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SubjectRe: [PATCH] mfd: syscon: Add syscon_regmap_lookup_by_phandle_optional() function.
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On 27/10/2020 22:11, Enric Balletbo i Serra wrote:
> 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>

> ---
>
> 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__ */
>

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