > +static struct mfd_cell pm886_devs[] = {
> > +	{
> > +		.name = "88pm886-onkey",
> > +		.num_resources = ARRAY_SIZE(pm886_onkey_resources),
> > +		.resources = pm886_onkey_resources,
> > +	},
> > +	{
> > +		.name = "88pm886-regulator",
> > +		.id = PM886_REGULATOR_ID_LDO2,
>
> Why doesn't PLATFORM_DEVID_AUTO work for this device?

Because I am using the IDs in the regulator driver to determine which
regulator data to use/which regulator to register.

> > +static int pm886_initialize_subregmaps(struct pm886_chip *chip)
> > +{
> > +	struct device *dev = &chip->client->dev;
> > +	struct i2c_client *page;
> > +	struct regmap *regmap;
> > +	int err;
> > +
> > +	/* regulators page */
> > +	page = devm_i2c_new_dummy_device(dev, chip->client->adapter,
> > +				chip->client->addr + PM886_PAGE_OFFSET_REGULATORS);
> > +	if (IS_ERR(page)) {
> > +		err = PTR_ERR(page);
> > +		dev_err(dev, "Failed to initialize regulators client: %d\n", err);
> > +		return err;
> > +	}
> > +	regmap = devm_regmap_init_i2c(page, &pm886_i2c_regmap);
> > +	if (IS_ERR(regmap)) {
> > +		err = PTR_ERR(regmap);
> > +		dev_err(dev, "Failed to initialize regulators regmap: %d\n", err);
> > +		return err;
> > +	}
> > +	chip->regmaps[PM886_REGMAP_REGULATORS] = regmap;
>
> Except for the regulator driver, where else is the regulators regmap used?

Nowhere, at least as of now. So you are saying that I should initialize
the regmap in the regulator driver?

Thank you,
K. B.