linux-kernel - Re: [PATCH RFC v6 10/10] iio: adc: ad7380: add support for resolution boost

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Date: Mon, 6 May 2024 16:45:06 -0500
From: David Lechner <dlechner@...libre.com>
To: Julien Stephan <jstephan@...libre.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, 
	Nuno Sá <nuno.sa@...log.com>, 
	Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	kernel test robot <lkp@...el.com>, linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v6 10/10] iio: adc: ad7380: add support for resolution boost

On Wed, May 1, 2024 at 9:56 AM Julien Stephan <jstephan@...libre.com> wrote:
>

..

>
> +static int ad7380_prepare_spi_xfer(struct ad7380_state *st, struct spi_transfer *xfer)
> +{
> +       int bits_per_word;
> +
> +       memset(xfer, 0, sizeof(*xfer));
> +
> +       xfer->rx_buf = &st->scan_data.raw;
> +
> +       if (st->resolution_boost_enable == RESOLUTION_BOOST_ENABLE)
> +               bits_per_word = st->chip_info->channels[0].scan_type.realbits;
> +       else
> +               bits_per_word = st->chip_info->channels[0].scan_type.realbits - 2;
> +
> +       xfer->bits_per_word = bits_per_word;
> +
> +       xfer->len = (st->chip_info->num_channels - 1) * BITS_TO_BYTES(bits_per_word);

This needs to be based on storagebits, not realbits.

> +
> +       return bits_per_word;
> +}
> +