Merge tag 'pwrseq-is-controllable-for-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into pwrseq/for-next

Add a new core power sequencing consumer functions:
pwrseq_is_controllable(). This allows users to check whether the
sequencer's target is actually host-controllable.

2 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/pwrseq/consumer.h b/include/linux/pwrseq/consumer.h
index 16fad5f3e3ab..b69117ad3fa7 100644
--- a/include/linux/pwrseq/consumer.h
+++ b/include/linux/pwrseq/consumer.h
@@ -25,6 +25,8 @@ int pwrseq_disable(struct pwrseq_desc *desc);
 
 struct device *pwrseq_to_device(struct pwrseq_desc *desc);
 
+bool pwrseq_is_controllable(struct pwrseq_desc *desc);
+
 #else /* CONFIG_POWER_SEQUENCING */
 
 static inline struct pwrseq_desc * __must_check
@@ -58,6 +60,11 @@ static inline struct device *pwrseq_to_device(struct pwrseq_desc *desc)
 	return NULL;
 }
 
+static inline bool pwrseq_is_controllable(struct pwrseq_desc *desc)
+{
+	return false;
+}
+
 #endif /* CONFIG_POWER_SEQUENCING */
 
 #endif /* __POWER_SEQUENCING_CONSUMER_H__ */
diff --git a/include/linux/pwrseq/provider.h b/include/linux/pwrseq/provider.h
index 33b3d2c2e39d..7285ad94a221 100644
--- a/include/linux/pwrseq/provider.h
+++ b/include/linux/pwrseq/provider.h
@@ -6,12 +6,15 @@
 #ifndef __POWER_SEQUENCING_PROVIDER_H__
 #define __POWER_SEQUENCING_PROVIDER_H__
 
+#include <linux/types.h>
+
 struct device;
 struct module;
 struct pwrseq_device;
 
 typedef int (*pwrseq_power_state_func)(struct pwrseq_device *);
 typedef int (*pwrseq_match_func)(struct pwrseq_device *, struct device *);
+typedef bool (*pwrseq_is_controllable_func)(struct pwrseq_device *);
 
 #define PWRSEQ_NO_MATCH 0
 #define PWRSEQ_MATCH_OK 1
@@ -43,11 +46,16 @@ struct pwrseq_unit_data {
  *               the state lock has been released. It's useful for implementing
  *               boot-up delays without blocking other users from powering up
  *               using the same power sequencer.
+ * @is_controllable: Optional callback checking whether enabling/disabling this
+ *                   target actually controls power (for example when the
+ *                   controlling GPIO is wired up). If not provided, the
+ *                   target's power is assumed to be always controllable.
  */
 struct pwrseq_target_data {
 	const char *name;
 	const struct pwrseq_unit_data *unit;
 	pwrseq_power_state_func post_enable;
+	pwrseq_is_controllable_func is_controllable;
 };
 
 /**