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pinctrl: add pinctrl_provide_dummies interface for platforms to use

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

ChangeLog v3->v4:
* remove dummy gpio support in pinctrl subsystem.
  Let gpio driver decide whether it wants to use pinctrl gpio mux
  function.
ChangeLog 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

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Dong Aisheng 2012-04-26 16:15:50 +08:00 committed by Linus Walleij
parent ad6e1107ba
commit 5b3aa5f7c6
2 changed files with 31 additions and 3 deletions
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29
drivers/pinctrl/core.c
View File

@ -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;
}

5
include/linux/pinctrl/machine.h
View File

@ -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