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[PATCH v4 15/27] regulator: add s2dos05 regulator support

Dzmitry Sankouski posted 27 patches 2 months, 2 weeks ago
There is a newer version of this series
[PATCH v4 15/27] regulator: add s2dos05 regulator support
Posted by Dzmitry Sankouski 2 months, 2 weeks ago 
S2dos05 has 1 buck and 4 LDO regulators, used for powering
panel/touchscreen.

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>

---
Changes in v4:
- remove excessive linux/module.h import
- use generic regulator helpers
- use of_match
- use devm_* for mem allocations
- use // style comment
- drop all junk Samsung code
- adjust to depend on sec-core
---
 MAINTAINERS                           |   1 +
 drivers/regulator/Kconfig             |   8 ++
 drivers/regulator/Makefile            |   1 +
 drivers/regulator/s2dos05-regulator.c | 176 ++++++++++++++++++++++++++++++++++
 include/linux/regulator/s2dos05.h     |  73 ++++++++++++++
 5 files changed, 259 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 444cc855a01e..25dcce07180a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20476,6 +20476,7 @@ F:	Documentation/devicetree/bindings/regulator/samsung,s2m*.yaml
 F:	Documentation/devicetree/bindings/regulator/samsung,s5m*.yaml
 F:	drivers/clk/clk-s2mps11.c
 F:	drivers/mfd/sec*.c
+F:	drivers/regulator/s2dos*.c
 F:	drivers/regulator/s2m*.c
 F:	drivers/regulator/s5m*.c
 F:	drivers/rtc/rtc-s5m.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 4b411a09c1a6..63085d73cf74 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1322,6 +1322,14 @@ config REGULATOR_RTQ2208
 	  and two ldos. It features wide output voltage range from 0.4V to 2.05V
 	  and the capability to configure the corresponding power stages.
 
+config REGULATOR_S2DOS05
+	tristate "SLSI S2DOS05 regulator"
+	depends on MFD_SEC_CORE || COMPILE_TEST
+	help
+	  This driver provides support for the voltage regulators of the S2DOS05.
+	  The S2DOS05 is a companion power management IC for the smart phones.
+	  The S2DOS05 has 4 LDOs and 1 BUCK outputs.
+
 config REGULATOR_S2MPA01
 	tristate "Samsung S2MPA01 voltage regulator"
 	depends on MFD_SEC_CORE || COMPILE_TEST
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index a61fa42b13c4..d26e0db7c825 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -154,6 +154,7 @@ obj-$(CONFIG_REGULATOR_RTMV20)	+= rtmv20-regulator.o
 obj-$(CONFIG_REGULATOR_RTQ2134) += rtq2134-regulator.o
 obj-$(CONFIG_REGULATOR_RTQ6752)	+= rtq6752-regulator.o
 obj-$(CONFIG_REGULATOR_RTQ2208) += rtq2208-regulator.o
+obj-$(CONFIG_REGULATOR_S2DOS05) += s2dos05-regulator.o
 obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
diff --git a/drivers/regulator/s2dos05-regulator.c b/drivers/regulator/s2dos05-regulator.c
new file mode 100644
index 000000000000..1325c8311b08
--- /dev/null
+++ b/drivers/regulator/s2dos05-regulator.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// s2dos05.c - Regulator driver for the Samsung s2dos05
+//
+// Copyright (C) 2024 Dzmitry Sankouski <dsankouski@gmail.com>
+
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/samsung/core.h>
+#include <linux/regulator/s2dos05.h>
+#include <linux/i2c.h>
+
+struct s2dos05_data {
+	struct regmap *regmap;
+	struct device *dev;
+};
+
+static const struct regulator_ops s2dos05_ops = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.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,
+	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
+	.set_active_discharge	= regulator_set_active_discharge_regmap,
+};
+
+#define _BUCK(macro)	S2DOS05_BUCK##macro
+#define _buck_ops(num)	s2dos05_ops##num
+
+#define _LDO(macro)	S2DOS05_LDO##macro
+#define _REG(ctrl)	S2DOS05_REG##ctrl
+#define _ldo_ops(num)	s2dos05_ops##num
+#define _MASK(macro)	S2DOS05_ENABLE_MASK##macro
+#define _TIME(macro)	S2DOS05_ENABLE_TIME##macro
+
+#define BUCK_DESC(_name, _id, _ops, m, s, v, e, em, t, a) {	\
+	.name		= _name,				\
+	.id		= _id,					\
+	.ops		= _ops,					\
+	.of_match = of_match_ptr(_name),	\
+	.regulators_node = of_match_ptr("regulators"),	\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= m,					\
+	.uV_step	= s,					\
+	.n_voltages	= S2DOS05_BUCK_N_VOLTAGES,		\
+	.vsel_reg	= v,					\
+	.vsel_mask	= S2DOS05_BUCK_VSEL_MASK,		\
+	.enable_reg	= e,					\
+	.enable_mask	= em,					\
+	.enable_time	= t,					\
+	.active_discharge_off = 0,				\
+	.active_discharge_on = S2DOS05_BUCK_FD_MASK,		\
+	.active_discharge_reg	= a,				\
+	.active_discharge_mask	= S2DOS05_BUCK_FD_MASK		\
+}
+
+#define LDO_DESC(_name, _id, _ops, m, s, v, e, em, t, a) {	\
+	.name		= _name,				\
+	.id		= _id,					\
+	.ops		= _ops,					\
+	.of_match = of_match_ptr(_name),	\
+	.regulators_node = of_match_ptr("regulators"),	\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= m,					\
+	.uV_step	= s,					\
+	.n_voltages	= S2DOS05_LDO_N_VOLTAGES,		\
+	.vsel_reg	= v,					\
+	.vsel_mask	= S2DOS05_LDO_VSEL_MASK,		\
+	.enable_reg	= e,					\
+	.enable_mask	= em,					\
+	.enable_time	= t,					\
+	.active_discharge_off = 0,				\
+	.active_discharge_on = S2DOS05_LDO_FD_MASK,		\
+	.active_discharge_reg	= a,				\
+	.active_discharge_mask	= S2DOS05_LDO_FD_MASK		\
+}
+
+static struct regulator_desc regulators[S2DOS05_REGULATOR_MAX] = {
+		// name, id, ops, min_uv, uV_step, vsel_reg, enable_reg
+		LDO_DESC("ldo1", _LDO(1), &_ldo_ops(), _LDO(_MIN1),
+			_LDO(_STEP1), _REG(_LDO1_CFG),
+			_REG(_EN), _MASK(_L1), _TIME(_LDO), _REG(_LDO1_CFG)),
+		LDO_DESC("ldo2", _LDO(2), &_ldo_ops(), _LDO(_MIN1),
+			_LDO(_STEP1), _REG(_LDO2_CFG),
+			_REG(_EN), _MASK(_L2), _TIME(_LDO), _REG(_LDO2_CFG)),
+		LDO_DESC("ldo3", _LDO(3), &_ldo_ops(), _LDO(_MIN2),
+			_LDO(_STEP1), _REG(_LDO3_CFG),
+			_REG(_EN), _MASK(_L3), _TIME(_LDO), _REG(_LDO3_CFG)),
+		LDO_DESC("ldo4", _LDO(4), &_ldo_ops(), _LDO(_MIN2),
+			_LDO(_STEP1), _REG(_LDO4_CFG),
+			_REG(_EN), _MASK(_L4), _TIME(_LDO), _REG(_LDO4_CFG)),
+		BUCK_DESC("buck1", _BUCK(1), &_buck_ops(), _BUCK(_MIN1),
+			_BUCK(_STEP1), _REG(_BUCK_VOUT),
+			_REG(_EN), _MASK(_B1), _TIME(_BUCK), _REG(_BUCK_CFG)),
+};
+
+static int s2dos05_pmic_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct of_regulator_match *rdata = NULL;
+	struct s2dos05_data *s2dos05;
+	struct regulator_config config = { };
+	unsigned int rdev_num = ARRAY_SIZE(regulators);
+	int i, ret;
+
+	s2dos05 = devm_kzalloc(dev, sizeof(struct s2dos05_data),
+				GFP_KERNEL);
+	if (!s2dos05)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, s2dos05);
+
+	rdata = devm_kcalloc(dev, rdev_num, sizeof(*rdata), GFP_KERNEL);
+	if (!rdata)
+		return -ENOMEM;
+
+	for (i = 0; i < rdev_num; i++)
+		rdata[i].name = regulators[i].name;
+
+	s2dos05->regmap = iodev->regmap_pmic;
+	s2dos05->dev = dev;
+	if (!dev->of_node)
+		dev->of_node = dev->parent->of_node;
+
+	for (i = 0; i < rdev_num; i++) {
+		struct regulator_dev *regulator;
+
+		config.init_data = rdata[i].init_data;
+		config.of_node = rdata[i].of_node;
+		config.dev = dev;
+		config.driver_data = s2dos05;
+		regulator = devm_regulator_register(&pdev->dev,
+						&regulators[i], &config);
+		if (IS_ERR(regulator)) {
+			ret = PTR_ERR(regulator);
+			dev_err(&pdev->dev, "regulator init failed for %d\n",
+				i);
+		}
+	}
+
+	return ret;
+}
+
+static const struct platform_device_id s2dos05_pmic_id[] = {
+	{ "s2dos05-regulator" },
+	{ },
+};
+MODULE_DEVICE_TABLE(platform, s2dos05_pmic_id);
+
+static struct platform_driver s2dos05_platform_driver = {
+	.driver = {
+		.name = "s2dos05",
+	},
+	.probe = s2dos05_pmic_probe,
+	.id_table = s2dos05_pmic_id,
+};
+module_platform_driver(s2dos05_platform_driver);
+
+MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@gmail.com>");
+MODULE_DESCRIPTION("SAMSUNG s2dos05 Regulator Driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/s2dos05.h b/include/linux/regulator/s2dos05.h
new file mode 100644
index 000000000000..2e89fcbce769
--- /dev/null
+++ b/include/linux/regulator/s2dos05.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+// s2dos05.h
+//
+// Copyright (c) 2016 Samsung Electronics Co., Ltd
+//              http://www.samsung.com
+// Copyright (C) 2024 Dzmitry Sankouski <dsankouski@gmail.com>
+
+#ifndef __LINUX_S2DOS05_H
+#define __LINUX_S2DOS05_H
+
+// S2DOS05 registers
+// Slave Addr : 0xC0
+enum S2DOS05_reg {
+	S2DOS05_REG_DEV_ID,
+	S2DOS05_REG_TOPSYS_STAT,
+	S2DOS05_REG_STAT,
+	S2DOS05_REG_EN,
+	S2DOS05_REG_LDO1_CFG,
+	S2DOS05_REG_LDO2_CFG,
+	S2DOS05_REG_LDO3_CFG,
+	S2DOS05_REG_LDO4_CFG,
+	S2DOS05_REG_BUCK_CFG,
+	S2DOS05_REG_BUCK_VOUT,
+	S2DOS05_REG_IRQ_MASK = 0x0D,
+	S2DOS05_REG_SSD_TSD = 0x0E,
+	S2DOS05_REG_OCL = 0x10,
+	S2DOS05_REG_IRQ = 0x11
+};
+
+// S2DOS05 regulator ids
+enum S2DOS05_regulators {
+	S2DOS05_LDO1,
+	S2DOS05_LDO2,
+	S2DOS05_LDO3,
+	S2DOS05_LDO4,
+	S2DOS05_BUCK1,
+	S2DOS05_REG_MAX,
+};
+
+#define S2DOS05_IRQ_PWRMT_MASK	BIT(5)
+#define S2DOS05_IRQ_TSD_MASK	BIT(4)
+#define S2DOS05_IRQ_SSD_MASK	BIT(3)
+#define S2DOS05_IRQ_SCP_MASK	BIT(2)
+#define S2DOS05_IRQ_UVLO_MASK	BIT(1)
+#define S2DOS05_IRQ_OCD_MASK	BIT(0)
+
+#define S2DOS05_BUCK_MIN1	506250
+#define S2DOS05_LDO_MIN1	1500000
+#define S2DOS05_LDO_MIN2	2700000
+#define S2DOS05_BUCK_STEP1	6250
+#define S2DOS05_LDO_STEP1	25000
+#define S2DOS05_LDO_VSEL_MASK	0x7F
+#define S2DOS05_LDO_FD_MASK	0x80
+#define S2DOS05_BUCK_VSEL_MASK	0xFF
+#define S2DOS05_BUCK_FD_MASK	0x08
+
+#define S2DOS05_ENABLE_MASK_L1	BIT(0)
+#define S2DOS05_ENABLE_MASK_L2	BIT(1)
+#define S2DOS05_ENABLE_MASK_L3	BIT(2)
+#define S2DOS05_ENABLE_MASK_L4	BIT(3)
+#define S2DOS05_ENABLE_MASK_B1	BIT(4)
+
+#define S2DOS05_RAMP_DELAY	12000
+
+#define S2DOS05_ENABLE_TIME_LDO		50
+#define S2DOS05_ENABLE_TIME_BUCK	350
+
+#define S2DOS05_LDO_N_VOLTAGES	(S2DOS05_LDO_VSEL_MASK + 1)
+#define S2DOS05_BUCK_N_VOLTAGES (S2DOS05_BUCK_VSEL_MASK + 1)
+
+#define S2DOS05_REGULATOR_MAX	(S2DOS05_REG_MAX)
+
+#endif // __LINUX_S2DOS05_H

-- 
2.39.2
Re: [PATCH v4 15/27] regulator: add s2dos05 regulator support
Posted by Krzysztof Kozlowski 2 months, 2 weeks ago 
On Fri, Sep 13, 2024 at 06:07:58PM +0300, Dzmitry Sankouski wrote:
> S2dos05 has 1 buck and 4 LDO regulators, used for powering
> panel/touchscreen.
> 
> Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
> 

...

> +#include <linux/bug.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/machine.h>
> +#include <linux/regulator/of_regulator.h>
> +#include <linux/mfd/samsung/core.h>
> +#include <linux/regulator/s2dos05.h>
> +#include <linux/i2c.h>
> +
> +struct s2dos05_data {
> +	struct regmap *regmap;
> +	struct device *dev;
> +};
> +
> +static const struct regulator_ops s2dos05_ops = {

Keep definitions together. This goes down, after all declarations and
macros.

> +	.list_voltage		= regulator_list_voltage_linear,
> +	.map_voltage		= regulator_map_voltage_linear,
> +	.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,
> +	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
> +	.set_active_discharge	= regulator_set_active_discharge_regmap,
> +};
> +
> +#define _BUCK(macro)	S2DOS05_BUCK##macro
> +#define _buck_ops(num)	s2dos05_ops##num
> +
> +#define _LDO(macro)	S2DOS05_LDO##macro
> +#define _REG(ctrl)	S2DOS05_REG##ctrl
> +#define _ldo_ops(num)	s2dos05_ops##num
> +#define _MASK(macro)	S2DOS05_ENABLE_MASK##macro
> +#define _TIME(macro)	S2DOS05_ENABLE_TIME##macro
> +

...

> +
> +static struct regulator_desc regulators[S2DOS05_REGULATOR_MAX] = {

This should be const.

> +		// name, id, ops, min_uv, uV_step, vsel_reg, enable_reg
> +		LDO_DESC("ldo1", _LDO(1), &_ldo_ops(), _LDO(_MIN1),
> +			_LDO(_STEP1), _REG(_LDO1_CFG),
> +			_REG(_EN), _MASK(_L1), _TIME(_LDO), _REG(_LDO1_CFG)),
> +		LDO_DESC("ldo2", _LDO(2), &_ldo_ops(), _LDO(_MIN1),
> +			_LDO(_STEP1), _REG(_LDO2_CFG),
> +			_REG(_EN), _MASK(_L2), _TIME(_LDO), _REG(_LDO2_CFG)),
> +		LDO_DESC("ldo3", _LDO(3), &_ldo_ops(), _LDO(_MIN2),
> +			_LDO(_STEP1), _REG(_LDO3_CFG),
> +			_REG(_EN), _MASK(_L3), _TIME(_LDO), _REG(_LDO3_CFG)),
> +		LDO_DESC("ldo4", _LDO(4), &_ldo_ops(), _LDO(_MIN2),
> +			_LDO(_STEP1), _REG(_LDO4_CFG),
> +			_REG(_EN), _MASK(_L4), _TIME(_LDO), _REG(_LDO4_CFG)),
> +		BUCK_DESC("buck1", _BUCK(1), &_buck_ops(), _BUCK(_MIN1),
> +			_BUCK(_STEP1), _REG(_BUCK_VOUT),
> +			_REG(_EN), _MASK(_B1), _TIME(_BUCK), _REG(_BUCK_CFG)),
> +};
> +
> +static int s2dos05_pmic_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> +	struct of_regulator_match *rdata = NULL;
> +	struct s2dos05_data *s2dos05;
> +	struct regulator_config config = { };
> +	unsigned int rdev_num = ARRAY_SIZE(regulators);
> +	int i, ret;
> +
> +	s2dos05 = devm_kzalloc(dev, sizeof(struct s2dos05_data),
> +				GFP_KERNEL);

sizeof(*)

> +	if (!s2dos05)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, s2dos05);
> +
> +	rdata = devm_kcalloc(dev, rdev_num, sizeof(*rdata), GFP_KERNEL);
> +	if (!rdata)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < rdev_num; i++)
> +		rdata[i].name = regulators[i].name;
> +
> +	s2dos05->regmap = iodev->regmap_pmic;
> +	s2dos05->dev = dev;
> +	if (!dev->of_node)
> +		dev->of_node = dev->parent->of_node;
> +
> +	for (i = 0; i < rdev_num; i++) {
> +		struct regulator_dev *regulator;
> +
> +		config.init_data = rdata[i].init_data;
> +		config.of_node = rdata[i].of_node;
> +		config.dev = dev;
> +		config.driver_data = s2dos05;
> +		regulator = devm_regulator_register(&pdev->dev,
> +						&regulators[i], &config);
> +		if (IS_ERR(regulator)) {
> +			ret = PTR_ERR(regulator);
> +			dev_err(&pdev->dev, "regulator init failed for %d\n",
> +				i);
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct platform_device_id s2dos05_pmic_id[] = {
> +	{ "s2dos05-regulator" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(platform, s2dos05_pmic_id);
> +
> +static struct platform_driver s2dos05_platform_driver = {
> +	.driver = {
> +		.name = "s2dos05",
> +	},
> +	.probe = s2dos05_pmic_probe,
> +	.id_table = s2dos05_pmic_id,
> +};
> +module_platform_driver(s2dos05_platform_driver);
> +
> +MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@gmail.com>");
> +MODULE_DESCRIPTION("SAMSUNG s2dos05 Regulator Driver");

s/SAMSUNG/Samsung/

Also, your Kconfig used different name, so please use one - probably
Samsung.

This applies to MFD patch as well.

> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/regulator/s2dos05.h b/include/linux/regulator/s2dos05.h
> new file mode 100644
> index 000000000000..2e89fcbce769
> --- /dev/null
> +++ b/include/linux/regulator/s2dos05.h
> @@ -0,0 +1,73 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */

Are you sure that here (and other places) you want any newer GPL? This
is quite odd. Does original code (from which you took 2016 copyrights)
have this as well?

Best regards,
Krzysztof
Re: [PATCH v4 15/27] regulator: add s2dos05 regulator support
Posted by Dzmitry Sankouski 2 months, 1 week ago 
> > diff --git a/include/linux/regulator/s2dos05.h b/include/linux/regulator/s2dos05.h
> > new file mode 100644
> > index 000000000000..2e89fcbce769
> > --- /dev/null
> > +++ b/include/linux/regulator/s2dos05.h
> > @@ -0,0 +1,73 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
>
> Are you sure that here (and other places) you want any newer GPL? This
> is quite odd. Does original code (from which you took 2016 copyrights)
> have this as well?
>
Original code permits redistribution under 2+ license [1].
Is 2+ preferable over 2 only?

[1]: https://github.com/klabit87/twrp_android_samsung_kernel_sdm845/blob/android-8.0/include/linux/regulator/s2dos05.h#L9
Re: [PATCH v4 15/27] regulator: add s2dos05 regulator support
Posted by Krzysztof Kozlowski 2 months, 1 week ago 
On 19/09/2024 16:28, Dzmitry Sankouski wrote:
>>> diff --git a/include/linux/regulator/s2dos05.h b/include/linux/regulator/s2dos05.h
>>> new file mode 100644
>>> index 000000000000..2e89fcbce769
>>> --- /dev/null
>>> +++ b/include/linux/regulator/s2dos05.h
>>> @@ -0,0 +1,73 @@
>>> +/* SPDX-License-Identifier: GPL-2.0+ */
>>
>> Are you sure that here (and other places) you want any newer GPL? This
>> is quite odd. Does original code (from which you took 2016 copyrights)
>> have this as well?
>>
> Original code permits redistribution under 2+ license [1].
> Is 2+ preferable over 2 only?
> 
> [1]: https://github.com/klabit87/twrp_android_samsung_kernel_sdm845/blob/android-8.0/include/linux/regulator/s2dos05.h#L9

For new code we usually suggest 2-only, but your work looks like
derivative, so keeping 2+ is fine.

Best regards,
Krzysztof

Patchew 2.1-devel-b67e4c2

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