[PATCH] mfd: syscon: add syscon_regmap_lookup_by_phandle()

[PATCH] mfd: syscon: add syscon_regmap_lookup_by_phandle()

[Marcin Niestroj]

This function is handy when syscon is passed as phandle to device_node
property.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
---
 drivers/mfd/syscon.c | 19 +++++++++++++++++++
 include/mfd/syscon.h |  9 +++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index b1ff1b1ea..809941937 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -174,6 +174,25 @@ struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
 	return regmap;
 }
 
+struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
+					const char *property)
+{
+	struct device_node *syscon_np;
+	struct regmap *regmap;
+
+	if (property)
+		syscon_np = of_parse_phandle(np, property, 0);
+	else
+		syscon_np = np;
+
+	if (!syscon_np)
+		return ERR_PTR(-ENODEV);
+
+	regmap = syscon_node_to_regmap(syscon_np);
+
+	return regmap;
+}
+
 static int syscon_probe(struct device_d *dev)
 {
 	struct syscon *syscon;
diff --git a/include/mfd/syscon.h b/include/mfd/syscon.h
index 902f9fa2f..ac33f2d34 100644
--- a/include/mfd/syscon.h
+++ b/include/mfd/syscon.h
@@ -22,6 +22,9 @@ void __iomem *syscon_base_lookup_by_phandle
 	(struct device_node *np, const char *property);
 struct regmap *syscon_node_to_regmap(struct device_node *np);
 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);
 #else
 static inline void __iomem *syscon_base_lookup_by_pdevname(const char *s)
 {
@@ -42,6 +45,12 @@ static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
 {
 	return ERR_PTR(-ENOSYS);
 }
+static inline struct regmap *syscon_regmap_lookup_by_phandle(
+					struct device_node *np,
+					const char *property)
+{
+	return ERR_PTR(-ENOSYS);
+}
 #endif
 
 #endif
-- 
2.21.0


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Re: [PATCH] mfd: syscon: add syscon_regmap_lookup_by_phandle()

[Sascha Hauer]

On Fri, Jun 28, 2019 at 05:37:27PM +0200, Marcin Niestroj wrote:
> This function is handy when syscon is passed as phandle to device_node
> property.
> 
> Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
> ---
>  drivers/mfd/syscon.c | 19 +++++++++++++++++++
>  include/mfd/syscon.h |  9 +++++++++
>  2 files changed, 28 insertions(+)

Applied, thanks

Sascha


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