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Date: Mon, 22 May 2017 09:58:04 +0530
From: Keerthy <j-keerthy@...com>
To: "Andrew F. Davis" <afd@...com>, <broonie@...nel.org>,
<lee.jones@...aro.org>, <robh+dt@...nel.org>
CC: <t-kristo@...com>, <tony@...mide.com>, <mark.rutland@....com>,
<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/3] regulator: lp87565: Add support for lp87565 PMIC
regulators
On Friday 19 May 2017 09:23 PM, Andrew F. Davis wrote:
> On 05/19/2017 07:42 AM, Keerthy wrote:
>> The regulators set consists of 4 BUCKs. The output
>> voltages are configurable and are meant to supply power to the
>> main processor and other components. The ramp delay is configurable
>> for all BUCKs. The BUCKs can be configured in single phase or
>> multiphase modes.
>>
>> Signed-off-by: Keerthy <j-keerthy@...com>
>> ---
>> drivers/regulator/Kconfig | 8 ++
>> drivers/regulator/Makefile | 1 +
>> drivers/regulator/lp87565-regulator.c | 244 ++++++++++++++++++++++++++++++++++
>> 3 files changed, 253 insertions(+)
>> create mode 100644 drivers/regulator/lp87565-regulator.c
>>
>> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
>> index 48db87d..7c34ff8 100644
>> --- a/drivers/regulator/Kconfig
>> +++ b/drivers/regulator/Kconfig
>> @@ -365,6 +365,14 @@ config REGULATOR_LP8755
>> chip contains six step-down DC/DC converters which can support
>> 9 mode multiphase configuration.
>>
>> +config REGULATOR_LP87565
>> + tristate "TI LP87565 Power regulators"
>> + depends on MFD_TI_LP87565 && OF
>> + help
>> + This driver supports LP87565 voltage regulator chips. LP87565
>> + provides four step-down converters. It supports software based
>> + voltage control for different voltage domains
>> +
>> config REGULATOR_LP8788
>> tristate "TI LP8788 Power Regulators"
>> depends on MFD_LP8788
>> diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
>> index dc3503f..fee6b8c 100644
>> --- a/drivers/regulator/Makefile
>> +++ b/drivers/regulator/Makefile
>> @@ -46,6 +46,7 @@ obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
>> obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
>> obj-$(CONFIG_REGULATOR_LP872X) += lp872x.o
>> obj-$(CONFIG_REGULATOR_LP873X) += lp873x-regulator.o
>> +obj-$(CONFIG_REGULATOR_LP87565) += lp87565-regulator.o
>> obj-$(CONFIG_REGULATOR_LP8788) += lp8788-buck.o
>> obj-$(CONFIG_REGULATOR_LP8788) += lp8788-ldo.o
>> obj-$(CONFIG_REGULATOR_LP8755) += lp8755.o
>> diff --git a/drivers/regulator/lp87565-regulator.c b/drivers/regulator/lp87565-regulator.c
>> new file mode 100644
>> index 0000000..5849cf3
>> --- /dev/null
>> +++ b/drivers/regulator/lp87565-regulator.c
>> @@ -0,0 +1,244 @@
>> +/*
>> + * Regulator driver for LP87565 PMIC
>> + *
>> + * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>> + * kind, whether expressed or implied; without even the implied warranty
>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License version 2 for more details.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +
>> +#include <linux/mfd/lp87565.h>
>> +
>> +#define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
>> + _delay, _lr, _cr) \
>> + [_id] = { \
>> + .desc = { \
>> + .name = _name, \
>> + .supply_name = _of "-in", \
>> + .id = _id, \
>> + .of_match = of_match_ptr(_of), \
>> + .regulators_node = of_match_ptr("regulators"),\
>> + .ops = &_ops, \
>> + .n_voltages = _n, \
>> + .type = REGULATOR_VOLTAGE, \
>> + .owner = THIS_MODULE, \
>> + .vsel_reg = _vr, \
>> + .vsel_mask = _vm, \
>> + .enable_reg = _er, \
>> + .enable_mask = _em, \
>> + .ramp_delay = _delay, \
>> + .linear_ranges = _lr, \
>> + .n_linear_ranges = ARRAY_SIZE(_lr), \
>> + }, \
>> + .ctrl2_reg = _cr, \
>> + }
>> +
>> +#define LP87565_Q1_MIN_IDX LP87565_BUCK_10
>
> Unused?
Yes! Thanks for catching it.
>
>> +
>> +struct lp87565_regulator {
>> + struct regulator_desc desc;
>> + unsigned int ctrl2_reg;
>> +};
>> +
>> +static const struct lp87565_regulator regulators[];
>> +
>> +static const struct regulator_linear_range buck0_1_2_3_ranges[] = {
>> + REGULATOR_LINEAR_RANGE(500000, 0x0, 0x17, 10000),
>> + REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
>> + REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
>> +};
>> +
>> +static unsigned int lp87565_buck_ramp_delay[] = {
>> + 30000, 15000, 10000, 7500, 3800, 1900, 940, 470
>> +};
>> +
>> +/* LP87565 BUCK current limit */
>> +static const unsigned int lp87565_buck_uA[] = {
>> + 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
>> +};
>> +
>> +static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
>> + int ramp_delay)
>> +{
>> + int id = rdev_get_id(rdev);
>> + struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
>> + unsigned int reg;
>> + int ret;
>> +
>> + if (ramp_delay <= 470)
>> + reg = 7;
>> + else if (ramp_delay <= 940)
>> + reg = 6;
>> + else if (ramp_delay <= 1900)
>> + reg = 5;
>> + else if (ramp_delay <= 3800)
>> + reg = 4;
>> + else if (ramp_delay <= 7500)
>> + reg = 3;
>> + else if (ramp_delay <= 10000)
>> + reg = 2;
>> + else if (ramp_delay <= 15000)
>> + reg = 1;
>> + else
>> + reg = 0;
>> +
>> + ret = regmap_update_bits(lp87565->regmap, regulators[id].ctrl2_reg,
>> + LP87565_BUCK_CTRL_2_SLEW_RATE,
>> + reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
>> + if (ret) {
>> + dev_err(lp87565->dev, "SLEW RATE write failed: %d\n", ret);
>> + return ret;
>> + }
>> +
>> + rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
>> +
>> + return 0;
>> +}
>> +
>> +static int lp87565_buck_set_current_limit(struct regulator_dev *rdev,
>> + int min_uA, int max_uA)
>> +{
>> + int id = rdev_get_id(rdev);
>> + struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
>> + int i;
>> +
>> + for (i = ARRAY_SIZE(lp87565_buck_uA) - 1; i >= 0; i--) {
>> + if (lp87565_buck_uA[i] >= min_uA &&
>> + lp87565_buck_uA[i] <= max_uA)
>> + return regmap_update_bits(lp87565->regmap,
>> + regulators[id].ctrl2_reg,
>> + LP87565_BUCK_CTRL_2_ILIM,
>> + i << __ffs(LP87565_BUCK_CTRL_2_ILIM));
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +static int lp87565_buck_get_current_limit(struct regulator_dev *rdev)
>> +{
>> + int id = rdev_get_id(rdev);
>> + struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
>> + int ret;
>> + unsigned int val;
>> +
>> + ret = regmap_read(lp87565->regmap, regulators[id].ctrl2_reg, &val);
>> + if (ret)
>> + return ret;
>> +
>> + val = (val & LP87565_BUCK_CTRL_2_ILIM) >>
>> + __ffs(LP87565_BUCK_CTRL_2_ILIM);
>> +
>> + return (val < ARRAY_SIZE(lp87565_buck_uA)) ?
>> + lp87565_buck_uA[val] : -EINVAL;
>> +}
>> +
>> +/* Operations permitted on BUCK0, BUCK1 */
>> +static struct regulator_ops lp87565_buck_ops = {
>> + .is_enabled = regulator_is_enabled_regmap,
>> + .enable = regulator_enable_regmap,
>> + .disable = regulator_disable_regmap,
>> + .get_voltage_sel = regulator_get_voltage_sel_regmap,
>> + .set_voltage_sel = regulator_set_voltage_sel_regmap,
>> + .list_voltage = regulator_list_voltage_linear_range,
>> + .map_voltage = regulator_map_voltage_linear_range,
>> + .set_voltage_time_sel = regulator_set_voltage_time_sel,
>> + .set_ramp_delay = lp87565_buck_set_ramp_delay,
>> + .set_current_limit = lp87565_buck_set_current_limit,
>> + .get_current_limit = lp87565_buck_get_current_limit,
>> +};
>> +
>> +static const struct lp87565_regulator regulators[] = {
>> + LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
>> + 256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
>> + LP87565_REG_BUCK0_CTRL_1,
>> + LP87565_BUCK_CTRL_1_EN, 3800,
>> + buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
>> + LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
>> + 256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
>> + LP87565_REG_BUCK1_CTRL_1,
>> + LP87565_BUCK_CTRL_1_EN, 3800,
>> + buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
>> + LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
>> + 256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
>> + LP87565_REG_BUCK2_CTRL_1,
>> + LP87565_BUCK_CTRL_1_EN, 3800,
>> + buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
>> + LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
>> + 256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
>> + LP87565_REG_BUCK3_CTRL_1,
>> + LP87565_BUCK_CTRL_1_EN, 3800,
>> + buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
>> + LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
>> + 256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
>> + LP87565_REG_BUCK0_CTRL_1,
>> + LP87565_BUCK_CTRL_1_EN, 3800,
>> + buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
>> + LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
>> + 256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
>> + LP87565_REG_BUCK2_CTRL_1,
>> + LP87565_BUCK_CTRL_1_EN, 3800,
>> + buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
>> +};
>> +
>> +static int lp87565_regulator_probe(struct platform_device *pdev)
>> +{
>> + struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
>> + struct regulator_config config = { };
>> + struct regulator_dev *rdev;
>> + int i, min_idx = LP87565_BUCK_1, max_idx = LP87565_BUCK_3;
>> +
>> + platform_set_drvdata(pdev, lp87565);
>> +
>> + config.dev = &pdev->dev;
>> + config.dev->of_node = lp87565->dev->of_node;
>> + config.driver_data = lp87565;
>> + config.regmap = lp87565->regmap;
>> +
>> + if (lp87565->dev_type == LP87565_DEVICE_TYPE_LP87565_Q1) {
>> + min_idx = LP87565_BUCK_10;
>> + max_idx = LP87565_BUCK_23;
>> + }
>> +
>> + for (i = min_idx; i <= max_idx; i++) {
>> + rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc,
>> + &config);
>> + if (IS_ERR(rdev)) {
>> + dev_err(lp87565->dev, "failed to register %s regulator\n",
>> + pdev->name);
>> + return PTR_ERR(rdev);
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const struct platform_device_id lp87565_regulator_id_table[] = {
>> + { "lp87565-regulator", },
>> + { "lp87565-q1-regulator", },
>> + { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
>> +
>> +static struct platform_driver lp87565_regulator_driver = {
>> + .driver = {
>> + .name = "lp87565-pmic",
>> + },
>> + .probe = lp87565_regulator_probe,
>> + .id_table = lp87565_regulator_id_table,
>> +};
>> +module_platform_driver(lp87565_regulator_driver);
>> +
>> +MODULE_AUTHOR("J Keerthy <j-keerthy@...com>");
>> +MODULE_DESCRIPTION("LP87565 voltage regulator driver");
>> +MODULE_ALIAS("platform:lp87565-pmic");
>
> Is this needed? This name is not used, and the above MODULE_DEVICE_TABLE
> should take care of the needed aliases.
Yes. This can be removed.
I will do the changes and send a v2.
>
>> +MODULE_LICENSE("GPL v2");
>>
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