linux-kernel - Re: [PATCH v7 5/9] iio: adc: ad7173: refactor ain and vref selection

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Date: Mon, 10 Jun 2024 09:23:49 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: dumitru.ceclan@...log.com
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich
 <Michael.Hennerich@...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>,
 David Lechner <dlechner@...libre.com>,  linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org,  linux-kernel@...r.kernel.org, Dumitru Ceclan
 <mitrutzceclan@...il.com>
Subject: Re: [PATCH v7 5/9] iio: adc: ad7173: refactor ain and vref selection

On Fri, 2024-06-07 at 17:53 +0300, Dumitru Ceclan via B4 Relay wrote:
> From: Dumitru Ceclan <dumitru.ceclan@...log.com>
> 
> Move validation of analog inputs and reference voltage selection to
> separate functions to reduce the size of the channel config parsing
> function and improve readability.
> Add defines for the number of analog inputs in a channel.
> 
> Signed-off-by: Dumitru Ceclan <dumitru.ceclan@...log.com>
> ---

One minor nit that maybe can be tweaked while applying. Anyways, no need for v8
just because of it:

Reviewed-by: Nuno Sa <nuno.sa@...log.com>

>  drivers/iio/adc/ad7173.c | 62 +++++++++++++++++++++++++++++++++--------------
> -
>  1 file changed, 43 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
> index 8631f218b69e..1257303b0cf6 100644
> --- a/drivers/iio/adc/ad7173.c
> +++ b/drivers/iio/adc/ad7173.c
> @@ -60,6 +60,7 @@
>  #define AD7173_CH_SETUP_AINPOS_MASK	GENMASK(9, 5)
>  #define AD7173_CH_SETUP_AINNEG_MASK	GENMASK(4, 0)
>  
> +#define AD7173_NO_AINS_PER_CHANNEL	2
>  #define AD7173_CH_ADDRESS(pos, neg) \
>  	(FIELD_PREP(AD7173_CH_SETUP_AINPOS_MASK, pos) | \
>  	 FIELD_PREP(AD7173_CH_SETUP_AINNEG_MASK, neg))
> @@ -906,13 +907,48 @@ static int ad7173_register_clk_provider(struct iio_dev
> *indio_dev)
>  					   &st->int_clk_hw);
>  }
>  
> +static int ad7173_validate_voltage_ain_inputs(struct ad7173_state *st,
> +					      unsigned int ain0, unsigned int
> ain1)
> +{
> +	struct device *dev = &st->sd.spi->dev;
> +
> +	if (ain0 >= st->info->num_inputs ||
> +	    ain1 >= st->info->num_inputs)
> +		return dev_err_probe(dev, -EINVAL,
> +				     "Input pin number out of range for pair
> (%d %d).\n",
> +				     ain0, ain1);
> +
> +	return 0;
> +}
> +
> +static int ad7173_validate_reference(struct ad7173_state *st, int ref_sel)
> +{
> +	struct device *dev = &st->sd.spi->dev;
> +	int ret;
> +
> +	if (ref_sel == AD7173_SETUP_REF_SEL_INT_REF && !st->info-
> >has_int_ref)
> +		return dev_err_probe(dev, -EINVAL,
> +			"Internal reference is not available on current
> model.\n");
> +
> +	if (ref_sel == AD7173_SETUP_REF_SEL_EXT_REF2 && !st->info->has_ref2)
> +		return dev_err_probe(dev, -EINVAL,
> +			"External reference 2 is not available on current
> model.\n");
> +
> +	ret = ad7173_get_ref_voltage_milli(st, ref_sel);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Cannot use reference %u\n",
> +				     ref_sel);
> +
> +	return 0;

could be return ad7173_get_ref_voltage_milli()...

- Nuno Sá