Commit 6a24f567 authored by Orson Zhai's avatar Orson Zhai Committed by Lee Jones
Browse files

mfd: syscon: Add arguments support for syscon reference 



There are a lot of similar global registers being used across multiple SoCs
from Unisoc. But most of these registers are assigned with different offset
for different SoCs. It is hard to handle all of them in an all-in-one
kernel image.

Add a helper function to get regmap with arguments where we could put some
extra information such as the offset value.

Signed-off-by: default avatarOrson Zhai <orson.zhai@unisoc.com>
Tested-by: default avatarBaolin Wang <baolin.wang@unisoc.com>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 2f3dc25c

drivers/mfd/syscon.c

+29 −0
Original line number Diff line number Diff line
@@ -224,6 +224,35 @@ struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np, 
}

EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);



struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,

					const char *property,

					int arg_count,

					unsigned int *out_args)

{

	struct device_node *syscon_np;

	struct of_phandle_args args;

	struct regmap *regmap;

	unsigned int index;

	int rc;



	rc = of_parse_phandle_with_fixed_args(np, property, arg_count,

			0, &args);

	if (rc)

		return ERR_PTR(rc);



	syscon_np = args.np;

	if (!syscon_np)

		return ERR_PTR(-ENODEV);



	regmap = syscon_node_to_regmap(syscon_np);

	for (index = 0; index < arg_count; index++)

		out_args[index] = args.args[index];

	of_node_put(syscon_np);



	return regmap;

}

EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_args);



static int syscon_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

include/linux/mfd/syscon.h

+14 −0
Original line number Diff line number Diff line
@@ -23,6 +23,11 @@ extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s); 
extern struct regmap *syscon_regmap_lookup_by_phandle(

					struct device_node *np,

					const char *property);

extern struct regmap *syscon_regmap_lookup_by_phandle_args(

					struct device_node *np,

					const char *property,

					int arg_count,

					unsigned int *out_args);

#else

static inline struct regmap *device_node_to_regmap(struct device_node *np)

{
@@ -45,6 +50,15 @@ static inline struct regmap *syscon_regmap_lookup_by_phandle( 
{

	return ERR_PTR(-ENOTSUPP);

}



static struct regmap *syscon_regmap_lookup_by_phandle_args(

					struct device_node *np,

					const char *property,

					int arg_count,

					unsigned int *out_args)

{

	return ERR_PTR(-ENOTSUPP);

}

#endif



#endif /* __LINUX_MFD_SYSCON_H__ */

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