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pinctrl: API changes to support multiple states per device

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The API model is changed from:

p = pinctrl_get(dev, "state1");
pinctrl_enable(p);
...
pinctrl_disable(p);
pinctrl_put(p);
p = pinctrl_get(dev, "state2");
pinctrl_enable(p);
...
pinctrl_disable(p);
pinctrl_put(p);

to this:

p = pinctrl_get(dev);
s1 = pinctrl_lookup_state(p, "state1");
s2 = pinctrl_lookup_state(p, "state2");
pinctrl_select_state(p, s1);
...
pinctrl_select_state(p, s2);
...
pinctrl_put(p);

This allows devices to directly transition between states without
disabling the pin controller programming and put()/get()ing the
configuration data each time. This model will also better suit pinconf
programming, which doesn't have a concept of "disable".

The special-case hogging feature of pin controllers is re-written to use
the regular APIs instead of special-case code. Hence, the pinmux-hogs
debugfs file is removed; see the top-level pinctrl-handles files for
equivalent data.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stephen Warren
2012-03-02 13:05:47 -07:00
committed by Linus Walleij
parent 0e3db173e2
commit 6e5e959dde
7 changed files with 379 additions and 229 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
include/linux/pinctrl/consumer.h
View File

@@ -12,12 +12,14 @@
#ifndef __LINUX_PINCTRL_CONSUMER_H
#define __LINUX_PINCTRL_CONSUMER_H
#include <linux/err.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include "pinctrl.h"
/* This struct is private to the core and should be regarded as a cookie */
struct pinctrl;
struct pinctrl_state;
#ifdef CONFIG_PINCTRL
@@ -26,10 +28,13 @@ extern int pinctrl_request_gpio(unsigned gpio);
extern void pinctrl_free_gpio(unsigned gpio);
extern int pinctrl_gpio_direction_input(unsigned gpio);
extern int pinctrl_gpio_direction_output(unsigned gpio);
extern struct pinctrl * __must_check pinctrl_get(struct device *dev, const char *name);
extern struct pinctrl * __must_check pinctrl_get(struct device *dev);
extern void pinctrl_put(struct pinctrl *p);
extern int pinctrl_enable(struct pinctrl *p);
extern void pinctrl_disable(struct pinctrl *p);
extern struct pinctrl_state * __must_check pinctrl_lookup_state(
struct pinctrl *p,
const char *name);
extern int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *s);
#else /* !CONFIG_PINCTRL */
@@ -52,7 +57,7 @@ static inline int pinctrl_gpio_direction_output(unsigned gpio)
return 0;
}
static inline struct pinctrl * __must_check pinctrl_get(struct device *dev, const char *name)
static inline struct pinctrl * __must_check pinctrl_get(struct device *dev)
{
return NULL;
}
@@ -61,16 +66,52 @@ static inline void pinctrl_put(struct pinctrl *p)
{
}
static inline int pinctrl_enable(struct pinctrl *p)
static inline struct pinctrl_state * __must_check pinctrl_lookup_state(
struct pinctrl *p,
const char *name)
{
return NULL;
}
static inline int pinctrl_select_state(struct pinctrl *p,
struct pinctrl_state *s)
{
return 0;
}
static inline void pinctrl_disable(struct pinctrl *p)
#endif /* CONFIG_PINCTRL */
static inline struct pinctrl * __must_check pinctrl_get_select(
struct device *dev, const char *name)
{
struct pinctrl *p;
struct pinctrl_state *s;
int ret;
p = pinctrl_get(dev);
if (IS_ERR(p))
return p;
s = pinctrl_lookup_state(p, name);
if (IS_ERR(s)) {
pinctrl_put(p);
return ERR_PTR(PTR_ERR(s));
}
ret = pinctrl_select_state(p, s);
if (ret < 0) {
pinctrl_put(p);
return ERR_PTR(ret);
}
return p;
}
#endif /* CONFIG_PINCTRL */
static inline struct pinctrl * __must_check pinctrl_get_select_default(
struct device *dev)
{
return pinctrl_get_select(dev, PINCTRL_STATE_DEFAULT);
}
#ifdef CONFIG_PINCONF