linux-kernel - Re: [PATCH v6 6/6] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver

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Message-ID: <CACRpkdaDB2f5FTY-sk6Ak49GMtqFzV_5Jkway49zSLA6XJkq0A@mail.gmail.com>
Date:   Wed, 31 Oct 2018 09:56:24 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        yuanjiang.yu@...soc.com, Mark Brown <broonie@...nel.org>,
        Craig Tatlor <ctatlor97@...il.com>
Subject: Re: [PATCH v6 6/6] power: supply: Add Spreadtrum SC27XX fuel gauge
 unit driver

On Mon, Oct 22, 2018 at 9:44 AM Baolin Wang <baolin.wang@...aro.org> wrote:

> This patch adds the Spreadtrum SC27XX serial PMICs fuel gauge support,
> which is used to calculate the battery capacity.
>
> Original-by: Yuanjiang Yu <yuanjiang.yu@...soc.com>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> ---
> Changes from v5:
>  - Save the OCV values in micro volts for OCV capacity table.
>  - Use devm_kmemdup() instead of devm_kzalloc() in sc27xx_fgu_hw_init()

Hi Baolin, you can keep my ACK, just adding some nitpicking:

> +struct sc27xx_fgu_data {
> +       struct regmap *regmap;
> +       struct device *dev;
> +       struct power_supply *battery;
> +       u32 base;
> +       struct mutex lock;
> +       struct gpio_desc *gpiod;
> +       struct iio_channel *channel;
> +       bool bat_present;
> +       int internal_resist;
> +       int total_cap;
> +       int init_cap;
> +       int init_clbcnt;
> +       int max_volt;
> +       int table_len;

Can  the above really be negative or should these int:s really
be unsigned int?

> +static int sc27xx_fgu_adc_to_current(int adc)
> +{
> +       return (adc * 1000) / SC27XX_FGU_1000MA_ADC;
> +}
> +
> +static int sc27xx_fgu_adc_to_voltage(int adc)
> +{
> +       return (adc * 1000) / SC27XX_FGU_1000MV_ADC;
> +}

Would you maybe use
DIV_ROUND_CLOSEST(adc*1000, SC27XX_FGU_1000MV_ADC)
on these?

Overall this is a very fine driver and really pretty compared to some
other stuff we have in drivers/power.

Yours,
Linus Walleij