linux-kernel - Re: [PATCH 2/2] iio: adc: ad9467: add support for ad9211

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Message-ID: <d9651903-6b3b-4d9f-aafa-6377e14879a8@vaisala.com>
Date: Wed, 3 Dec 2025 15:33:15 +0200
From: Tomas Melin <tomas.melin@...sala.com>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
 Michael Hennerich <Michael.Hennerich@...log.com>,
 Nuno Sa <nuno.sa@...log.com>, Jonathan Cameron <jic23@...nel.org>,
 David Lechner <dlechner@...libre.com>, Andy Shevchenko <andy@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] iio: adc: ad9467: add support for ad9211

Hi,

On 03/12/2025 14:48, Andy Shevchenko wrote:
> On Wed, Dec 03, 2025 at 12:20:34PM +0000, Tomas Melin wrote:
>> The AD9211 is a 10-bit monolithic sampling analog-to-digital
>> converter optimized for high performance, low power, and ease
>> of use. The product operates at up to a 300 MSPS conversion
>> rate and is optimized for outstanding dynamic performance
>> in wideband carrier and broadband systems.
>>
>> The scale table implemented here is not an exact match with the
>> datasheet as the table presented there is missing some information.
>> The reference presents these values as being linear,
>> but that does not add up. There is information missing in the table.
>> Implemented scale table matches values at the middle and at the ends,
>> smoothing the curve towards middle and end.
>> Impact on end result from deviation in scale factor affects only software
>> using it for scaling. All the possible hw-settings are also available with
>> this implementation.
> 
>> Link: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
> 
> Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf
> 

That will give

WARNING: Unknown link reference 'Datasheet:', use 'Link:' or
'Closes:' instead
#22:
Datasheet:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD9211.pdf

So I would like to keep it as is. Or then please convince checkpatch it
should be accepted as a valid tag ;)



>> Signed-off-by: Tomas Melin <tomas.melin@...sala.com>
> 
> ...
> 
>> +static const struct ad9467_chip_info ad9211_chip_tbl = {
>> +	.name = "ad9211",
>> +	.id = CHIPID_AD9211,
>> +	.max_rate = 300000000UL,
> 
> It's too many 0:s. Less error prone is to write it as
> 
> 	300 * HZ_PER_MHZ
There is no typo here, but I agree with that suggestion, thanks will update.

BR,
Tomas


> 
>> +	.scale_table = ad9211_scale_table,
>> +	.num_scales = ARRAY_SIZE(ad9211_scale_table),
>> +	.channels = ad9211_channels,
>> +	.num_channels = ARRAY_SIZE(ad9211_channels),
>> +	.test_points = AD9647_MAX_TEST_POINTS,
>> +	.test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
>> +			     AN877_ADC_TESTMODE_OFF),
>> +	.test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
>> +	.default_output_mode = AD9211_DEF_OUTPUT_MODE,
>> +	.vref_mask = AD9211_REG_VREF_MASK,
>> +	.has_dco = true,
>> +};
>