linux-kernel - Re: [PATCH v2 2/2] regulator: uniphier: add regulator driver for UniPhier SoC

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Date:   Wed, 11 Jul 2018 11:31:35 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH v2 2/2] regulator: uniphier: add regulator driver for UniPhier SoC

Hi Mark,

On Tue, 10 Jul 2018 18:44:51 +0100 <broonie@...nel.org> wrote:

> On Tue, Jul 10, 2018 at 10:27:17AM +0900, Kunihiko Hayashi wrote:
> 
> > +static int uniphier_regulator_enable(struct regulator_dev *rdev)
> > +{
> > +	struct uniphier_regulator_priv *priv = rdev_get_drvdata(rdev);
> > +
> > +	return regmap_update_bits(priv->regmap, rdev->desc->enable_reg,
> > +				  rdev->desc->enable_mask,
> > +				  rdev->desc->enable_val);
> > +}
> 
> This is just regulator_enable_regmap() isn't it?  Same for disable,
> unless I'm missing something (which is possible).

Exactly, it's reasonable to replace this with the helper function.
I'll check and apply it.

> > +static int uniphier_regulator_is_enabled(struct regulator_dev *rdev)
> > +{
> > +	struct uniphier_regulator_priv *priv = rdev_get_drvdata(rdev);
> > +	unsigned int val;
> > +	int ret = -EINVAL;
> > +
> > +	regmap_read(priv->regmap, rdev->desc->enable_reg, &val);
> > +	val &= rdev->desc->enable_mask;
> > +
> > +	if (val == rdev->desc->enable_val)
> > +		ret = 1;
> > +	else if (val == rdev->desc->disable_val)
> > +		ret = 0;
> > +
> > +	return ret;
> > +}
> 
> This isn't *quite* regulator_is_enabled_regmap() as it explicitly checks
> if the disable value is set and errors otherwise which would be a good
> fix for that.  Could you do a patch for that?

Although I'm worried that the register have a value that is neither
enable_val or disable_val, the "is_enabled" function returns whether
the regulator is enabled or not, so I can apply regulator_is_enabled_regmap().
I'll apply it in v3.

Thank you,

---
Best Regards,
Kunihiko Hayashi