linux-kernel - Re: [PATCH v2 13/14] regulator: add pm8008 pmic regulator driver

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Date: Wed, 29 May 2024 23:02:57 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Lee Jones <lee@...nel.org>, Mark Brown <broonie@...nel.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Bjorn Andersson <andersson@...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 Kakitapalli <quic_skakitap@...cinc.com>, Stephen Boyd <swboyd@...omium.org>, 
	"Bryan O'Donoghue" <bryan.odonoghue@...aro.org>, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 13/14] regulator: add pm8008 pmic regulator driver

On Wed, May 29, 2024 at 7:30 PM Johan Hovold <johan+linaro@...nel.org> wrote:
>
> The Qualcomm PM8008 is an I2C-controlled PMIC containing seven LDO
> regulators.
>
> The driver is based on a driver submitted by Satya Priya, but it has
> been cleaned up and reworked to match the new devicetree binding which
> no longer describes each regulator as a separate device.
>
> This avoids describing internal details like register offsets in the
> devicetree and allows for extending the implementation with features
> like over-current protection without having to update the binding.
>
> Specifically note that the regulator interrupts are shared between all
> regulators.
>
> Note that the secondary regmap is looked up by name and that if the
> driver ever needs to be generalised to support regulators provided by
> the primary regmap (I2C address) such information could be added to the
> device-id table.
>
> This also fixes the original implementation, which looked up regulators
> by 'regulator-name' property rather than devicetree node name and which
> prevented the regulators from being named to match board schematics.

..

> +#include <linux/array_size.h>
> +#include <linux/bits.h>
> +#include <linux/device.h>
> +#include <linux/math.h>
> +#include <linux/module.h>

> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/driver.h>

+ types.h

+ asm/byteorder.h

..

> +static int pm8008_regulator_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
> +{
> +       struct pm8008_regulator *preg = rdev_get_drvdata(rdev);
> +       unsigned int mV;
> +       __le16 val;
> +       int ret;
> +
> +       ret = regulator_list_voltage_linear_range(rdev, sel);
> +       if (ret < 0)
> +               return ret;
> +
> +       mV = DIV_ROUND_UP(ret, 1000);

MILLI from units.h ?

> +       val = cpu_to_le16(mV);

> +       ret = regmap_bulk_write(preg->regmap, preg->base + LDO_VSET_LB_REG,
> +                       &val, sizeof(val));
> +       if (ret < 0)
> +               return ret;
> +
> +       return 0;

May be written as

  return regmap_bulk_write(...);

> +}
> +
> +static int pm8008_regulator_get_voltage_sel(struct regulator_dev *rdev)
> +{
> +       struct pm8008_regulator *preg = rdev_get_drvdata(rdev);
> +       unsigned int uV;
> +       __le16 val;
> +       int ret;
> +
> +       ret = regmap_bulk_read(preg->regmap, preg->base + LDO_VSET_LB_REG,
> +                       &val, sizeof(val));
> +       if (ret < 0)
> +               return ret;
> +
> +       uV = le16_to_cpu(val) * 1000;

MILLI ?

> +       return (uV - preg->desc.min_uV) / preg->desc.uV_step;
> +}

..

> +               rdev = devm_regulator_register(dev, desc, &config);
> +               if (IS_ERR(rdev)) {
> +                       ret = PTR_ERR(rdev);
> +                       dev_err(dev, "failed to register regulator %s: %d\n",
> +                                       desc->name, ret);
> +                       return ret;

It's possible to use

  return dev_err_probe(...);

even for non-probe functions.

> +               }
> +       }


-- 
With Best Regards,
Andy Shevchenko