linux-kernel - Re: [PATCH 1/6 v3] regmap: Introduce caching support

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Date:	Thu, 15 Sep 2011 17:11:17 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
CC:	linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>,
	Graeme Gregory <gg@...mlogic.co.uk>,
	Samuel Oritz <sameo@...ux.intel.com>
Subject: Re: [PATCH 1/6 v3] regmap: Introduce caching support

Tested-by: Lars-Peter Clausen <lars@...afoo.de> (for REGCACHE_NONE and
REGCACHE_RBTREE)

Some minor comments though:

> -
> +/**
> + * regcache_read: Fetch the value of a given register from the cache.
> + *
> + * @map: map to configure.
> + * @reg: The register index.
> + * @value: The value to be returned.
> + *
> + * Return a negative value on failure, 0 on success.
> + */
> +int regcache_read(struct regmap *map,
> +		  unsigned int reg, unsigned int *value)
> +{
> +	unsigned int max_reg;
> +
> +	if (map->cache_type == REGCACHE_NONE)
> +		return -ENOSYS;
> +
> +	BUG_ON(!map->cache_ops);
> +
> +	if (!regmap_readable(map, reg))
> +		return -EIO;
> +
> +	if (map->max_register)
> +		max_reg = map->max_register;
> +	else
> +		max_reg = map->num_cache_defaults_raw;

In my opinion we should initialize max_register to num_cache_defaults_raw if it
is not set during initialization instead of doing this check each time. Also
regmap_readable already checks whether the register is in the register range,
so there is no need to repeat the check here.

> +
> +
> +	if (reg < max_reg && !regmap_volatile(map, reg))
> +		return map->cache_ops->read(map, reg, value);
> +	return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(regcache_read);
> +
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