power: sequencing: Add an API to return the pwrseq device's 'dev' pointer

The consumer drivers can make use of the pwrseq device's 'dev' pointer to
query the pwrseq provider's DT node to check for existence of specific
properties.

Hence, add an API to return the pwrseq device's 'dev' pointer to consumers.

Note that since pwrseq_get() would've increased the pwrseq refcount, there
is no need to increase the refcount in this API again.

Tested-by: Wei Deng <wei.deng@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Link: https://patch.msgid.link/20260519-pwrseq-m2-bt-v3-6-b39dc2ae3966@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

diff --git a/drivers/power/sequencing/core.c b/drivers/power/sequencing/core.c
index 14335c4f813ed1f117e77339bb53bff3929ed17d..89694092981f76d750ca399d59a65c7e89d52051 100644 (file)
--- a/drivers/power/sequencing/core.c
+++ b/drivers/power/sequencing/core.c
@@ -965,6 +965,29 @@ int pwrseq_power_off(struct pwrseq_desc *desc)
 }
 EXPORT_SYMBOL_GPL(pwrseq_power_off);
 
+/**
+ * pwrseq_to_device() - Get the pwrseq device pointer from a descriptor.
+ * @desc: Descriptor referencing the power sequencer.
+ *
+ * Return the 'dev' pointer of the power sequencer device associated with @desc.
+ * Consumer drivers can use this to query the pwrseq provider's device tree
+ * node, for example to check for the existence of specific properties.
+ *
+ * Since pwrseq_get() already takes a reference to the pwrseq device, this
+ * function does not take an additional reference.
+ *
+ * Returns:
+ * Pointer to the pwrseq struct device, or NULL if @desc is NULL.
+ */
+struct device *pwrseq_to_device(struct pwrseq_desc *desc)
+{
+       if (!desc)
+               return NULL;
+
+       return &desc->pwrseq->dev;
+}
+EXPORT_SYMBOL_GPL(pwrseq_to_device);
+
 #if IS_ENABLED(CONFIG_DEBUG_FS)
 
 struct pwrseq_debugfs_count_ctx {

diff --git a/include/linux/pwrseq/consumer.h b/include/linux/pwrseq/consumer.h
index 7d583b4f266e625fa61a8a424a9dfbca7aab1603..3c907c9e1885dc2958043a9a733fbe20bdf95f6e 100644 (file)
--- a/include/linux/pwrseq/consumer.h
+++ b/include/linux/pwrseq/consumer.h
@@ -23,6 +23,8 @@ devm_pwrseq_get(struct device *dev, const char *target);
 int pwrseq_power_on(struct pwrseq_desc *desc);
 int pwrseq_power_off(struct pwrseq_desc *desc);
 
+struct device *pwrseq_to_device(struct pwrseq_desc *desc);
+
 #else /* CONFIG_POWER_SEQUENCING */
 
 static inline struct pwrseq_desc * __must_check
@@ -51,6 +53,11 @@ static inline int pwrseq_power_off(struct pwrseq_desc *desc)
        return -ENOSYS;
 }
 
+static inline struct device *pwrseq_to_device(struct pwrseq_desc *desc)
+{
+       return NULL;
+}
+
 #endif /* CONFIG_POWER_SEQUENCING */
 
 #endif /* __POWER_SEQUENCING_CONSUMER_H__ */