mfd: syscon: implement device_node_to_regmap

Extend our syscon API with a device_node_to_regmap function that has the
same semantics as upstream:

 __________________________________________________________________________
| Linux commit 39233b7c611248c0d05209b4854bc63e26485655
| CommitDate: Thu Aug 8 15:30:07 2019 -0700
|
| mfd/syscon: Add device_node_to_regmap()
|
| device_node_to_regmap() is exactly like syscon_node_to_regmap(), but it
| does not check that the node is compatible with "syscon", and won't
| attach the first clock it finds to the regmap.
|
| The rationale behind this, is that one device node with a standard
| compatible string "foo,bar" can be covered by multiple drivers sharing a
| regmap, or by a single driver doing all the job without a regmap, but
| these are implementation details which shouldn't reflect on the
| devicetree.
|
| Signed-off-by: Paul Cercueil <paul@crapouillou.net>
| Acked-by: Arnd Bergmann <arnd@arndb.de>
| Signed-off-by: Paul Burton <paul.burton@mips.com>
|__________________________________________________________________________

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/mfd/syscon.h b/include/mfd/syscon.h
index ac33f2d347..b47aa1e160 100644
--- a/include/mfd/syscon.h
+++ b/include/mfd/syscon.h
@@ -21,6 +21,7 @@ void __iomem *syscon_base_lookup_by_pdevname(const char *s);
 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 *device_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,
@@ -41,6 +42,10 @@ static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
 {
 	return ERR_PTR(-ENOSYS);
 }
+static inline struct regmap *device_node_to_regmap(struct device_node *np)
+{
+	return ERR_PTR(-ENOSYS);
+}
 static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
 {
 	return ERR_PTR(-ENOSYS);