[PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD driver

On 20.01.2016 16:50, Yang, Wenyou wrote:

Hi Peter,

On 2016/1/20 15:40, Peter Korsgaard wrote:

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"Yang," == Yang, Wenyou [off-list ref] writes:

Hi,

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But the charger driver can just as well do:

  >>
  >> dev_get_regmap(dev->parent);
  >>
  >> instead of:
  >>
  >> dev_get_drvdata(pdev->dev.parent)->regmap.

  > For regulator, it works use the core do dev_get_regmap(dev->parent),
  > but for charger, it need to export *act8945a.

Why?

There is a callback (*get_property)(...), who will read the charger
register via regmap,

but it doesn't provide the argument for regmap.

include/linux/power_supply.h

struct power_supply_desc {
        [ ... ]
        int (*get_property)(struct power_supply *psy,
                             enum power_supply_property psp,
                             union power_supply_propval *val);
        [ ... ]

}

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Just like the regulator core does, your battery driver can do:

dev_get_regmap(dev->parent);

Why can't you store the pointer to regmap as power supply driver data?
There is really no need for the structure containing only one pointer.

BR,
Krzysztof