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Subject[PATCH v4 1/1] pinctrl: add pinctrl_provide_dummies interface for platforms to use
Date
From: Dong Aisheng <dong.aisheng@linaro.org>

Add a interface pinctrl_provide_dummies for platform to indicate
whether it needs use pinctrl dummy state.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Stephen Warren <swarren@nvidia.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
---
ChangLog v3->v4:
* remove dummy gpio support in pinctrl subsystem.
Let gpio driver decide whether it wants to use pinctrl gpio mux
function.
ChangLog v2->v3:
* Also changed the missed pinctrl gpio APIs in v1.
ChangeLog v1->v2:
* Based on sascha's suggestion, drop using kconfig since it will hide
pinctrl errors on all other boards.
See: https://lkml.org/lkml/2012/4/18/282
It seemed both Linus and Stephen agreed with this way, so i'm ok
with it too.
* add dummy gpio support.
pinctrl gpio in the same situation as state.
* patch name changed.
Original is pinctrl: handle dummy state in core.
* split removing old dt dummy interface into a separate patch
---
drivers/pinctrl/core.c | 29 +++++++++++++++++++++++++++--
include/linux/pinctrl/machine.h | 5 ++++-
2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index ea2412a..d302fdb 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 */
@@ -720,8 +735,18 @@ 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 e4d1de7..ec61e11 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_PINMUX */
#endif
--
1.7.0.4



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