linux-kernel - Re: [PATCH] spi: add spi_sync_single_transfer wrapper for single spi

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Message-id: <20160617004311.GA911@samsunx.samsung>
Date:	Fri, 17 Jun 2016 09:43:11 +0900
From:	Andi Shyti <andi.shyti@...sung.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Andi Shyti <andi@...zian.org>
Subject: Re: [PATCH] spi: add spi_sync_single_transfer wrapper for single
 spi_transfer

Hi Lars,

> > The spi_sync_single_transfer function calls spi_sync_transfer
> > with a single spi_transfer element, instead of an array.
> 
> So, what's the advantage of using this as opposed to calling
> spi_sync_transfer with a 1 for the number of transfers?

Not much, but it keeps the code a bit nicer to read for those
using spi_sync_transfer with only one spi_transfer. Besides it's
also more understandable what the function itself does and there
would not be any need to jump into the spi_sync_transfer to check
what the number '1' is needed for (for example it's not a boolean 
'true' value).

I checked and there are quite many uses of spi_sync_transfer with
only 1 transfer.

Thanks,
Andi