linux-kernel - RE: [PATCH v2 6/7] iio: adc: ad485x: add ad485x driver

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Message-ID:
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Date: Tue, 8 Oct 2024 10:48:07 +0000
From: "Miclaus, Antoniu" <Antoniu.Miclaus@...log.com>
To: Andy Shevchenko <andy.shevchenko@...il.com>
CC: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>, "Sa, Nuno" <Nuno.Sa@...log.com>,
        Olivier Moysan
	<olivier.moysan@...s.st.com>,
        Uwe Kleine-König
	<ukleinek@...nel.org>,
        Andy Shevchenko <andy@...nel.org>,
        David Lechner
	<dlechner@...libre.com>,
        "Schmitt, Marcelo" <Marcelo.Schmitt@...log.com>,
        Mike Looijmans <mike.looijmans@...ic.nl>,
        Marius Cristea
	<marius.cristea@...rochip.com>,
        Dumitru Ceclan <mitrutzceclan@...il.com>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
        Alisa-Dariana Roman <alisadariana@...il.com>,
        Ivan Mikhaylov
	<fr0st61te@...il.com>,
        "Cuciurean, Sergiu" <Sergiu.Cuciurean@...log.com>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>,
        "linux-iio@...r.kernel.org"
	<linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
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	<devicetree@...r.kernel.org>,
        "linux-pwm@...r.kernel.org"
	<linux-pwm@...r.kernel.org>
Subject: RE: [PATCH v2 6/7] iio: adc: ad485x: add ad485x driver

> > +static int ad485x_get_calibscale(struct ad485x_state *st, int ch, int *val, int
> *val2)
> > +{
> > +       unsigned int reg_val;
> > +       int gain;
> 
> Should be u8 gain[2] and...

As discussed in previous patch series, the bulk operations won't work for these
chips. The CS needs to be raised between each byte read/written.

Therefore using u8 gain[2]  here  and in other places will be just an extra populated
array since  regmap_read requires `unsigned int` as input.

For the set functions indeed it is feasible since you can pass u8 directly to regmap_write.

Regards,
Antoniu
> > +       int ret;
> > +
> > +       guard(mutex)(&st->lock);
> > +
> > +       ret = regmap_read(st->regmap, AD485X_REG_CHX_GAIN_MSB(ch),
> > +                         &reg_val);
> > +       if (ret)
> > +               return ret;
> > +
> > +       gain = (reg_val & 0xFF) << 8;
> > +
> > +       ret = regmap_read(st->regmap, AD485X_REG_CHX_GAIN_LSB(ch),
> > +                         &reg_val);
> > +       if (ret)
> > +               return ret;
> > +
> > +       gain |= reg_val & 0xFF;
> 
...