linux-kernel - Re: [PATCH v2 2/2] power: supply: add CellWise cw2015 fuel gauge driver

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Message-ID: <20200311081450.GZ1922688@smile.fi.intel.com>
Date:   Wed, 11 Mar 2020 10:14:50 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Tobias Schramm <t.schramm@...jaro.org>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] power: supply: add CellWise cw2015 fuel gauge
 driver

On Tue, Mar 10, 2020 at 07:55:42PM +0100, Tobias Schramm wrote:

> >> +static int cw_read_word(struct cw_battery *cw_bat, u8 reg, u16 *val)
> >> +{
> >> +	u8 reg_val[2];
> >> +	int ret;
> >> +
> >> +	ret = regmap_raw_read(cw_bat->regmap, reg, reg_val, 2);
> >> +	*val = (reg_val[0] << 8) + reg_val[1];
> >> +	return ret;
> >> +}
> > 
> > NIH BE type of readings? Can REGMAP_ENDIAN_BIG help?
> 
> Not really, or can it? Registers on the cw2015 are a wild mix of single
> bytes and words. There does not seem to be a per register override for
> reg_/val_bits.

I see.
Perhaps

	__be16 value;


	ret = regmap(..., (...)value, sizeof(value));
	if (ret)
		return ret; // note, you missed this in above.

	*val = be16_to_cpu(value);
	return 0;

-- 
With Best Regards,
Andy Shevchenko