1 files changed, 106 insertions, 2 deletions

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 21d076c5089e..112b31436848 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -1,11 +1,13 @@
 #ifndef __LINUX_PWM_H
 #define __LINUX_PWM_H
 
+#include <linux/err.h>
 #include <linux/of.h>
 
 struct pwm_device;
 struct seq_file;
 
+#if IS_ENABLED(CONFIG_PWM) || IS_ENABLED(CONFIG_HAVE_PWM)
 /*
  * pwm_request - request a PWM device
  */
@@ -30,10 +32,47 @@ int pwm_enable(struct pwm_device *pwm);
  * pwm_disable - stop a PWM output toggling
  */
 void pwm_disable(struct pwm_device *pwm);
+#else
+static inline struct pwm_device *pwm_request(int pwm_id, const char *label)
+{
+        return ERR_PTR(-ENODEV);
+}
+
+static inline void pwm_free(struct pwm_device *pwm)
+{
+}
+
+static inline int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+        return -EINVAL;
+}
+
+static inline int pwm_enable(struct pwm_device *pwm)
+{
+        return -EINVAL;
+}
+
+static inline void pwm_disable(struct pwm_device *pwm)
+{
+}
+#endif
 
-#ifdef CONFIG_PWM
 struct pwm_chip;
 
+/**
+ * enum pwm_polarity - polarity of a PWM signal
+ * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty-
+ * cycle, followed by a low signal for the remainder of the pulse
+ * period
+ * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty-
+ * cycle, followed by a high signal for the remainder of the pulse
+ * period
+ */
+enum pwm_polarity {
+        PWM_POLARITY_NORMAL,
+        PWM_POLARITY_INVERSED,
+};
+
 enum {
         PWMF_REQUESTED = 1 << 0,
         PWMF_ENABLED = 1 << 1,
@@ -61,11 +100,17 @@ static inline unsigned int pwm_get_period(struct pwm_device *pwm)
         return pwm ? pwm->period : 0;
 }
 
+/*
+ * pwm_set_polarity - configure the polarity of a PWM signal
+ */
+int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity);
+
 /**
  * struct pwm_ops - PWM controller operations
  * @request: optional hook for requesting a PWM
  * @free: optional hook for freeing a PWM
  * @config: configure duty cycles and period length for this PWM
+ * @set_polarity: configure the polarity of this PWM
  * @enable: enable PWM output toggling
  * @disable: disable PWM output toggling
  * @dbg_show: optional routine to show contents in debugfs
@@ -79,6 +124,9 @@ struct pwm_ops {
         int                     (*config)(struct pwm_chip *chip,
                                           struct pwm_device *pwm,
                                           int duty_ns, int period_ns);
+        int                     (*set_polarity)(struct pwm_chip *chip,
+                                          struct pwm_device *pwm,
+                                          enum pwm_polarity polarity);
         int                     (*enable)(struct pwm_chip *chip,
                                           struct pwm_device *pwm);
         void                    (*disable)(struct pwm_chip *chip,
@@ -113,6 +161,7 @@ struct pwm_chip {
         unsigned int            of_pwm_n_cells;
 };
 
+#if IS_ENABLED(CONFIG_PWM)
 int pwm_set_chip_data(struct pwm_device *pwm, void *data);
 void *pwm_get_chip_data(struct pwm_device *pwm);
 
@@ -125,6 +174,57 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
 struct pwm_device *pwm_get(struct device *dev, const char *consumer);
 void pwm_put(struct pwm_device *pwm);
 
+struct pwm_device *devm_pwm_get(struct device *dev, const char *consumer);
+void devm_pwm_put(struct device *dev, struct pwm_device *pwm);
+#else
+static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
+{
+        return -EINVAL;
+}
+
+static inline void *pwm_get_chip_data(struct pwm_device *pwm)
+{
+        return NULL;
+}
+
+static inline int pwmchip_add(struct pwm_chip *chip)
+{
+        return -EINVAL;
+}
+
+static inline int pwmchip_remove(struct pwm_chip *chip)
+{
+        return -EINVAL;
+}
+
+static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
+                                                       unsigned int index,
+                                                       const char *label)
+{
+        return ERR_PTR(-ENODEV);
+}
+
+static inline struct pwm_device *pwm_get(struct device *dev,
+                                         const char *consumer)
+{
+        return ERR_PTR(-ENODEV);
+}
+
+static inline void pwm_put(struct pwm_device *pwm)
+{
+}
+
+static inline struct pwm_device *devm_pwm_get(struct device *dev,
+                                              const char *consumer)
+{
+        return ERR_PTR(-ENODEV);
+}
+
+static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm)
+{
+}
+#endif
+
 struct pwm_lookup {
         struct list_head list;
         const char *provider;
@@ -141,8 +241,12 @@ struct pwm_lookup {
                 .con_id = _con_id,                      \
         }
 
+#if IS_ENABLED(CONFIG_PWM)
 void pwm_add_table(struct pwm_lookup *table, size_t num);
-
+#else
+static inline void pwm_add_table(struct pwm_lookup *table, size_t num)
+{
+}
 #endif
 
 #endif /* __LINUX_PWM_H */