pwm: Add pwm_can_sleep() as exported API to users
Calls to some external PWM chips can sleep. To help users,
add pwm_can_sleep() API.
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 6d661f3..3fef477 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -146,6 +146,8 @@
* @base: number of first PWM controlled by this chip
* @npwm: number of PWMs controlled by this chip
* @pwms: array of PWM devices allocated by the framework
+ * @can_sleep: must be true if the .config(), .enable() or .disable()
+ * operations may sleep
*/
struct pwm_chip {
struct device *dev;
@@ -159,6 +161,7 @@
struct pwm_device * (*of_xlate)(struct pwm_chip *pc,
const struct of_phandle_args *args);
unsigned int of_pwm_n_cells;
+ bool can_sleep;
};
#if IS_ENABLED(CONFIG_PWM)
@@ -179,6 +182,8 @@
struct pwm_device *devm_pwm_get(struct device *dev, const char *consumer);
void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
+
+bool pwm_can_sleep(struct pwm_device *pwm);
#else
static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
{
@@ -226,6 +231,11 @@
static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
{
}
+
+static inline bool pwm_can_sleep(struct pwm_device *pwm)
+{
+ return false;
+}
#endif
struct pwm_lookup {