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-rw-r--r--drivers/pinctrl/core.c29
-rw-r--r--include/linux/pinctrl/machine.h5
2 files changed, 31 insertions, 3 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 138e72f7437..a6386b3a3c1 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -43,6 +43,8 @@ struct pinctrl_maps {
unsigned num_maps;
};
+static bool pinctrl_dummy_state;
+
/* Mutex taken by all entry points */
DEFINE_MUTEX(pinctrl_mutex);
@@ -61,6 +63,19 @@ static LIST_HEAD(pinctrl_maps);
_i_ < _maps_node_->num_maps; \
i++, _map_ = &_maps_node_->maps[_i_])
+/**
+ * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support
+ *
+ * Usually this function is called by platforms without pinctrl driver support
+ * but run with some shared drivers using pinctrl APIs.
+ * After calling this function, the pinctrl core will return successfully
+ * with creating a dummy state for the driver to keep going smoothly.
+ */
+void pinctrl_provide_dummies(void)
+{
+ pinctrl_dummy_state = true;
+}
+
const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
{
/* We're not allowed to register devices without name */
@@ -719,8 +734,18 @@ static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p,
struct pinctrl_state *state;
state = find_state(p, name);
- if (!state)
- return ERR_PTR(-ENODEV);
+ if (!state) {
+ if (pinctrl_dummy_state) {
+ /* create dummy state */
+ dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
+ name);
+ state = create_state(p, name);
+ if (IS_ERR(state))
+ return state;
+ } else {
+ return ERR_PTR(-ENODEV);
+ }
+ }
return state;
}
diff --git a/include/linux/pinctrl/machine.h b/include/linux/pinctrl/machine.h
index 9c4a1986728..7d22ab00343 100644
--- a/include/linux/pinctrl/machine.h
+++ b/include/linux/pinctrl/machine.h
@@ -154,7 +154,7 @@ struct pinctrl_map {
extern int pinctrl_register_mappings(struct pinctrl_map const *map,
unsigned num_maps);
-
+extern void pinctrl_provide_dummies(void);
#else
static inline int pinctrl_register_mappings(struct pinctrl_map const *map,
@@ -163,5 +163,8 @@ static inline int pinctrl_register_mappings(struct pinctrl_map const *map,
return 0;
}
+static inline void pinctrl_provide_dummies(void)
+{
+}
#endif /* !CONFIG_PINCTRL */
#endif