Re: [PATCH v3 07/14] mfd: mt6370: Add Mediatek MT6370 support

Andy Shevchenko
2022-06-23T18:57:00Z

On Thu, Jun 23, 2022 at 1:59 PM ChiaEn Wu <peterwu.pub@gmail.com> wrote:
>
> From: ChiYuan Huang <cy_huang@richtek.com>
>
> Add Mediatek MT6370 MFD support.

...

> +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 consists of a single cell battery charger with ADC monitoring, RGB
> + LEDs, dual channel flashlight, WLED backlight driver, display bias
> + voltage supply, one general purpose LDO, and the USB Type-C & PD
> + controller complies with the latest USB Type-C and PD standards.

What will be the module name in case it's chosen to be built as a module?

...

> 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

This whole bunch of drivers is in the wrong place in Makefile.

https://lore.kernel.org/all/20220616182524.7956-2-andriy.shevchenko@linux.intel.com/

...

> +#define MT6370_REG_MAXADDR 0x1FF

Wondering if (BIT(10) - 1) gives a better hint on how hardware limits
this (so it will be clear it's 10-bit address).

...

> +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 MT6370_VENID_RT5081:
> + case MT6370_VENID_RT5081A:
> + case MT6370_VENID_MT6370:
> + case MT6370_VENID_MT6371:
> + case MT6370_VENID_MT6372P:
> + case MT6370_VENID_MT6372CP:

return 0;

> + break;
> + default:
> + dev_err(info->dev, "Unknown Vendor ID 0x%02x\n", devinfo);
> + return -ENODEV;
> + }
> +
> + return 0;

...and drop these two lines?

> +}

...

> + bank_idx = *(u8 *)reg_buf;
> + bank_addr = *(u8 *)(reg_buf + 1);

Why not

const u8 *u8_buf = reg_buf;

bank_idx = u8_buf[0];
bank_addr = u8_buf[1];

?

...

> + if (ret < 0)
> + return ret;
> + else if (ret != val_size)

Redundant 'else'.

> + return -EIO;

...

> + bank_idx = *(u8 *)data;
> + bank_addr = *(u8 *)(data + 1);

As per above.

--
With Best Regards,
Andy Shevchenko