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mfd: syscon: Add arguments support for syscon reference

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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: Orson Zhai <orson.zhai@unisoc.com>
Tested-by: Baolin Wang <baolin.wang@unisoc.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Orson Zhai 2020-01-21 15:09:38 +08:00 committed by Lee Jones
parent 2f3dc25c01
commit 6a24f567af
2 changed files with 43 additions and 0 deletions
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29
drivers/mfd/syscon.c
View File

@ -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;

14
include/linux/mfd/syscon.h
View File

@ -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__ */