linux-kernel - Re: [PATCH V12 7/9] regulator: Add a regulator driver for the PM8008 PMIC

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Message-ID: <CAE-0n51JeC7oobCYNCJ-rOi3n_FVPBjz7yFmtwKEDeqWcX0vFw@mail.gmail.com>
Date:   Mon, 16 May 2022 12:03:08 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Satya Priya <quic_c_skakit@...cinc.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_collinsd@...cinc.com, quic_subbaram@...cinc.com,
        quic_jprakash@...cinc.com
Subject: Re: [PATCH V12 7/9] regulator: Add a regulator driver for the PM8008 PMIC

Quoting Satya Priya (2022-05-11 06:18:31)
> diff --git a/drivers/regulator/qcom-pm8008-regulator.c b/drivers/regulator/qcom-pm8008-regulator.c
> new file mode 100644
> index 0000000..0361f02
> --- /dev/null
> +++ b/drivers/regulator/qcom-pm8008-regulator.c
> @@ -0,0 +1,221 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2022, The Linux Foundation. All rights reserved. */
> +
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/qcom_pm8008.h>
> +#include <linux/module.h>
> +#include <linux/of.h>

Is this include used?

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

Is this include used?

> +
> +#define VSET_STEP_MV                   8
> +#define VSET_STEP_UV                   (VSET_STEP_MV * 1000)
> +
> +#define LDO_ENABLE_REG(base)           ((base) + 0x46)
> +#define ENABLE_BIT                     BIT(7)
> +
> +#define LDO_VSET_LB_REG(base)          ((base) + 0x40)
> +
> +#define LDO_STEPPER_CTL_REG(base)      ((base) + 0x3b)
> +#define DEFAULT_VOLTAGE_STEPPER_RATE   38400
> +#define STEP_RATE_MASK                 GENMASK(1, 0)
> +
> +struct pm8008_regulator_data {
> +       const char                      *name;
> +       const char                      *supply_name;
> +       int                             min_uv;
> +       int                             max_uv;
> +       int                             min_dropout_uv;
> +       const struct linear_range       *voltage_range;
> +};
> +
> +struct pm8008_regulator {
> +       struct device           *dev;
> +       struct regmap           *regmap;
> +       struct regulator_desc   rdesc;
> +       u16                     base;
> +       int                     step_rate;
> +       int                     voltage_selector;
> +};
> +
> +static const struct linear_range nldo_ranges[] = {
> +       REGULATOR_LINEAR_RANGE(528000, 0, 122, 8000),
> +};
> +
> +static const struct linear_range pldo_ranges[] = {
> +       REGULATOR_LINEAR_RANGE(1504000, 0, 237, 8000),
> +};
> +
> +static const struct pm8008_regulator_data reg_data[] = {
> +       /* name  parent       min_uv  max_uv  headroom_uv voltage_range */
> +       { "ldo1", "vdd_l1_l2", 528000, 1504000, 225000, nldo_ranges, },
> +       { "ldo2", "vdd_l1_l2", 528000, 1504000, 225000, nldo_ranges, },
> +       { "ldo3", "vdd_l3_l4", 1504000, 3400000, 300000, pldo_ranges, },
> +       { "ldo4", "vdd_l3_l4", 1504000, 3400000, 300000, pldo_ranges, },
> +       { "ldo5", "vdd_l5",    1504000, 3400000, 200000, pldo_ranges, },
> +       { "ldo6", "vdd_l6",    1504000, 3400000, 200000, pldo_ranges, },
> +       { "ldo7", "vdd_l7",    1504000, 3400000, 200000, pldo_ranges, },
> +};
> +
> +static int pm8008_regulator_get_voltage(struct regulator_dev *rdev)
> +{
> +       struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
> +
> +       return pm8008_reg->voltage_selector;
> +}
> +
> +static inline int pm8008_write_voltage(struct pm8008_regulator *pm8008_reg,
> +                                                       int mV)
> +{
> +       __le16 vset_raw;
> +
> +       vset_raw = cpu_to_le16(mV);
> +
> +       return regmap_bulk_write(pm8008_reg->regmap,
> +                       LDO_VSET_LB_REG(pm8008_reg->base),
> +                       (const void *)&vset_raw, sizeof(vset_raw));

Does sparse complain about casting away __le16?

> +}
> +
> +static int pm8008_regulator_set_voltage_time(struct regulator_dev *rdev,
> +                               int old_uV, int new_uv)
> +{
> +       struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
> +
> +       return DIV_ROUND_UP(abs(new_uv - old_uV), pm8008_reg->step_rate);
> +}
> +