linux-kernel - Re: [PATCH v2 1/2] extcon-intel-cht-wc: Make charger detection co-existed with OTG host mode

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Message-ID: <20190220204655.GB23567@jeknote.loshitsa1.net>
Date:   Wed, 20 Feb 2019 23:46:55 +0300
From:   Yauhen Kharuzhy <jekhor@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v2 1/2] extcon-intel-cht-wc: Make charger detection
 co-existed with OTG host mode

On Wed, Feb 20, 2019 at 02:42:06PM +0200, Andy Shevchenko wrote:
> On Wed, Feb 20, 2019 at 12:24:40AM +0300, Yauhen Kharuzhy wrote:
> > Whiskey Cove Cherry Trail PMIC requires disabling OTG host mode before
> > of charger detection procedure. Do this by manipulationg of CHGRCTRL1
> > register.
> > 
> > Source: APCI DSDT code of Lenovo Yoga Book YB1-X91L and open-sourced
> > Intel's drivers.
> 
> Some minor comments below.
> 
> Otherwise,
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> 
> > -#define CHT_WC_CHGRCTRL1		0x5e17
> > +#define CHT_WC_CHGRCTRL1			0x5e17
> 
> Not related change?

just alignment, yes.

> 
> > +#define CHT_WC_CHGRCTRL1_DBPEN_MASK		BIT(7)
> 
> Drop the _MASK, it's one bit anyway.
OK.

> 
> > +#define CHT_WC_CHGRCTRL1_OTGMODE		BIT(6)
> > +#define CHT_WC_CHGRCTRL1_FTEMP_EVENT		BIT(5)
> > +#define CHT_WC_CHGRCTRL1_FUSB_INLMT_1500	BIT(4)
> > +#define CHT_WC_CHGRCTRL1_FUSB_INLMT_900		BIT(3)
> > +#define CHT_WC_CHGRCTRL1_FUSB_INLMT_500		BIT(2)
> > +#define CHT_WC_CHGRCTRL1_FUSB_INLMT_150		BIT(1)
> > +#define CHT_WC_CHGRCTRL1_FUSB_INLMT_100		BIT(0)
> 
> I think better to keep ascending order.

OK.

> 
> > +static void cht_wc_extcon_set_otgmode(struct cht_wc_extcon_data *ext,
> > +				      bool enable)
> > +{
> > +	unsigned int chgrctrl1;
> > +	int ret;
> > +
> > +	ret = regmap_read(ext->regmap, CHT_WC_CHGRCTRL1, &chgrctrl1);
> > +	if (ret) {
> > +		dev_err(ext->dev, "Error reading CHGRCTRL1 reg: %d\n", ret);
> > +		return;
> > +	}
> > +
> > +	if (enable)
> > +		chgrctrl1 |= CHT_WC_CHGRCTRL1_OTGMODE;
> > +	else
> > +		chgrctrl1 &= ~(CHT_WC_CHGRCTRL1_OTGMODE);
> 
> Redundant parens.

Hmm... Why I didn't use regmap_update_bits() here... I will simplify this
piece with it.

Thanks!

-- 
Yauhen Kharuzhy