linux-kernel - Re: [PATCH 12/20] regmap: Introduce max_raw_io for regmap_bulk

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Message-ID: <20150812123844.GH19600@pengutronix.de>
Date:	Wed, 12 Aug 2015 14:38:44 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	Jonathan Cameron <jic23@...nel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [PATCH 12/20] regmap: Introduce max_raw_io for
 regmap_bulk_read/write

On Wed, Aug 12, 2015 at 12:49:31PM +0100, Mark Brown wrote:
> On Wed, Aug 12, 2015 at 12:12:37PM +0200, Markus Pargmann wrote:
> 
> > +	/* if set, raw reads/writes are limited to this size */
> > +	size_t max_raw_io;
> > +
> 
> Do this separately for read and write, there's doubtless going to be
> something that has asymmetry.

Okay.

> 
> > +		if (!map->use_single_rw) {
> > +			write_count = total_bytes / map->max_raw_io;
> > +			write_bytes = map->max_raw_io;
> 
> We may not be able to fit a whole number of values into whatever the
> constraint that the bus has is and partial values don't seem like a good
> idea.

Oh right. Will change the calculation so that there are no partial
values being written.

> 
> > +			reg_stride *= write_bytes / val_bytes;
> > +		}
> 
> This is very confusing, regmap already has a concept of stride and this
> isn't the same thing.

Okay, will rename it.

Thanks,

Markus

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