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pwm: Add table-based lookup for static mappings

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In order to get rid of the global namespace for PWM devices, this commit
provides an alternative method, similar to that of the regulator or
clock frameworks, for registering a static mapping for PWM devices. This
works by providing a table with a provider/consumer map in the board
setup code.

With the new pwm_get() and pwm_put() functions available, usage of
pwm_request() and pwm_free() becomes deprecated.

Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
This commit is contained in:
Thierry Reding 2012-03-26 08:42:48 +02:00
parent 62099abf67
commit 8138d2ddbc
3 changed files with 199 additions and 19 deletions
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22
include/linux/pwm.h
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@ -115,6 +115,28 @@ int pwmchip_remove(struct pwm_chip *chip);
struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
unsigned int index,
const char *label);
struct pwm_device *pwm_get(struct device *dev, const char *consumer);
void pwm_put(struct pwm_device *pwm);
struct pwm_lookup {
struct list_head list;
const char *provider;
unsigned int index;
const char *dev_id;
const char *con_id;
};
#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id) \
{ \
.provider = _provider, \
.index = _index, \
.dev_id = _dev_id, \
.con_id = _con_id, \
}
void pwm_add_table(struct pwm_lookup *table, size_t num);
#endif
#endif /* __LINUX_PWM_H */