This adds syscon_regmap_lookup_by_phandle_optional() function to get an
optional regmap.
It behaves the same as syscon_regmap_lookup_by_phandle() except where
there is no regmap phandle. In this case, instead of returning -ENODEV,
the function returns NULL. This makes error checking simpler when the
regmap phandle is optional.
Suggested-by: Nicolas Boichat <drinkcat@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_args);
+/*
+ * It behaves the same as syscon_regmap_lookup_by_phandle() except where
+ * there is no regmap phandle. In this case, instead of returning -ENODEV,
+ * the function returns NULL.
+ */
+struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
+ const char *property)
+{
+ struct regmap *regmap;
+
+ regmap = syscon_regmap_lookup_by_phandle(np, property);
+ if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)
+ return NULL;
+
+ return regmap;
+}
+EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_optional);
+
static int syscon_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const char *property,
int arg_count,
unsigned int *out_args);
+extern struct regmap *syscon_regmap_lookup_by_phandle_optional(
+ struct device_node *np,
+ const char *property);
#else
static inline struct regmap *device_node_to_regmap(struct device_node *np)
{
{
return ERR_PTR(-ENOTSUPP);
}
+
+static inline struct regmap *syscon_regmap_lookup_by_phandle_optional(
+ struct device_node *np,
+ const char *property)
+{
+ return NULL;
+}
+
#endif
#endif /* __LINUX_MFD_SYSCON_H__ */