Messages in this thread Patch in this message | | | From | Enric Balletbo i Serra <> | Subject | [PATCH] mfd: syscon: Add syscon_regmap_lookup_by_phandle_optional() function. | Date | Tue, 27 Oct 2020 22:11:54 +0100 |
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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> ---
drivers/mfd/syscon.c | 13 +++++++++++++ include/linux/mfd/syscon.h | 11 +++++++++++ 2 files changed, 24 insertions(+)
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c index ca465794ea9c..60c5c2b194cc 100644 --- a/drivers/mfd/syscon.c +++ b/drivers/mfd/syscon.c @@ -255,6 +255,19 @@ struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np, } EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_args); +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; diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h index 7f20e9b502a5..a1fe8aedced2 100644 --- a/include/linux/mfd/syscon.h +++ b/include/linux/mfd/syscon.h @@ -28,6 +28,9 @@ extern struct regmap *syscon_regmap_lookup_by_phandle_args( 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) { @@ -59,6 +62,14 @@ static inline struct regmap *syscon_regmap_lookup_by_phandle_args( { return ERR_PTR(-ENOTSUPP); } + +static inline struct regmap *syscon_regmap_lookup_by_phandle_optional( + struct device_node *np, + const char *property) +{ + return ERR_PTR(-ENOTSUPP); +} + #endif #endif /* __LINUX_MFD_SYSCON_H__ */ -- 2.28.0
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