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Message-ID: <ZAcrzYNesiTYLCH3@smile.fi.intel.com>
Date: Tue, 7 Mar 2023 14:19:25 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Okan Sahin <okan.sahin@...log.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Cosmin Tanislav <demonsingur@...il.com>,
Linus Walleij <linus.walleij@...aro.org>,
William Breathitt Gray <william.gray@...aro.org>,
Caleb Connolly <caleb.connolly@...aro.org>,
ChiYuan Huang <cy_huang@...htek.com>,
Ramona Bolboaca <ramona.bolboaca@...log.com>,
Ibrahim Tilki <Ibrahim.Tilki@...log.com>,
ChiaEn Wu <chiaen_wu@...htek.com>,
Arnd Bergmann <arnd@...db.de>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Hugo Villeneuve <hvilleneuve@...onoff.com>,
Haibo Chen <haibo.chen@....com>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH v6 2/5] regulator: max77541: Add ADI MAX77541/MAX77540
Regulator Support
On Tue, Mar 07, 2023 at 02:28:12PM +0300, Okan Sahin wrote:
> Regulator driver for both MAX77541 and MAX77540.
> The MAX77541 is a high-efficiency step-down converter
> with two 3A switching phases for single-cell Li+ battery
> and 5VDC systems.
>
> The MAX77540 is a high-efficiency step-down converter
> with two 3A switching phases.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
But see below.
> Signed-off-by: Okan Sahin <okan.sahin@...log.com>
> ---
> drivers/regulator/Kconfig | 9 ++
> drivers/regulator/Makefile | 1 +
> drivers/regulator/max77541-regulator.c | 153 +++++++++++++++++++++++++
> 3 files changed, 163 insertions(+)
> create mode 100644 drivers/regulator/max77541-regulator.c
>
> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
> index aae28d0a489c..f0418274c083 100644
> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -556,6 +556,15 @@ config REGULATOR_MAX597X
> The MAX5970/5978 is a smart switch with no output regulation, but
> fault protection and voltage and current monitoring capabilities.
>
> +config REGULATOR_MAX77541
> + tristate "Analog Devices MAX77541/77540 Regulator"
> + depends on MFD_MAX77541
> + help
> + This driver controls a Analog Devices MAX77541/77540 regulators
> + via I2C bus. Both MAX77540 and MAX77541 are dual-phase
> + high-efficiency buck converter. Say Y here to
> + enable the regulator driver.
Maybe adding what would be the module name if M is chosen?
> config REGULATOR_MAX77620
> tristate "Maxim 77620/MAX20024 voltage regulator"
> depends on MFD_MAX77620 || COMPILE_TEST
> diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
> index ee383d8fc835..1c852f3140a3 100644
> --- a/drivers/regulator/Makefile
> +++ b/drivers/regulator/Makefile
> @@ -68,6 +68,7 @@ obj-$(CONFIG_REGULATOR_LTC3676) += ltc3676.o
> obj-$(CONFIG_REGULATOR_MAX14577) += max14577-regulator.o
> obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
> obj-$(CONFIG_REGULATOR_MAX597X) += max597x-regulator.o
> +obj-$(CONFIG_REGULATOR_MAX77541) += max77541-regulator.o
> obj-$(CONFIG_REGULATOR_MAX77620) += max77620-regulator.o
> obj-$(CONFIG_REGULATOR_MAX77650) += max77650-regulator.o
> obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
> diff --git a/drivers/regulator/max77541-regulator.c b/drivers/regulator/max77541-regulator.c
> new file mode 100644
> index 000000000000..f99caf3f3990
> --- /dev/null
> +++ b/drivers/regulator/max77541-regulator.c
> @@ -0,0 +1,153 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2022 Analog Devices, Inc.
> + * ADI Regulator driver for the MAX77540 and MAX77541
> + */
I believe Mark asked to have this C++ comment style as well.
// Copyright (c) 2022 Analog Devices, Inc.
// ADI Regulator driver for the MAX77540 and MAX77541
> +#include <linux/mfd/max77541.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/driver.h>
> +
> +static const struct regulator_ops max77541_buck_ops = {
> + .enable = regulator_enable_regmap,
> + .disable = regulator_disable_regmap,
> + .is_enabled = regulator_is_enabled_regmap,
> + .list_voltage = regulator_list_voltage_pickable_linear_range,
> + .get_voltage_sel = regulator_get_voltage_sel_pickable_regmap,
> + .set_voltage_sel = regulator_set_voltage_sel_pickable_regmap,
> +};
> +
> +static const struct linear_range max77540_buck_ranges[] = {
> + /* Ranges when VOLT_SEL bits are 0x00 */
> + REGULATOR_LINEAR_RANGE(500000, 0x00, 0x8B, 5000),
> + REGULATOR_LINEAR_RANGE(1200000, 0x8C, 0xFF, 0),
> + /* Ranges when VOLT_SEL bits are 0x40 */
> + REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x8B, 10000),
> + REGULATOR_LINEAR_RANGE(2400000, 0x8C, 0xFF, 0),
> + /* Ranges when VOLT_SEL bits are 0x80 */
> + REGULATOR_LINEAR_RANGE(2000000, 0x00, 0x9F, 20000),
> + REGULATOR_LINEAR_RANGE(5200000, 0xA0, 0xFF, 0),
> +};
> +
> +static const struct linear_range max77541_buck_ranges[] = {
> + /* Ranges when VOLT_SEL bits are 0x00 */
> + REGULATOR_LINEAR_RANGE(300000, 0x00, 0xB3, 5000),
> + REGULATOR_LINEAR_RANGE(1200000, 0xB4, 0xFF, 0),
> + /* Ranges when VOLT_SEL bits are 0x40 */
> + REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x8B, 10000),
> + REGULATOR_LINEAR_RANGE(2400000, 0x8C, 0xFF, 0),
> + /* Ranges when VOLT_SEL bits are 0x80 */
> + REGULATOR_LINEAR_RANGE(2000000, 0x00, 0x9F, 20000),
> + REGULATOR_LINEAR_RANGE(5200000, 0xA0, 0xFF, 0),
> +};
> +
> +static const unsigned int max77541_buck_volt_range_sel[] = {
> + 0x00, 0x00, 0x40, 0x40, 0x80, 0x80,
> +};
> +
> +enum max77541_regulators {
> + MAX77541_BUCK1 = 1,
> + MAX77541_BUCK2,
> +};
> +
> +#define MAX77540_BUCK(_id, _ops) \
> + { .id = MAX77541_BUCK ## _id, \
> + .name = "buck"#_id, \
> + .of_match = "buck"#_id, \
> + .regulators_node = "regulators", \
> + .enable_reg = MAX77541_REG_EN_CTRL, \
> + .enable_mask = MAX77541_BIT_M ## _id ## _EN, \
> + .ops = &(_ops), \
> + .type = REGULATOR_VOLTAGE, \
> + .linear_ranges = max77540_buck_ranges, \
> + .n_linear_ranges = ARRAY_SIZE(max77540_buck_ranges), \
> + .vsel_reg = MAX77541_REG_M ## _id ## _VOUT, \
> + .vsel_mask = MAX77541_BITS_MX_VOUT, \
> + .vsel_range_reg = MAX77541_REG_M ## _id ## _CFG1, \
> + .vsel_range_mask = MAX77541_BITS_MX_CFG1_RNG, \
> + .linear_range_selectors = max77541_buck_volt_range_sel, \
> + .owner = THIS_MODULE, \
> + }
> +
> +#define MAX77541_BUCK(_id, _ops) \
> + { .id = MAX77541_BUCK ## _id, \
> + .name = "buck"#_id, \
> + .of_match = "buck"#_id, \
> + .regulators_node = "regulators", \
> + .enable_reg = MAX77541_REG_EN_CTRL, \
> + .enable_mask = MAX77541_BIT_M ## _id ## _EN, \
> + .ops = &(_ops), \
> + .type = REGULATOR_VOLTAGE, \
> + .linear_ranges = max77541_buck_ranges, \
> + .n_linear_ranges = ARRAY_SIZE(max77541_buck_ranges), \
> + .vsel_reg = MAX77541_REG_M ## _id ## _VOUT, \
> + .vsel_mask = MAX77541_BITS_MX_VOUT, \
> + .vsel_range_reg = MAX77541_REG_M ## _id ## _CFG1, \
> + .vsel_range_mask = MAX77541_BITS_MX_CFG1_RNG, \
> + .linear_range_selectors = max77541_buck_volt_range_sel, \
> + .owner = THIS_MODULE, \
> + }
> +
> +static const struct regulator_desc max77540_regulators_desc[] = {
> + MAX77540_BUCK(1, max77541_buck_ops),
> + MAX77540_BUCK(2, max77541_buck_ops),
> +};
> +
> +static const struct regulator_desc max77541_regulators_desc[] = {
> + MAX77541_BUCK(1, max77541_buck_ops),
> + MAX77541_BUCK(2, max77541_buck_ops),
> +};
> +
> +static int max77541_regulator_probe(struct platform_device *pdev)
> +{
> + struct regulator_config config = {};
> + const struct regulator_desc *desc;
> + struct device *dev = &pdev->dev;
> + struct regulator_dev *rdev;
> + struct max77541 *max77541 = dev_get_drvdata(dev->parent);
> + unsigned int i;
> +
> + config.dev = dev->parent;
> +
> + switch (max77541->chip->id) {
> + case MAX77540:
> + desc = max77540_regulators_desc;
> + break;
> + case MAX77541:
> + desc = max77541_regulators_desc;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + for (i = 0; i < MAX77541_MAX_REGULATORS; i++) {
> + rdev = devm_regulator_register(dev, &desc[i], &config);
> + if (IS_ERR(rdev))
> + return dev_err_probe(dev, PTR_ERR(rdev),
> + "Failed to register regulator\n");
> + }
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id max77541_regulator_platform_id[] = {
> + { "max77540-regulator" },
> + { "max77541-regulator" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(platform, max77541_regulator_platform_id);
> +
> +static struct platform_driver max77541_regulator_driver = {
> + .driver = {
> + .name = "max77541-regulator",
> + },
> + .probe = max77541_regulator_probe,
> + .id_table = max77541_regulator_platform_id,
> +};
> +module_platform_driver(max77541_regulator_driver);
> +
> +MODULE_AUTHOR("Okan Sahin <Okan.Sahin@...log.com>");
> +MODULE_DESCRIPTION("MAX77540/MAX77541 regulator driver");
> +MODULE_LICENSE("GPL");
> --
> 2.30.2
>
--
With Best Regards,
Andy Shevchenko
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