linux-kernel - Re: [PATCH 3/8] regmap: Add SPI bus support

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Message-ID: <4DFFD738.4090206@metafoo.de>
Date:	Tue, 21 Jun 2011 01:26:48 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	linux-kernel@...r.kernel.org,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>,
	Samuel Oritz <sameo@...ux.intel.com>,
	Graeme Gregory <gg@...mlogic.co.uk>
Subject: Re: [PATCH 3/8] regmap: Add SPI bus support

On 06/20/2011 02:54 PM, Mark Brown wrote:
> [...]
> +
> +static int regmap_spi_read(struct device *dev,
> +			   const void *reg, size_t reg_size,
> +			   void *val, size_t val_size)
> +{
> +	struct spi_device *spi = to_spi_device(dev);
> +
> +	return spi_write_then_read(spi, reg, reg_size, val, val_size);

spi_write_then_read will use a bounce buffer internally, since we already have
our own bounce buffer it is probably better to use the low-level spi interface
directly in this case.
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