linux-kernel - Re: [PATCH v6 6/9] iio: adc: ad7173: add support for special inputs

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Date: Fri, 7 Jun 2024 12:34:06 +0300
From: "Ceclan, Dumitru" <mitrutzceclan@...il.com>
To: Nuno Sá <noname.nuno@...il.com>,
 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
Subject: Re: [PATCH v6 6/9] iio: adc: ad7173: add support for special inputs

On 07/06/2024 12:06, Nuno Sá wrote:
> On Thu, 2024-06-06 at 19:07 +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>
>> ---
>>  drivers/iio/adc/ad7173.c | 29 +++++++++++++++++++++++++++--
>>  1 file changed, 27 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
>> index 4040edbd1c32..d16fa081a285 100644
>> --- a/drivers/iio/adc/ad7173.c
>> +++ b/drivers/iio/adc/ad7173.c
>> @@ -66,6 +66,13 @@
>>  	 FIELD_PREP(AD7173_CH_SETUP_AINNEG_MASK, neg))
>>  #define AD7173_AIN_TEMP_POS	17
>>  #define AD7173_AIN_TEMP_NEG	18
>> +#define AD7173_AIN_POW_MON_POS	19
>> +#define AD7173_AIN_POW_MON_NEG	20
>> +#define AD7173_AIN_REF_POS	21
>> +#define AD7173_AIN_REF_NEG	22
>> +
>> +#define AD7173_IS_REF_INPUT(x)		((x) == AD7173_AIN_REF_POS || \
>> +					(x) == AD7173_AIN_REF_NEG)
>>  
>>  #define AD7172_2_ID			0x00d0
>>  #define AD7175_ID			0x0cd0
>> @@ -146,6 +153,8 @@ struct ad7173_device_info {
>>  	unsigned int id;
>>  	char *name;
>>  	bool has_temp;
>> +	/* ((AVDD1 − AVSS)/5) */
>> +	bool has_pow_supply_monitoring;
>>  	bool has_input_buf;
>>  	bool has_int_ref;
>>  	bool has_ref2;
>> @@ -216,6 +225,7 @@ static const struct ad7173_device_info
>> ad7173_device_info[] = {
>>  		.has_temp = true,
>>  		.has_input_buf = true,
>>  		.has_int_ref = true,
>> +		.has_pow_supply_monitoring = true,
>>  		.clock = 2 * HZ_PER_MHZ,
>>  		.sinc5_data_rates = ad7173_sinc5_data_rates,
>>  		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
>> @@ -230,6 +240,7 @@ static const struct ad7173_device_info
>> ad7173_device_info[] = {
>>  		.has_temp = false,
>>  		.has_input_buf = true,
>>  		.has_ref2 = true,
>> +		.has_pow_supply_monitoring = true,
>>  		.clock = 2 * HZ_PER_MHZ,
>>  		.sinc5_data_rates = ad7173_sinc5_data_rates,
>>  		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
>> @@ -245,6 +256,7 @@ static const struct ad7173_device_info
>> ad7173_device_info[] = {
>>  		.has_input_buf = true,
>>  		.has_int_ref = true,
>>  		.has_ref2 = true,
>> +		.has_pow_supply_monitoring = false,
> 
> No need to set the 'false' cases...
> 
> 
> - Nuno Sá

This was suggested by David Lechner to ensure consistency with has_temp
regarding another field, I considered that it would apply here as well.
https://lore.kernel.org/all/CAMknhBGaJxXvsQ8cZkgDsKLVjOY5y2pzox-99hdOCrUaoZdsxg@mail.gmail.com/

This would also increase visibility towards what features does a specific
model support as it is clearly stated with "= false" rather than looking
for what fields are not set within the struct.