linux-kernel - Re: [PATCH v3 4/6] iio: adc: ad7173: add support for special inputs

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Message-ID: <3b2a1ce579251726a56bdad25bfdfe75bae91c2e.camel@gmail.com>
Date: Wed, 29 May 2024 14:29:18 +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 v3 4/6] iio: adc: ad7173: add support for special inputs

On Mon, 2024-05-27 at 20:02 +0300, Dumitru Ceclan via B4 Relay wrote:
> From: Dumitru Ceclan <dumitru.ceclan@...log.com>
> 
>  Add support for selecting REF+ and REF- inputs on all models.
>  Add support for selecting ((AVDD1 − AVSS)/5) inputs
>   on supported models.
> 
> Signed-off-by: Dumitru Ceclan <dumitru.ceclan@...log.com>
> ---

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

>  drivers/iio/adc/ad7173.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
> index 8a53821c8e58..106a50dbabd4 100644
> --- a/drivers/iio/adc/ad7173.c
> +++ b/drivers/iio/adc/ad7173.c
> @@ -65,6 +65,10 @@
>  	 FIELD_PREP(AD7173_CH_SETUP_AINNEG_MASK, neg))
>  #define AD7173_AIN_TEMP_POS	17
>  #define AD7173_AIN_TEMP_NEG	18
> +#define AD7173_AIN_COM_IN_POS	19
> +#define AD7173_AIN_COM_IN_NEG	20
> +#define AD7173_AIN_REF_POS	21
> +#define AD7173_AIN_REF_NEG	22
>  
>  #define AD7172_2_ID			0x00d0
>  #define AD7175_ID			0x0cd0
> @@ -145,6 +149,8 @@ struct ad7173_device_info {
>  	unsigned int id;
>  	char *name;
>  	bool has_temp;
> +	/* ((AVDD1 − AVSS)/5) */
> +	bool has_common_input;
>  	bool has_input_buf;
>  	bool has_int_ref;
>  	bool has_ref2;
> @@ -215,6 +221,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
>  		.has_temp = true,
>  		.has_input_buf = true,
>  		.has_int_ref = true,
> +		.has_common_input = true,
>  		.clock = 2 * HZ_PER_MHZ,
>  		.sinc5_data_rates = ad7173_sinc5_data_rates,
>  		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
> @@ -229,6 +236,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
>  		.has_temp = false,
>  		.has_input_buf = true,
>  		.has_ref2 = true,
> +		.has_common_input = true,
>  		.clock = 2 * HZ_PER_MHZ,
>  		.sinc5_data_rates = ad7173_sinc5_data_rates,
>  		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
> @@ -244,6 +252,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
>  		.has_input_buf = true,
>  		.has_int_ref = true,
>  		.has_ref2 = true,
> +		.has_common_input = false,
>  		.clock = 2 * HZ_PER_MHZ,
>  		.sinc5_data_rates = ad7173_sinc5_data_rates,
>  		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
> @@ -258,6 +267,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
>  		.has_temp = true,
>  		.has_input_buf = true,
>  		.has_int_ref = true,
> +		.has_common_input = true,
>  		.clock = 16 * HZ_PER_MHZ,
>  		.sinc5_data_rates = ad7175_sinc5_data_rates,
>  		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
> @@ -273,6 +283,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
>  		.has_input_buf = true,
>  		.has_int_ref = true,
>  		.has_ref2 = true,
> +		.has_common_input = true,
>  		.clock = 16 * HZ_PER_MHZ,
>  		.sinc5_data_rates = ad7175_sinc5_data_rates,
>  		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
> @@ -287,6 +298,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
>  		.has_temp = false,
>  		.has_input_buf = false,
>  		.has_int_ref = true,
> +		.has_common_input = false,
>  		.clock = 16 * HZ_PER_MHZ,
>  		.sinc5_data_rates = ad7175_sinc5_data_rates,
>  		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
> @@ -301,6 +313,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
>  		.has_temp = true,
>  		.has_input_buf = true,
>  		.has_int_ref = true,
> +		.has_common_input = true,
>  		.clock = 16 * HZ_PER_MHZ,
>  		.odr_start_value = AD7177_ODR_START_VALUE,
>  		.sinc5_data_rates = ad7175_sinc5_data_rates,
> @@ -915,6 +928,14 @@ static int ad7173_validate_voltage_ain_inputs(struct
> ad7173_state *st,
>  		if (ain[i] < st->info->num_inputs)
>  			continue;
>  
> +		if (ain[i] == AD7173_AIN_REF_POS || ain[i] == AD7173_AIN_REF_NEG)
> +			continue;
> +
> +		if ((ain[i] == AD7173_AIN_COM_IN_POS ||
> +		     ain[i] == AD7173_AIN_COM_IN_NEG) &&
> +		    st->info->has_common_input)
> +			continue;
> +
>  		return dev_err_probe(dev, -EINVAL,
>  			"Input pin number out of range for pair (%d %d).\n",
>  			ain[0], ain[1]);
>