linux-kernel - Re: [PATCH 1/8] regmap: Add generic non-memory mapped register access API

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Date:	Wed, 22 Jun 2011 21:03:14 +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>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lrg@...com>, Graeme Gregory <gg@...mlogic.co.uk>
Subject: Re: [PATCH 1/8] regmap: Add generic non-memory mapped register access
 API

On 06/22/2011 08:45 PM, Mark Brown wrote:
> [...]
> +
> +static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
> +			    unsigned int val_len)
> +{
> +	u8 *u8 = map->work_buf;
> +	int ret;
> +
> +	map->format.format_reg(map->work_buf, reg);
> +
> +	/*
> +	 * Some buses flag reads by setting the high bits in the
> +	 * register addresss; since it's always the high bits for all
> +	 * current formats we can do this here rather than in
> +	 * formatting.  This may break if we get interesting formats.
> +	 */
> +	if (map->bus->read_flag_bit)
> +		u8[0] |= 1 << map->bus->read_flag_bit;

Should be 1 << (map->bus->read_flag_bit - 1)
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