linux-kernel - Re: [PATCH v5 09/13] iio: adc: mt6370: Add MediaTek MT6370 support

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Date:   Fri, 15 Jul 2022 15:18:16 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     ChiaEn Wu <peterwu.pub@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>, Pavel Machek <pavel@....cz>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Helge Deller <deller@....de>,
        ChiaEn Wu <chiaen_wu@...htek.com>,
        Alice Chen <alice_chen@...htek.com>,
        cy_huang <cy_huang@...htek.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>,
        szuni chen <szunichen@...il.com>
Subject: Re: [PATCH v5 09/13] iio: adc: mt6370: Add MediaTek MT6370 support

On Fri, Jul 15, 2022 at 1:28 PM ChiaEn Wu <peterwu.pub@...il.com> wrote:
>
> From: ChiaEn Wu <chiaen_wu@...htek.com>
>
> MediaTek MT6370 is a SubPMIC consisting 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.
>
> This adds support the MT6370 ADC driver for system monitoring, including

This adds --> Add a

> charger current, voltage, and temperature.

...

> +#include <linux/bits.h>
> +#include <linux/bitfield.h>
> +#include <linux/iio/iio.h>
> +#include <linux/kernel.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/sysfs.h>

...

> +#define MT6370_AICR_400MA              0x6
> +#define MT6370_ICHG_500MA              0x4
> +#define MT6370_ICHG_900MA              0x8

_mA ?

...

> +       ret = regmap_read_poll_timeout(priv->regmap,
> +                                      MT6370_REG_CHG_ADC, reg_val,
> +                                      !(reg_val & MT6370_ADC_START_MASK),
> +                                      ADC_CONV_POLLING_TIME_US,
> +                                      ADC_CONV_TIME_MS * 1000 * 3);

1000 --> MILLI ?

...

> +static int mt6370_adc_probe(struct platform_device *pdev)
> +{

Given comment in one place in the entire series would be good to use
in another where appropriate. For example, here it would also be nice
to have a temporary variable

  struct device *dev = &pdev->dev;

It will shorten some lines.

> +       struct mt6370_adc_data *priv;
> +       struct iio_dev *indio_dev;
> +       struct regmap *regmap;
> +       int ret;

> +}

-- 
With Best Regards,
Andy Shevchenko