linux-kernel - Re: [PATCH v2 2/2] iio: magnetometer: add ti tmag5273 driver

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Message-ID: <f3fbf861-37c6-3bcf-615b-2f55261fbf90@wolfvision.net>
Date:   Wed, 23 Nov 2022 10:58:47 +0100
From:   Gerald Loacker <gerald.loacker@...fvision.net>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Jakob Hauser <jahau@...ketmail.com>,
        Michael Riesch <michael.riesch@...fvision.net>
Subject: Re: [PATCH v2 2/2] iio: magnetometer: add ti tmag5273 driver



Am 21.11.2022 um 15:04 schrieb Andy Shevchenko:
> On Mon, Nov 21, 2022 at 01:35:42PM +0100, Gerald Loacker wrote:
>> Add support for TI TMAG5273 Low-Power Linear 3D Hall-Effect Sensor.
>> Additionally to temperature and magnetic X, Y and Z-axes the angle and
>> magnitude are reported.
>> The sensor is operating in continuous measurement mode and changes to sleep
>> mode if not used for 5 seconds.
> 
> Thank you for an update! My comments below.
> (I believe the next version will be ready for inclusion)
> 
> ...
> 
>> +static const struct {
>> +	unsigned int scale_int;
>> +	unsigned int scale_micro;
> 
> Can we have a separate patch to define this one eventually in the (one of) IIO
> generic headers? It's a bit pity that every new driver seems to reinvent the
> wheel.
> 
>> +} tmag5273_scale_table[4][2] = {
>> +	{ { 0, 0 }, { 0, 0 } },
>> +	{ { 0, 12200 }, { 0, 24400 } },
>> +	{ { 0, 40600 }, { 0, 81200 } },
>> +	{ { 0, 0 }, { 0, 0 } },
>> +};
> 

I'm thinking of defining structs for all similar types of IIO output
formats in iio.h like this:


struct iio_val_int_plus_micro {
	int val_int;
	int val_micro;
};

struct iio_val_int_plus_nano {
	int val_int;
	int val_nano;
};

struct iio_val_int_plus_micro_db {
	int val_int;
	int val_micro_db;
};

struct iio_val_fractional {
	int dividend;
	int divisor;
};

struct iio_val_fractional_log2 {
	int dividend;
	int divisor;
};


Do you agree?

Regards,
Gerald