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Date: Thu, 9 Jun 2022 10:50:27 +0530
From: "Satya Priya Kakitapalli (Temp)" <quic_c_skakit@...cinc.com>
To: Stephen Boyd <swboyd@...omium.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Rob Herring <robh+dt@...nel.org>
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 V14 7/9] regulator: Add a regulator driver for the PM8008
PMIC
Hi Stephen,
On 6/9/2022 1:12 AM, Stephen Boyd wrote:
> Quoting Satya Priya (2022-06-07 04:50:13)
>> diff --git a/drivers/regulator/qcom-pm8008-regulator.c b/drivers/regulator/qcom-pm8008-regulator.c
>> new file mode 100644
>> index 0000000..71cb95c
>> --- /dev/null
>> +++ b/drivers/regulator/qcom-pm8008-regulator.c
>> @@ -0,0 +1,248 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
>> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. 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>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +#include <linux/regulator/driver.h>
>> +
>> +#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)
>> +
>> +#define NLDO_MIN_UV 528000
>> +#define NLDO_MAX_UV 1504000
>> +
>> +#define PLDO_MIN_UV 1504000
>> +#define PLDO_MAX_UV 3400000
>> +
>> +struct pm8008_regulator_data {
>> + const char *name;
>> + const char *supply_name;
>> + int min_dropout_uv;
>> + const struct linear_range *voltage_range;
>> +};
>> +
>> +struct pm8008_regulator {
>> + struct device *dev;
> Is this used anywhere?
Will remove it.
>> + 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_assert(ARRAY_SIZE(pldo_ranges) == 1 && ARRAY_SIZE(nldo_ranges) == 1);
> Can this static_assert be placed next to the assignment of
> n_linear_ranges in probe?
>
>> +
>> +static const struct pm8008_regulator_data reg_data[] = {
>> + /* name parent headroom_uv voltage_range */
>> + { "ldo1", "vdd_l1_l2", 225000, nldo_ranges, },
>> + { "ldo2", "vdd_l1_l2", 225000, nldo_ranges, },
>> + { "ldo3", "vdd_l3_l4", 300000, pldo_ranges, },
>> + { "ldo4", "vdd_l3_l4", 300000, pldo_ranges, },
>> + { "ldo5", "vdd_l5", 200000, pldo_ranges, },
>> + { "ldo6", "vdd_l6", 200000, pldo_ranges, },
>> + { "ldo7", "vdd_l7", 200000, pldo_ranges, },
>> +};
>> +
>> +static int pm8008_regulator_get_voltage(struct regulator_dev *rdev)
>> +{
>> + struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
>> + __le16 mV;
>> + int rc, uV;
>> +
>> + regmap_bulk_read(pm8008_reg->regmap,
>> + LDO_VSET_LB_REG(pm8008_reg->base), (void *)&mV, 2);
>> +
>> + uV = le16_to_cpu(mV) * 1000;
>> + return (uV - pm8008_reg->rdesc.min_uV) / pm8008_reg->rdesc.uV_step;
>> +}
>> +
>> +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));
>> +}
>> +
>> +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);
>> +}
>> +
>> +static int pm8008_regulator_set_voltage(struct regulator_dev *rdev,
>> + unsigned int selector)
>> +{
>> + struct pm8008_regulator *pm8008_reg = rdev_get_drvdata(rdev);
>> + int rc, mV;
>> +
>> + rc = regulator_list_voltage_linear_range(rdev, selector);
>> + if (rc < 0)
>> + return rc;
>> +
>> + /* voltage control register is set with voltage in millivolts */
>> + mV = DIV_ROUND_UP(rc, 1000);
>> +
>> + rc = pm8008_write_voltage(pm8008_reg, mV);
>> + if (rc < 0)
>> + return rc;
>> +
>> + pm8008_reg->voltage_selector = selector;
> Is this used anywhere? I think not so remove it and the struct member?
Okay.
>> +
>> + return 0;
>> +}
>> +
>> +static const struct regulator_ops pm8008_regulator_ops = {
>> + .enable = regulator_enable_regmap,
>> + .disable = regulator_disable_regmap,
>> + .is_enabled = regulator_is_enabled_regmap,
>> + .set_voltage_sel = pm8008_regulator_set_voltage,
>> + .get_voltage_sel = pm8008_regulator_get_voltage,
>> + .list_voltage = regulator_list_voltage_linear,
>> + .set_voltage_time = pm8008_regulator_set_voltage_time,
>> +};
>> +
>> +static int pm8008_regulator_probe(struct platform_device *pdev)
>> +{
>> + int rc, i;
>> + u32 base;
>> + unsigned int reg;
>> + const char *name;
>> + struct device *dev = &pdev->dev;
>> + struct regulator_config reg_config = {};
>> + struct regulator_dev *rdev;
>> + const struct pm8008_data *chip = dev_get_drvdata(pdev->dev.parent);
>> + struct pm8008_regulator *pm8008_reg;
>> +
>> + pm8008_reg = devm_kzalloc(dev, sizeof(*pm8008_reg), GFP_KERNEL);
>> + if (!pm8008_reg)
>> + return -ENOMEM;
>> +
>> + pm8008_reg->regmap = pm8008_get_regmap(chip);
>> + if (!pm8008_reg->regmap) {
>> + dev_err(dev, "parent regmap is missing\n");
>> + return -EINVAL;
>> + }
>> +
>> + pm8008_reg->dev = dev;
>> +
>> + rc = of_property_read_string(dev->of_node, "regulator-name", &name);
>> + if (rc)
>> + return rc;
>> +
>> + /* get the required regulator data */
>> + for (i = 0; i < ARRAY_SIZE(reg_data); i++)
>> + if (strstr(name, reg_data[i].name))
>> + break;
>> +
>> + if (i == ARRAY_SIZE(reg_data)) {
>> + dev_err(dev, "Invalid regulator name %s\n", name);
>> + return -EINVAL;
>> + }
>> +
>> + rc = of_property_read_u32_index(dev->of_node, "reg", 1, &base);
>> + if (rc < 0) {
>> + dev_err(dev, "%s: failed to get regulator base rc=%d\n", name, rc);
>> + return rc;
>> + }
>> + pm8008_reg->base = base;
>> +
>> + /* get slew rate */
>> + rc = regmap_bulk_read(pm8008_reg->regmap,
>> + LDO_STEPPER_CTL_REG(pm8008_reg->base), ®, 1);
>> + if (rc < 0) {
>> + dev_err(dev, "failed to read step rate configuration rc=%d\n", rc);
>> + return rc;
>> + }
>> + reg &= STEP_RATE_MASK;
>> + pm8008_reg->step_rate = DEFAULT_VOLTAGE_STEPPER_RATE >> reg;
>> +
>> + pm8008_reg->rdesc.type = REGULATOR_VOLTAGE;
>> + pm8008_reg->rdesc.ops = &pm8008_regulator_ops;
>> + pm8008_reg->rdesc.name = reg_data[i].name;
>> + pm8008_reg->rdesc.supply_name = reg_data[i].supply_name;
>> + pm8008_reg->rdesc.of_match = reg_data[i].name;
>> + pm8008_reg->rdesc.uV_step = VSET_STEP_UV;
>> + pm8008_reg->rdesc.linear_ranges = reg_data[i].voltage_range;
>> + pm8008_reg->rdesc.n_linear_ranges = 1;
>> +
> Ideally the static assert is right here.
If I place it here below error is seen
error: ISO C90 forbids mixing declarations and code
[-Werror,-Wdeclaration-after-statement]
It could be placed at the beginning of this function near the
declarations though. I see that many of the drivers add it below the
array itself.
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