linux-kernel - Re: [PATCH v4 5/5] iio: addac: stx104: Use regmap_read_poll

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Message-ID: <ZC03N4lTqJQWClz4@smile.fi.intel.com>
Date:   Wed, 5 Apr 2023 11:54:15 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/5] iio: addac: stx104: Use
 regmap_read_poll_timeout() for conversion poll

On Tue, Apr 04, 2023 at 10:12:02AM -0400, William Breathitt Gray wrote:
> ADC sample captures take a certain amount of time to complete after
> initiated; this conversion time range can be anywhere from 5 uSec to
> 53.68 Seconds depending on the configuration of the Analog Input Frame
> Timer register. When the conversion is in progress, the ADC Status
> register CNV bit is high. Utilize regmap_read_poll_timeout() to poll
> until the ADC conversion is completed (or timeout if more than 53.68
> Seconds passes).

...

>  		/* trigger ADC sample capture by writing to the 8-bit

Perhaps fix the style here while at it?

		/*
		 * Trigger ADC sample capture by writing to the 8-bit

>  		 * Software Strobe Register and wait for completion
> +		 * Range is 5 uSec to 53.68 Seconds in steps of 25 nanoseconds.

seconds (in SI the small letter is for the unit(s) of seconds).

Same for the commit message.

> +		 * The actual Analog Input Frame Timer time interval is calculated as:
> +		 * ai_time_frame_ns = ( AIFT + 1 ) * ( 25 nSec ).

nSec --> nanosecond

> +		 * Where 0 <= AIFT <= 2147483648.
>  		 */

-- 
With Best Regards,
Andy Shevchenko