linux-kernel - Re: [PATCH v5 3/3] iio: dac: ad3530r: Add driver for AD3530R and AD3531R

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Message-ID: <efec7563-9591-4539-a154-bf486d35df0e@baylibre.com>
Date: Tue, 22 Apr 2025 11:37:06 -0500
From: David Lechner <dlechner@...libre.com>
To: Andy Shevchenko <andy@...nel.org>,
 Kim Seer Paller <kimseer.paller@...log.com>
Cc: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen
 <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Nuno Sá
 <noname.nuno@...il.com>, Nuno Sá <nuno.sa@...log.com>,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH v5 3/3] iio: dac: ad3530r: Add driver for AD3530R and
 AD3531R

On 4/22/25 10:11 AM, Andy Shevchenko wrote:
> On Mon, Apr 21, 2025 at 12:24:54PM +0800, Kim Seer Paller wrote:

...

> 
>> +#define AD3530R_INTERNAL_VREF_MV		2500
> 
> _mV (yes, with Volts and Amperes we use proper spelling).

When did we start doing that? No one asked me to do this in any of the new
drivers I did in the last year, so I didn't know this was a thing we should
be doing.


> 
>> +#define AD3530R_LDAC_PULSE_US			100
> 
> ...
> 
>> +	int (*input_ch_reg)(unsigned int c);
> 
> c? channel?
> 
> ...
> 
>> +	int vref_mv;
> 
> _mV
> 
> ...
> 
>> +static int ad3530r_input_ch_reg(unsigned int c)
>> +{
>> +	return 2 * c + AD3530R_INPUT_CH;
>> +}
>> +
>> +static int ad3531r_input_ch_reg(unsigned int c)
>> +{
>> +	return 2 * c + AD3531R_INPUT_CH;
>> +}
> 
> c --> channel
> 
> ...
> 
>> +static const char * const ad3530r_powerdown_modes[] = {
>> +	"1kohm_to_gnd",
> 
> kOhm
> 
>> +	"7.7kohm_to_gnd",
> 
> Ditto.
> 
>> +	"32kohm_to_gnd",
> 
> Ditto.

These are defined by sysfs ABI, so can't be changed otherwise it would break
userspace.

Comes from...
What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_powerdown_mode

> 
>> +};
>