linux-kernel - Re: [PATCH 17/22] power: supply: add battery driver for AXP20X and AXP22X PMICs

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Date:   Thu, 5 Jan 2017 14:34:48 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>, sre@...nel.org,
        linux@...linux.org.uk,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Lee Jones <lee.jones@...aro.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-pm@...r.kernel.org, linux-iio@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        bonbons@...ux-vserver.org, icenowy@...c.xyz,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 17/22] power: supply: add battery driver for AXP20X and
 AXP22X PMICs

On 2 January 2017 at 13:37, Quentin Schulz
<quentin.schulz@...e-electrons.com> wrote:
[...]
> +
> +#define AXP20X_PWR_STATUS_BAT_CHARGING BIT(2)
> +
> +#define AXP20X_PWR_OP_BATT_PRESENT     BIT(5)
> +#define AXP20X_PWR_OP_BATT_ACTIVATED   BIT(3)
> +
> +#define AXP209_FG_PERCENT              GENMASK(6, 0)
> +#define AXP22X_FG_VALID                        BIT(7)
> +
> +#define AXP20X_CHRG_CTRL1_TGT_VOLT     GENMASK(6, 5)
> +#define AXP20X_CHRG_CTRL1_TGT_4_1V     (0 << 5)
> +#define AXP20X_CHRG_CTRL1_TGT_4_15V    BIT(5)

This is just a silly nit, but I would put (1 << 5) here
for readability.

> +#define AXP20X_CHRG_CTRL1_TGT_4_2V     (2 << 5)
> +#define AXP20X_CHRG_CTRL1_TGT_4_36V    (3 << 5)
> +#define AXP20X_CHRG_CTRL1_TGT_CURR     GENMASK(3, 0)
> +
> +#define AXP22X_CHRG_CTRL1_TGT_4_22V    BIT(5)

Ditto.

> +#define AXP22X_CHRG_CTRL1_TGT_4_24V    (3 << 5)
> +
> +#define AXP20X_V_OFF_MASK              GENMASK(2, 0)
> +
> +struct axp20x_batt_ps {
> +       struct regmap *regmap;
> +       struct power_supply *batt;
> +       struct axp20x_dev *axp20x;
> +       struct iio_channel *batt_chrg_i;
> +       struct iio_channel *batt_dischrg_i;
> +       struct iio_channel *batt_v;
> +       u8 axp_id;
> +};
> +
[..]
> +static int axp20x_power_probe(struct platform_device *pdev)
> +{
> +       struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
> +       struct axp20x_batt_ps *axp20x_batt;
> +       struct power_supply_config psy_cfg = {};
> +

To be consistent with the AC power supply and USB power supply,
you might want to call of_device_is_available() here.
Otherwise, the device probes even if "disabled" in the DTS.

> +       axp20x_batt = devm_kzalloc(&pdev->dev, sizeof(*axp20x_batt),
> +                                  GFP_KERNEL);
> +       if (!axp20x_batt)
> +               return -ENOMEM;
> +

Thanks for the good work,
-- 
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar