On Wed, Aug 29, 2012 at 06:56:52PM +0800, Dong Aisheng wrote:
> +config MFD_SYSCON
> + bool "System Controller Register R/W Based on Regmap"
If the driver only compiles and works for device tree probe, we should
have the following?
depends on OF
> + select REGMAP_MMIO
> + help
> + Select this option to enable accessing system control registers
> + via regmap.
> +
<snip>
> +struct regmap *syscon_node_to_regmap(struct device_node *np)
> +{
> + struct syscon *syscon;
> + struct device *dev;
> +
> + dev = driver_find_device(&syscon_driver.driver, NULL, np,
> + syscon_match);
> + of_node_put(np);
This looks a little unnatural to me. Function syscon_node_to_regmap
becomes an API visible to clients, who might never know that np will
be put inside the API. I'm saying the client may also call of_node_put
to put the node they get.
I think of_node_put should be moved out from here and put into
syscon_node_to_regmap and syscon_regmap_lookup_by_compatible.
Regards,
Shawn
> +
> + if (!dev)
> + return ERR_PTR(-EPROBE_DEFER);
> +
> + syscon = dev_get_drvdata(dev);
> +
> + return syscon->regmap;
> +}
> +EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
> +
> +struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
> +{
> + struct device_node *syscon_np;
> +
> + syscon_np = of_find_compatible_node(NULL, NULL, s);
> + if (!syscon_np)
> + return ERR_PTR(-ENODEV);
> +
> + return syscon_node_to_regmap(syscon_np);
> +}
> +EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
> +
> +struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
> + const char *property)
> +{
> + struct device_node *syscon_np;
> +
> + syscon_np = of_parse_phandle(np, property, 0);
> + if (!syscon_np)
> + return ERR_PTR(-ENODEV);
> +
> + return syscon_node_to_regmap(syscon_np);
> +}
> +EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
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