Re: [PATCH v2 08/15] mfd: mt6370: Add Mediatek MT6370 support

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On Mon, 13 Jun 2022, ChiaEn Wu wrote:

> From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> 
> Add Mediatek MT6370 MFD support.
> 
> Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> ---
>  drivers/mfd/Kconfig  |  13 ++
>  drivers/mfd/Makefile |   1 +
>  drivers/mfd/mt6370.c | 349 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 363 insertions(+)
>  create mode 100644 drivers/mfd/mt6370.c
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 3b59456f5545..d9a7524a3e0e 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -937,6 +937,19 @@ config MFD_MT6360
>  	  PMIC part includes 2-channel BUCKs and 2-channel LDOs
>  	  LDO part includes 4-channel LDOs
>  
> +config MFD_MT6370
> +	tristate "Mediatek MT6370 SubPMIC"
> +	select MFD_CORE
> +	select REGMAP_I2C
> +	select REGMAP_IRQ
> +	depends on I2C
> +	help
> +	  Say Y here to enable MT6370 SubPMIC functional support.
> +	  It integrate single cell battery charger with adc monitoring, RGB

s/integrates/consists of a/

"ADC"

> +	  LEDs, dual channel flashlight, WLED backlight driver, display bias

> +	  voltage supply, one general purpose LDO, and cc logic
> +	  controller with USBPD commmunication capable.

The last part makes no sense - "and is USBPD"?

>  config MFD_MT6397
>  	tristate "MediaTek MT6397 PMIC Support"
>  	select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 858cacf659d6..62b27125420e 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -242,6 +242,7 @@ obj-$(CONFIG_INTEL_SOC_PMIC_BXTWC)	+= intel_soc_pmic_bxtwc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC)	+= intel_soc_pmic_chtwc.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_CHTDC_TI)	+= intel_soc_pmic_chtdc_ti.o
>  obj-$(CONFIG_MFD_MT6360)	+= mt6360-core.o
> +obj-$(CONFIG_MFD_MT6370)	+= mt6370.o
>  mt6397-objs			:= mt6397-core.o mt6397-irq.o mt6358-irq.o
>  obj-$(CONFIG_MFD_MT6397)	+= mt6397.o
>  obj-$(CONFIG_INTEL_SOC_PMIC_MRFLD)	+= intel_soc_pmic_mrfld.o
> diff --git a/drivers/mfd/mt6370.c b/drivers/mfd/mt6370.c
> new file mode 100644
> index 000000000000..6af9f73c9c0c
> --- /dev/null
> +++ b/drivers/mfd/mt6370.c
> @@ -0,0 +1,349 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/bits.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +enum {
> +	MT6370_USBC_I2C = 0,
> +	MT6370_PMU_I2C,
> +	MT6370_MAX_I2C
> +};
> +
> +#define MT6370_REG_DEV_INFO	0x100
> +#define MT6370_REG_CHG_IRQ1	0x1C0
> +#define MT6370_REG_CHG_MASK1	0x1E0
> +
> +#define MT6370_VENID_MASK	GENMASK(7, 4)
> +
> +#define MT6370_NUM_IRQREGS	16
> +#define MT6370_USBC_I2CADDR	0x4E
> +#define MT6370_REG_ADDRLEN	2
> +#define MT6370_REG_MAXADDR	0x1FF
> +
> +/* IRQ definitions */
> +#define MT6370_IRQ_DIRCHGON		0
> +#define MT6370_IRQ_CHG_TREG		4
> +#define MT6370_IRQ_CHG_AICR		5
> +#define MT6370_IRQ_CHG_MIVR		6
> +#define MT6370_IRQ_PWR_RDY		7
> +#define MT6370_IRQ_FL_CHG_VINOVP	11
> +#define MT6370_IRQ_CHG_VSYSUV		12
> +#define MT6370_IRQ_CHG_VSYSOV		13
> +#define MT6370_IRQ_CHG_VBATOV		14
> +#define MT6370_IRQ_CHG_VINOVPCHG	15
> +#define MT6370_IRQ_TS_BAT_COLD		20
> +#define MT6370_IRQ_TS_BAT_COOL		21
> +#define MT6370_IRQ_TS_BAT_WARM		22
> +#define MT6370_IRQ_TS_BAT_HOT		23
> +#define MT6370_IRQ_TS_STATC		24
> +#define MT6370_IRQ_CHG_FAULT		25
> +#define MT6370_IRQ_CHG_STATC		26
> +#define MT6370_IRQ_CHG_TMR		27
> +#define MT6370_IRQ_CHG_BATABS		28
> +#define MT6370_IRQ_CHG_ADPBAD		29
> +#define MT6370_IRQ_CHG_RVP		30
> +#define MT6370_IRQ_TSHUTDOWN		31
> +#define MT6370_IRQ_CHG_IINMEAS		32
> +#define MT6370_IRQ_CHG_ICCMEAS		33
> +#define MT6370_IRQ_CHGDET_DONE		34
> +#define MT6370_IRQ_WDTMR		35
> +#define MT6370_IRQ_SSFINISH		36
> +#define MT6370_IRQ_CHG_RECHG		37
> +#define MT6370_IRQ_CHG_TERM		38
> +#define MT6370_IRQ_CHG_IEOC		39
> +#define MT6370_IRQ_ADC_DONE		40
> +#define MT6370_IRQ_PUMPX_DONE		41
> +#define MT6370_IRQ_BST_BATUV		45
> +#define MT6370_IRQ_BST_MIDOV		46
> +#define MT6370_IRQ_BST_OLP		47
> +#define MT6370_IRQ_ATTACH		48
> +#define MT6370_IRQ_DETACH		49
> +#define MT6370_IRQ_HVDCP_STPDONE	51
> +#define MT6370_IRQ_HVDCP_VBUSDET_DONE	52
> +#define MT6370_IRQ_HVDCP_DET		53
> +#define MT6370_IRQ_CHGDET		54
> +#define MT6370_IRQ_DCDT			55
> +#define MT6370_IRQ_DIRCHG_VGOK		59
> +#define MT6370_IRQ_DIRCHG_WDTMR		60
> +#define MT6370_IRQ_DIRCHG_UC		61
> +#define MT6370_IRQ_DIRCHG_OC		62
> +#define MT6370_IRQ_DIRCHG_OV		63
> +#define MT6370_IRQ_OVPCTRL_SWON		67
> +#define MT6370_IRQ_OVPCTRL_UVP_D	68
> +#define MT6370_IRQ_OVPCTRL_UVP		69
> +#define MT6370_IRQ_OVPCTRL_OVP_D	70
> +#define MT6370_IRQ_OVPCTRL_OVP		71
> +#define MT6370_IRQ_FLED_STRBPIN		72
> +#define MT6370_IRQ_FLED_TORPIN		73
> +#define MT6370_IRQ_FLED_TX		74
> +#define MT6370_IRQ_FLED_LVF		75
> +#define MT6370_IRQ_FLED2_SHORT		78
> +#define MT6370_IRQ_FLED1_SHORT		79
> +#define MT6370_IRQ_FLED2_STRB		80
> +#define MT6370_IRQ_FLED1_STRB		81
> +#define mT6370_IRQ_FLED2_STRB_TO	82
> +#define MT6370_IRQ_FLED1_STRB_TO	83
> +#define MT6370_IRQ_FLED2_TOR		84
> +#define MT6370_IRQ_FLED1_TOR		85
> +#define MT6370_IRQ_OTP			93
> +#define MT6370_IRQ_VDDA_OVP		94
> +#define MT6370_IRQ_VDDA_UV		95
> +#define MT6370_IRQ_LDO_OC		103
> +#define MT6370_IRQ_BLED_OCP		118
> +#define MT6370_IRQ_BLED_OVP		119
> +#define MT6370_IRQ_DSV_VNEG_OCP		123
> +#define MT6370_IRQ_DSV_VPOS_OCP		124
> +#define MT6370_IRQ_DSV_BST_OCP		125
> +#define MT6370_IRQ_DSV_VNEG_SCP		126
> +#define MT6370_IRQ_DSV_VPOS_SCP		127
> +
> +struct mt6370_info {
> +	struct i2c_client *i2c[MT6370_MAX_I2C];
> +	struct device *dev;
> +	struct regmap *regmap;
> +	struct regmap_irq_chip_data *irq_data;
> +};

Can we shove all of the above into a header file?

> +static const struct regmap_irq mt6370_irqs[] = {
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHGON, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_TREG, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_AICR, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_MIVR, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_PWR_RDY, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FL_CHG_VINOVP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_VSYSUV, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_VSYSOV, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_VBATOV, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_VINOVPCHG, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_BAT_COLD, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_BAT_COOL, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_BAT_WARM, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_BAT_HOT, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_TS_STATC, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_FAULT, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_STATC, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_TMR, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_BATABS, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_ADPBAD, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_RVP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_TSHUTDOWN, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_IINMEAS, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_ICCMEAS, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHGDET_DONE, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_WDTMR, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_SSFINISH, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_RECHG, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_TERM, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHG_IEOC, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_ADC_DONE, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_PUMPX_DONE, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_BST_BATUV, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_BST_MIDOV, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_BST_OLP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_ATTACH, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DETACH, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_HVDCP_STPDONE, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_HVDCP_VBUSDET_DONE, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_HVDCP_DET, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_CHGDET, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DCDT, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_VGOK, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_WDTMR, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_UC, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_OC, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DIRCHG_OV, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_SWON, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_UVP_D, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_UVP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_OVP_D, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_OVPCTRL_OVP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED_STRBPIN, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED_TORPIN, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED_TX, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED_LVF, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED2_SHORT, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED1_SHORT, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED2_STRB, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED1_STRB, 8),
> +	REGMAP_IRQ_REG_LINE(mT6370_IRQ_FLED2_STRB_TO, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED1_STRB_TO, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED2_TOR, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_FLED1_TOR, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_OTP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_VDDA_OVP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_VDDA_UV, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_LDO_OC, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_BLED_OCP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_BLED_OVP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_VNEG_OCP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_VPOS_OCP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_BST_OCP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_VNEG_SCP, 8),
> +	REGMAP_IRQ_REG_LINE(MT6370_IRQ_DSV_VPOS_SCP, 8)
> +};
> +
> +static const struct regmap_irq_chip mt6370_irq_chip = {
> +	.name		= "mt6370-irqs",
> +	.status_base	= MT6370_REG_CHG_IRQ1,
> +	.mask_base	= MT6370_REG_CHG_MASK1,
> +	.num_regs	= MT6370_NUM_IRQREGS,
> +	.irqs		= mt6370_irqs,
> +	.num_irqs	= ARRAY_SIZE(mt6370_irqs),
> +};
> +
> +static const struct resource mt6370_regulator_irqs[] = {
> +	DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_VPOS_SCP, "db_vpos_scp"),
> +	DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_VNEG_SCP, "db_vneg_scp"),
> +	DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_BST_OCP, "db_vbst_ocp"),
> +	DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_VPOS_OCP, "db_vpos_ocp"),
> +	DEFINE_RES_IRQ_NAMED(MT6370_IRQ_DSV_VNEG_OCP, "db_vneg_ocp"),
> +	DEFINE_RES_IRQ_NAMED(MT6370_IRQ_LDO_OC, "ldo_oc")
> +};
> +
> +static const struct mfd_cell mt6370_devices[] = {
> +	MFD_CELL_OF("adc", NULL, NULL, 0, 0, "mediatek,mt6370-adc"),
> +	MFD_CELL_OF("charger", NULL, NULL, 0, 0, "mediatek,mt6370-charger"),
> +	MFD_CELL_OF("backlight", NULL, NULL, 0, 0, "mediatek,mt6370-backlight"),
> +	MFD_CELL_OF("flashlight", NULL, NULL, 0, 0, "mediatek,mt6370-flashlight"),
> +	MFD_CELL_OF("indicator", NULL, NULL, 0, 0, "mediatek,mt6370-indicator"),
> +	MFD_CELL_OF("tcpc", NULL, NULL, 0, 0, "mediatek,mt6370-tcpc"),
> +	MFD_CELL_RES("regulator", mt6370_regulator_irqs)
> +};
> +
> +static int mt6370_check_vendor_info(struct mt6370_info *info)
> +{
> +	unsigned int devinfo;
> +	int ret;
> +
> +	ret = regmap_read(info->regmap, MT6370_REG_DEV_INFO, &devinfo);
> +	if (ret)
> +		return ret;
> +
> +	switch (FIELD_GET(MT6370_VENID_MASK, devinfo)) {
> +	case 0x8: /* RT5081 */
> +	case 0xA: /* RT5081A */
> +	case 0xE: /* MT6370 */
> +	case 0xF: /* MT6371 */
> +	case 0x9: /* MT6372P */
> +	case 0xB: /* MT6372CP */

Please define these and drop the comments.

> +		break;
> +	default:
> +		dev_err(info->dev, "Not invalid value 0x%02x\n", devinfo);
> +		return -ENODEV;
> +	}
> +
> +	return 0;
> +}
> +
> +static int mt6370_regmap_read(void *context, const void *reg_buf,
> +			      size_t reg_size, void *val_buf, size_t val_size)
> +{
> +	struct mt6370_info *info = context;
> +	u8 bank_idx = *(u8 *)reg_buf, bank_addr = *(u8 *)(reg_buf + 1);

Looks a little scruffy.  Perhaps allocate the values below.

> +	int ret;
> +
> +	ret = i2c_smbus_read_i2c_block_data(info->i2c[bank_idx], bank_addr,
> +					    val_size, val_buf);
> +	if (ret != val_size)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int mt6370_regmap_write(void *context, const void *data, size_t count)
> +{
> +	struct mt6370_info *info = context;
> +	u8 bank_idx = *(u8 *)data, bank_addr = *(u8 *)(data + 1);

As above.

> +	int len = count - MT6370_REG_ADDRLEN;
> +
> +	return i2c_smbus_write_i2c_block_data(info->i2c[bank_idx], bank_addr,
> +					      len, data + MT6370_REG_ADDRLEN);
> +}
> +
> +static const struct regmap_bus mt6370_regmap_bus = {
> +	.read		= mt6370_regmap_read,
> +	.write		= mt6370_regmap_write,
> +};
> +
> +static const struct regmap_config mt6370_regmap_config = {
> +	.reg_bits		= 16,
> +	.val_bits		= 8,
> +	.reg_format_endian	= REGMAP_ENDIAN_BIG,
> +	.max_register		= MT6370_REG_MAXADDR,
> +};
> +
> +static int mt6370_probe(struct i2c_client *i2c)
> +{
> +	struct mt6370_info *info;
> +	struct i2c_client *usbc_i2c;
> +	int ret;
> +
> +	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
> +	if (!info)
> +		return -ENOMEM;
> +
> +	info->dev = &i2c->dev;
> +
> +	usbc_i2c = devm_i2c_new_dummy_device(&i2c->dev, i2c->adapter,
> +					     MT6370_USBC_I2CADDR);
> +	if (IS_ERR(usbc_i2c)) {
> +		ret = PTR_ERR(usbc_i2c);
> +		dev_err(&i2c->dev, "Failed to register usbc i2c client %d\n", ret);

"USB-C I2C"?

> +		return ret;
> +	}
> +
> +	/* Assign I2C client for PMU and TypeC */
> +	info->i2c[MT6370_PMU_I2C] = i2c;
> +	info->i2c[MT6370_USBC_I2C] = usbc_i2c;
> +
> +	info->regmap = devm_regmap_init(&i2c->dev, &mt6370_regmap_bus, info,
> +					&mt6370_regmap_config);
> +	if (IS_ERR(info->regmap)) {
> +		ret = PTR_ERR(info->regmap);
> +		dev_err(&i2c->dev, "Failed to register regmap (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	ret = mt6370_check_vendor_info(info);
> +	if (ret) {
> +		dev_err(&i2c->dev, "Failed to check vendor info (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	ret = devm_regmap_add_irq_chip(&i2c->dev, info->regmap, i2c->irq,
> +				       IRQF_ONESHOT, -1, &mt6370_irq_chip,
> +				       &info->irq_data);
> +	if (ret) {
> +		dev_err(&i2c->dev, "Failed to add irq chip (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
> +				    mt6370_devices, ARRAY_SIZE(mt6370_devices),
> +				    NULL, 0,
> +				    regmap_irq_get_domain(info->irq_data));
> +}
> +
> +static const struct of_device_id mt6370_match_table[] = {
> +	{ .compatible = "mediatek,mt6370", },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, mt6370_match_table);
> +
> +static struct i2c_driver mt6370_driver = {
> +	.driver = {
> +		.name = "mt6370",
> +		.of_match_table = mt6370_match_table,
> +	},
> +	.probe_new = mt6370_probe,
> +};
> +module_i2c_driver(mt6370_driver);
> +
> +MODULE_AUTHOR("ChiYuan Huang <cy_huang@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("MT6370 I2C MFD Driver");

Drop all references to "MFD" please.

> +MODULE_LICENSE("GPL v2");

-- 
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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