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

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Message-ID: <B256D81BAE5131468A838E5D7A243641D63F61F4@penmbx01>
Date:	Wed, 20 Jan 2016 07:26:56 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Peter Korsgaard <peter@...sgaard.com>
CC:	Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
	"Pawel Moll" <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"Ian Campbell" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"Krzysztof Kozlowski" <k.kozlowski@...sung.com>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Javier Martinez Canillas <javier@...hile0.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC MFD
 driver

Hi Peter,

> -----Original Message-----
> From: Peter Korsgaard [mailto:jacmet@...il.com] On Behalf Of Peter Korsgaard
> Sent: 2016年1月15日 15:58
> To: Yang, Wenyou <Wenyou.Yang@...el.com>
> Cc: Lee Jones <lee.jones@...aro.org>; Rob Herring <robh+dt@...nel.org>;
> Pawel Moll <pawel.moll@....com>; Mark Rutland <mark.rutland@....com>; Ian
> Campbell <ijc+devicetree@...lion.org.uk>; Kumar Gala <galak@...eaurora.org>;
> devicetree@...r.kernel.org; Krzysztof Kozlowski <k.kozlowski@...sung.com>;
> Ferre, Nicolas <Nicolas.FERRE@...el.com>; linux-kernel@...r.kernel.org;
> Javier Martinez Canillas <javier@...hile0.org>; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: [PATCH v5 1/2] mfd: act8945a: add Active-semi ACT8945A PMIC
> MFD driver
> 
> >>>>> "Yang," == Yang, Wenyou <Wenyou.Yang@...el.com> writes:
> 
> Hi,
> 
>  >> Why not make it a tristate instead? Having regulators as modules is perhaps
> not a  >> very wise thing to do, but conceptually I don't see why this code couldn't
> be a  >> module.
> 
>  > Yes, you are right. it can be use a tristate.
> 
> Ok, good.
> 
> >> > +	act8945a = devm_kzalloc(&i2c->dev, sizeof(*act8945a),
> >> > +GFP_KERNEL);
>  >> > +	if (!act8945a)
>  >> > +		return -ENOMEM;
>  >> > +
>  >>
>  >> What is the point of this structure (and the header file)? Can't the subdevices
> just  >> do dev_get_regmap(dev->parent)? regulator_register() afaik already does
> this by  >> default.
> 
>  > Yes, I re-read regulator_register() code. It did do dev_get_regmap(dev-
> >parent).
> 
>  > I think this structure should be pointed by dev->parent, this structure is
> necessary.
> 
>  > Yes regulator driver should be simpler.
> 
>  > Moreover, it is used by another sub device, charger. Which don't such code.
> 
> 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.


Best Regards,
Wenyou Yang