[PATCH 2/2] regulator: Add NXP PF8X00 regulator driver

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Add NXP PF8100/PF8121A/PF8200 regulator driver.

PF8100/PF8121A/PF8200 is PMIC designed for highperformance
consumer applications. It features seven high efficiency buck,
four linear and one vsnvs regulators.

Tested in Engicam i.Core MX8M Mini SOM platform boards.

Signed-off-by: Troy Kisky <troy.kisky@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
---
Note: driver referenced from nxp sources, so I kept the initial 
author and licence as it is. any comments on this regard would
appreciated?

 MAINTAINERS                          |   6 +
 drivers/regulator/Kconfig            |   8 +
 drivers/regulator/Makefile           |   1 +
 drivers/regulator/pf8x00-regulator.c | 496 +++++++++++++++++++++++++++
 4 files changed, 511 insertions(+)
 create mode 100644 drivers/regulator/pf8x00-regulator.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 6d24bd30b99e..e9d79df57278 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12672,6 +12672,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/display/imx/nxp,imx8mq-dcss.yaml
 F:	drivers/gpu/drm/imx/dcss/
 
+NXP PF8100/PF8121A/PF8200 PMIC REGULATOR DEVICE DRIVER
+M:	Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
+S:	Maintained
+F:	Documentation/devicetree/bindings/regulator/nxp,pf8x00-regulator.yaml
+F:	drivers/regulator/pf8x00-regulator.c
+
 NXP PTN5150A CC LOGIC AND EXTCON DRIVER
 M:	Krzysztof Kozlowski <krzk@xxxxxxxxxx>
 L:	linux-kernel@xxxxxxxxxxxxxxx
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index ca908bd6999b..88b27c25c476 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -812,6 +812,14 @@ config REGULATOR_PCF50633
 	 Say Y here to support the voltage regulators and converters
 	 on PCF50633
 
+config REGULATOR_PF8X00
+	tristate "NXP PF8100/PF8121A/PF8200 regulator driver"
+	depends on I2C && OF
+	select REGMAP_I2C
+	help
+	  Say y here to support the regulators found on the NXP
+	  PF8100/PF8121A/PF8200 PMIC.
+
 config REGULATOR_PFUZE100
 	tristate "Freescale PFUZE100/200/3000/3001 regulator driver"
 	depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 4e5a06f82de6..680e539f6579 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -102,6 +102,7 @@ obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o
 obj-$(CONFIG_REGULATOR_QCOM_USB_VBUS) += qcom_usb_vbus-regulator.o
 obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
 obj-$(CONFIG_REGULATOR_PCA9450) += pca9450-regulator.o
+obj-$(CONFIG_REGULATOR_PF8X00) += pf8x00-regulator.o
 obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
 obj-$(CONFIG_REGULATOR_PV88060) += pv88060-regulator.o
 obj-$(CONFIG_REGULATOR_PV88080) += pv88080-regulator.o
diff --git a/drivers/regulator/pf8x00-regulator.c b/drivers/regulator/pf8x00-regulator.c
new file mode 100644
index 000000000000..308c27fa6ea8
--- /dev/null
+++ b/drivers/regulator/pf8x00-regulator.c
@@ -0,0 +1,496 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 NXP
+ * Copyright (C) 2019 Boundary Devices
+ * Copyright (C) 2020 Amarula Solutions(India)
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+
+/* registers */
+#define PF8X00_DEVICEID			0x00
+#define PF8X00_REVID			0x01
+#define PF8X00_EMREV			0x02
+#define PF8X00_PROGID			0x03
+#define PF8X00_IMS_INT			0x04
+#define PF8X00_IMS_THERM		0x07
+#define PF8X00_SW_MODE_INT		0x0a
+#define PF8X00_SW_MODE_MASK		0x0b
+#define PF8X00_IMS_SW_ILIM		0x12
+#define PF8X00_IMS_LDO_ILIM		0x15
+#define PF8X00_IMS_SW_UV		0x18
+#define PF8X00_IMS_SW_OV		0x1b
+#define PF8X00_IMS_LDO_UV		0x1e
+#define PF8X00_IMS_LDO_OV		0x21
+#define PF8X00_IMS_PWRON		0x24
+#define PF8X00_SYS_INT			0x27
+#define PF8X00_HARD_FAULT		0x29
+#define PF8X00_FSOB_FLAGS		0x2a
+#define PF8X00_FSOB_SELECT		0x2b
+#define PF8X00_ABIST_OV1		0x2c
+#define PF8X00_ABIST_OV2		0x2d
+#define PF8X00_ABIST_UV1		0x2e
+#define PF8X00_ABIST_UV2		0x2f
+#define PF8X00_TEST_FLAGS		0x30
+#define PF8X00_ABIST_RUN		0x31
+#define PF8X00_RANDOM_GEN		0x33
+#define PF8X00_RANDOM_CHK		0x34
+#define PF8X00_VMONEN1			0x35
+#define PF8X00_VMONEN2			0x36
+#define PF8X00_CTRL1			0x37
+#define PF8X00_CTRL2			0x38
+#define PF8X00_CTRL3			0x39
+#define PF8X00_PWRUP_CTRL		0x3a
+#define PF8X00_RESETBMCU		0x3c
+#define PF8X00_PGOOD			0x3d
+#define PF8X00_PWRDN_DLY1		0x3e
+#define PF8X00_PWRDN_DLY2		0x3f
+#define PF8X00_FREQ_CTRL		0x40
+#define PF8X00_COINCELL_CTRL		0x41
+#define PF8X00_PWRON			0x42
+#define PF8X00_WD_CONFIG		0x43
+#define PF8X00_WD_CLEAR			0x44
+#define PF8X00_WD_EXPIRE		0x45
+#define PF8X00_WD_COUNTER		0x46
+#define PF8X00_FAULT_COUNTER		0x47
+#define PF8X00_FSAFE_COUNTER		0x48
+#define PF8X00_FAULT_TIMER		0x49
+#define PF8X00_AMUX			0x4a
+#define PF8X00_SW1_CONFIG1		0x4d
+#define PF8X00_LDO1_CONFIG1		0x85
+#define PF8X00_VSNVS_CONFIG1		0x9d
+#define PF8X00_PAGE_SELECT		0x9f
+
+/* regulators */
+enum pf8x00_regulators {
+	PF8X00_LDO1,
+	PF8X00_LDO2,
+	PF8X00_LDO3,
+	PF8X00_LDO4,
+	PF8X00_BUCK1,
+	PF8X00_BUCK2,
+	PF8X00_BUCK3,
+	PF8X00_BUCK4,
+	PF8X00_BUCK5,
+	PF8X00_BUCK6,
+	PF8X00_BUCK7,
+	PF8X00_VSNVS,
+
+	PF8X00_MAX_REGULATORS,
+};
+
+enum pf8x00_buck_states {
+	SW_CONFIG1,
+	SW_CONFIG2,
+	SW_PWRUP,
+	SW_MODE1,
+	SW_RUN_VOLT,
+	SW_STBY_VOLT,
+};
+#define PF8X00_SW_BASE(i)		(8 * (i - PF8X00_BUCK1) + PF8X00_SW1_CONFIG1)
+
+enum pf8x00_ldo_states {
+	LDO_CONFIG1,
+	LDO_CONFIG2,
+	LDO_PWRUP,
+	LDO_RUN_VOLT,
+	LDO_STBY_VOLT,
+};
+#define PF8X00_LDO_BASE(i)		(6 * (i - PF8X00_LDO1) + PF8X00_LDO1_CONFIG1)
+
+enum swxilim_bits {
+	SWXILIM_2100_MA,
+	SWXILIM_2600_MA,
+	SWXILIM_3000_MA,
+	SWXILIM_4500_MA,
+};
+#define PF8X00_SWXILIM_SHIFT		3
+#define PF8X00_SWXILIM_MASK		GENMASK(4, 3)
+#define PF8X00_SWXPHASE_MASK		GENMASK(2, 0)
+#define PF8X00_SWXPHASE_DEFAULT		0
+#define PF8X00_SWXPHASE_SHIFT		7
+
+enum pf8x00_devid {
+	PF8100			= 0x0,
+	PF8121A			= BIT(1),
+	PF8200			= BIT(3),
+};
+#define PF8X00_FAM			BIT(6)
+#define PF8X00_DEVICE_FAM_MASK		GENMASK(7, 4)
+#define PF8X00_DEVICE_ID_MASK		GENMASK(3, 0)
+
+struct pf8x00_regulator {
+	struct regulator_desc desc;
+	u8 ilim;
+	u8 phase_shift;
+};
+
+struct pf8x00_chip {
+	struct regmap *regmap;
+	struct device *dev;
+};
+
+static const struct regmap_config pf8x00_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = PF8X00_PAGE_SELECT,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+/* VLDOx output: 1.5V to 5.0V */
+static const int pf8x00_ldo_voltages[] = {
+	1500000, 1600000, 1800000, 1850000, 2150000, 2500000, 2800000, 3000000,
+	3100000, 3150000, 3200000, 3300000, 3350000, 1650000, 1700000, 5000000,
+};
+
+#define SWV(i)		(6250 * i + 400000)
+#define SWV_LINE(i)	SWV(i*8+0), SWV(i*8+1), SWV(i*8+2), SWV(i*8+3), \
+			SWV(i*8+4), SWV(i*8+5), SWV(i*8+6), SWV(i*8+7)
+
+/* Output: 0.4V to 1.8V */
+static const int pf8x00_sw1_to_6_voltages[] = {
+	SWV_LINE(0),
+	SWV_LINE(1),
+	SWV_LINE(2),
+	SWV_LINE(3),
+	SWV_LINE(4),
+	SWV_LINE(5),
+	SWV_LINE(6),
+	SWV_LINE(7),
+	SWV_LINE(8),
+	SWV_LINE(9),
+	SWV_LINE(10),
+	SWV_LINE(11),
+	SWV_LINE(12),
+	SWV_LINE(13),
+	SWV_LINE(14),
+	SWV_LINE(15),
+	SWV_LINE(16),
+	SWV_LINE(17),
+	SWV_LINE(18),
+	SWV_LINE(19),
+	SWV_LINE(20),
+	SWV_LINE(21),
+	1500000, 1800000,
+};
+
+/* Output: 1.0V to 4.1V */
+static const int pf8x00_sw7_voltages[] = {
+	1000000, 1100000, 1200000, 1250000, 1300000, 1350000, 1500000, 1600000,
+	1800000, 1850000, 2000000, 2100000, 2150000, 2250000, 2300000, 2400000,
+	2500000, 2800000, 3150000, 3200000, 3250000, 3300000, 3350000, 3400000,
+	3500000, 3800000, 4000000, 4100000, 4100000, 4100000, 4100000, 4100000,
+};
+
+/* Output: 1.8V, 3.0V, or 3.3V */
+static const int pf8x00_vsnvs_voltages[] = {
+	0, 1800000, 3000000, 3300000,
+};
+
+static struct pf8x00_regulator *desc_to_regulator(const struct regulator_desc *desc)
+{
+	return container_of(desc, struct pf8x00_regulator, desc);
+}
+
+static void swxilim_select(const struct regulator_desc *desc, int ilim)
+{
+	struct pf8x00_regulator *data = desc_to_regulator(desc);
+	u8 ilim_sel;
+
+	switch (ilim) {
+	case 2100:
+		ilim_sel = SWXILIM_2100_MA;
+		break;
+	case 2600:
+		ilim_sel = SWXILIM_2600_MA;
+		break;
+	case 3000:
+		ilim_sel = SWXILIM_3000_MA;
+		break;
+	case 4500:
+		ilim_sel = SWXILIM_4500_MA;
+		break;
+	default:
+		ilim_sel = SWXILIM_2100_MA;
+		break;
+	}
+
+	data->ilim = ilim_sel;
+}
+
+static int pf8x00_of_parse_cb(struct device_node *np,
+			      const struct regulator_desc *desc,
+			      struct regulator_config *config)
+{
+	struct pf8x00_regulator *data = desc_to_regulator(desc);
+	struct pf8x00_chip *chip = config->driver_data;
+	int phase;
+	int val;
+	int ret;
+
+	ret = of_property_read_u32(np, "nxp,ilim-ma", &val);
+	if (ret)
+		dev_dbg(chip->dev, "unspecified ilim for BUCK%d, use 2100 mA\n",
+			desc->id - PF8X00_LDO4);
+
+	swxilim_select(desc, val);
+
+	ret = of_property_read_u32(np, "nxp,phase-shift", &val);
+	if (ret) {
+		dev_dbg(chip->dev,
+			"unspecified phase-shift for BUCK%d, use 0 degrees\n",
+			desc->id - PF8X00_LDO4);
+		val = PF8X00_SWXPHASE_DEFAULT;
+	}
+
+	phase = val / 45;
+	if ((phase * 45) != val) {
+		dev_warn(config->dev,
+			 "invalid phase_shift %d for BUCK%d, use 0 degrees\n",
+			 (phase * 45), desc->id - PF8X00_LDO4);
+		phase = PF8X00_SWXPHASE_SHIFT;
+	}
+
+	data->phase_shift = (phase >= 1) ? phase - 1 : PF8X00_SWXPHASE_SHIFT;
+
+	return 0;
+}
+
+static const struct regulator_ops pf8x00_ldo_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_table,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+};
+
+static const struct regulator_ops pf8x00_buck_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_table,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+};
+
+static const struct regulator_ops pf8x00_vsnvs_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+};
+
+#define PF8X00LDO(_id, _name, base, voltages)			\
+	[PF8X00_LDO ## _id] = {					\
+		.desc = {					\
+			.name = _name,				\
+			.of_match = _name,			\
+			.regulators_node = "regulators",	\
+			.n_voltages = ARRAY_SIZE(voltages),	\
+			.ops = &pf8x00_ldo_ops,			\
+			.type = REGULATOR_VOLTAGE,		\
+			.id = PF8X00_LDO ## _id,		\
+			.owner = THIS_MODULE,			\
+			.volt_table = voltages,			\
+			.vsel_reg = (base) + LDO_RUN_VOLT,	\
+			.vsel_mask = 0xff,			\
+			.enable_reg = (base) + LDO_CONFIG2,	\
+			.enable_val = 0x2,			\
+			.disable_val = 0x0,			\
+			.enable_mask = 2,			\
+		},						\
+	}
+
+#define PF8X00BUCK(_id, _name, base, voltages)			\
+	[PF8X00_BUCK ## _id] = {				\
+		.desc = {					\
+			.name = _name,				\
+			.of_match = _name,			\
+			.regulators_node = "regulators",	\
+			.of_parse_cb = pf8x00_of_parse_cb,	\
+			.n_voltages = ARRAY_SIZE(voltages),	\
+			.ops = &pf8x00_buck_ops,		\
+			.type = REGULATOR_VOLTAGE,		\
+			.id = PF8X00_BUCK ## _id,		\
+			.owner = THIS_MODULE,			\
+			.volt_table = voltages,			\
+			.vsel_reg = (base) + SW_RUN_VOLT,	\
+			.vsel_mask = 0xff,			\
+			.enable_reg = (base) + SW_MODE1,	\
+			.enable_val = 0x3,			\
+			.disable_val = 0x0,			\
+			.enable_mask = 0x3,			\
+			.enable_time = 500,			\
+		},						\
+	}
+
+#define PF8X00VSNVS(_name, base, voltages)			\
+	[PF8X00_VSNVS] = {					\
+		.desc = {					\
+			.name = _name,				\
+			.of_match = _name,			\
+			.regulators_node = "regulators",	\
+			.n_voltages = ARRAY_SIZE(voltages),	\
+			.ops = &pf8x00_vsnvs_ops,		\
+			.type = REGULATOR_VOLTAGE,		\
+			.id = PF8X00_VSNVS,			\
+			.owner = THIS_MODULE,			\
+			.volt_table = voltages,			\
+			.vsel_reg = (base),			\
+			.vsel_mask = 0x3,			\
+		},						\
+	}
+
+static struct pf8x00_regulator pf8x00_regulators_data[PF8X00_MAX_REGULATORS] = {
+	PF8X00LDO(1, "ldo1", PF8X00_LDO_BASE(PF8X00_LDO1), pf8x00_ldo_voltages),
+	PF8X00LDO(2, "ldo2", PF8X00_LDO_BASE(PF8X00_LDO2), pf8x00_ldo_voltages),
+	PF8X00LDO(3, "ldo3", PF8X00_LDO_BASE(PF8X00_LDO3), pf8x00_ldo_voltages),
+	PF8X00LDO(4, "ldo4", PF8X00_LDO_BASE(PF8X00_LDO4), pf8x00_ldo_voltages),
+	PF8X00BUCK(1, "buck1", PF8X00_SW_BASE(PF8X00_BUCK1), pf8x00_sw1_to_6_voltages),
+	PF8X00BUCK(2, "buck2", PF8X00_SW_BASE(PF8X00_BUCK2), pf8x00_sw1_to_6_voltages),
+	PF8X00BUCK(3, "buck3", PF8X00_SW_BASE(PF8X00_BUCK3), pf8x00_sw1_to_6_voltages),
+	PF8X00BUCK(4, "buck4", PF8X00_SW_BASE(PF8X00_BUCK4), pf8x00_sw1_to_6_voltages),
+	PF8X00BUCK(5, "buck5", PF8X00_SW_BASE(PF8X00_BUCK5), pf8x00_sw1_to_6_voltages),
+	PF8X00BUCK(6, "buck6", PF8X00_SW_BASE(PF8X00_BUCK6), pf8x00_sw1_to_6_voltages),
+	PF8X00BUCK(7, "buck7", PF8X00_SW_BASE(PF8X00_BUCK7), pf8x00_sw7_voltages),
+	PF8X00VSNVS("vsnvs", PF8X00_VSNVS_CONFIG1, pf8x00_vsnvs_voltages),
+};
+
+static int pf8x00_identify(struct pf8x00_chip *chip)
+{
+	unsigned int value;
+	u8 dev_fam, dev_id;
+	const char *name = NULL;
+	int ret;
+
+	ret = regmap_read(chip->regmap, PF8X00_DEVICEID, &value);
+	if (ret) {
+		dev_err(chip->dev, "failed to read chip family\n");
+		return ret;
+	}
+
+	dev_fam = value & PF8X00_DEVICE_FAM_MASK;
+	switch (dev_fam) {
+	case PF8X00_FAM:
+		break;
+	default:
+		dev_err(chip->dev,
+			"Chip 0x%x is not from PF8X00 family\n", dev_fam);
+		return ret;
+	}
+
+	dev_id = value & PF8X00_DEVICE_ID_MASK;
+	switch (dev_id) {
+	case PF8100:
+		name = "PF8100";
+		break;
+	case PF8121A:
+		name = "PF8121A";
+		break;
+	case PF8200:
+		name = "PF8100";
+		break;
+	default:
+		dev_err(chip->dev, "Unknown pf8x00 device id 0x%x\n", dev_id);
+		return -ENODEV;
+	}
+
+	dev_info(chip->dev, "%s PMIC found.\n", name);
+
+	return 0;
+}
+
+static int pf8x00_i2c_probe(struct i2c_client *client)
+{
+	struct regulator_config config = { NULL, };
+	struct pf8x00_chip *chip;
+	int id;
+	int ret;
+
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, chip);
+	chip->dev = &client->dev;
+
+	chip->regmap = devm_regmap_init_i2c(client, &pf8x00_regmap_config);
+	if (IS_ERR(chip->regmap)) {
+		ret = PTR_ERR(chip->regmap);
+		dev_err(&client->dev,
+			"regmap allocation failed with err %d\n", ret);
+		return ret;
+	}
+
+	ret = pf8x00_identify(chip);
+	if (ret)
+		return ret;
+
+	for (id = 0; id < ARRAY_SIZE(pf8x00_regulators_data); id++) {
+		struct pf8x00_regulator *data = &pf8x00_regulators_data[id];
+		struct regulator_dev *rdev;
+
+		config.dev = chip->dev;
+		config.driver_data = chip;
+		config.regmap = chip->regmap;
+
+		rdev = devm_regulator_register(&client->dev, &data->desc, &config);
+		if (IS_ERR(rdev)) {
+			dev_err(&client->dev,
+				"failed to register %s regulator\n", data->desc.name);
+			return PTR_ERR(rdev);
+		}
+
+		if ((id >= PF8X00_BUCK1) && (id <= PF8X00_BUCK7)) {
+			u8 reg = PF8X00_SW_BASE(id) + SW_CONFIG2;
+
+			regmap_update_bits(chip->regmap, reg,
+					   PF8X00_SWXPHASE_MASK,
+					   data->phase_shift);
+
+			regmap_update_bits(chip->regmap, reg,
+					   PF8X00_SWXILIM_MASK,
+					   data->ilim << PF8X00_SWXILIM_SHIFT);
+		}
+	}
+
+	return 0;
+}
+
+static const struct of_device_id pf8x00_dt_ids[] = {
+	{ .compatible = "nxp,pf8x00",},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pf8x00_dt_ids);
+
+static const struct i2c_device_id pf8x00_i2c_id[] = {
+	{ "pf8x00", 0 },
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, pf8x00_i2c_id);
+
+static struct i2c_driver pf8x00_regulator_driver = {
+	.id_table = pf8x00_i2c_id,
+	.driver = {
+		.name = "pf8x00",
+		.of_match_table = pf8x00_dt_ids,
+	},
+	.probe_new = pf8x00_i2c_probe,
+};
+module_i2c_driver(pf8x00_regulator_driver);
+
+MODULE_AUTHOR("Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Troy Kisky <troy.kisky@xxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Regulator Driver for NXP's PF8100/PF8121A/PF8200 PMIC");
+MODULE_LICENSE("GPL v2");
-- 
2.25.1




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