linux-kernel - Re: [PATCH 12/13] regulator: add pm8008 pmic regulator driver

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Date: Wed, 29 May 2024 17:55:15 +0200
From: Johan Hovold <johan@...nel.org>
To: Stephen Boyd <swboyd@...omium.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Johan Hovold <johan+linaro@...nel.org>, Lee Jones <lee@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Das Srinagesh <quic_gurus@...cinc.com>,
	Satya Priya <quic_c_skakit@...cinc.com>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 12/13] regulator: add pm8008 pmic regulator driver

On Thu, May 09, 2024 at 11:10:41AM +0200, Johan Hovold wrote:
> On Wed, May 08, 2024 at 10:37:50PM +0000, Stephen Boyd wrote:
> > Quoting Johan Hovold (2024-05-06 08:08:29)

> > > +struct pm8008_regulator {
> > > +       struct regmap           *regmap;
> > > +       struct regulator_desc   rdesc;
> > > +       u16                     base;
> > > +       int                     step_rate;
> > 
> > Is struct regulator_desc::vsel_step usable for this? If not, can it be
> > unsigned?
> 
> Not sure, I'll take a look when respinning.

No, vsel_step is unrelated to this, which is really a slew rate.

I've reworked the driver and dropped this field in favour of
regulator_desc::ramp_delay.

> > > +};
 
> > > +static int pm8008_regulator_get_voltage(struct regulator_dev *rdev)
> > > +{
> > > +       struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
> > > +       __le16 mV;
> > > +       int uV;

> > > +
> > > +       regmap_bulk_read(pm8008_reg->regmap,
> > > +                       LDO_VSET_LB_REG(pm8008_reg->base), (void *)&mV, 2);
> > 
> > Is struct regulator_desc::vsel_reg usable for this?
> 
> Will look into that.

I don't think vsel_reg can be used here as the voltage is set using two
registers (LSB and MSB).
  
> > > +
> > > +       uV = le16_to_cpu(mV) * 1000;
> > > +       return (uV - pm8008_reg->rdesc.min_uV) / pm8008_reg->rdesc.uV_step;
> > > +}

Johan