[PATCH v8 1/9] spmi: add a helper to look up an SPMI device from a device node

[Caleb Connolly <caleb.connolly@linaro.org>]

The helper function spmi_device_from_of() takes a device node and
returns the SPMI device associated with it.
This is like of_find_device_by_node but for SPMI devices.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
---
 drivers/spmi/spmi.c  | 17 +++++++++++++++++
 include/linux/spmi.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
index b37ead9e2fad..de550b777451 100644
--- a/drivers/spmi/spmi.c
+++ b/drivers/spmi/spmi.c
@@ -386,6 +386,23 @@ static struct bus_type spmi_bus_type = {
 	.uevent		= spmi_drv_uevent,
 };
 
+/**
+ * spmi_device_from_of() - get the associated SPMI device from a device node
+ *
+ * @np:		device node
+ *
+ * Returns the struct spmi_device associated with a device node or NULL.
+ */
+inline struct spmi_device *spmi_device_from_of(struct device_node *np)
+{
+	struct device *dev = bus_find_device_by_of_node(&spmi_bus_type, np);
+
+	if (dev)
+		return to_spmi_device(dev);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(spmi_device_from_of);
+
 /**
  * spmi_controller_alloc() - Allocate a new SPMI device
  * @ctrl:	associated controller
diff --git a/include/linux/spmi.h b/include/linux/spmi.h
index 729bcbf9f5ad..6ee476bc1cd6 100644
--- a/include/linux/spmi.h
+++ b/include/linux/spmi.h
@@ -7,6 +7,7 @@
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
+#include <linux/of.h>
 
 /* Maximum slave identifier */
 #define SPMI_MAX_SLAVE_ID		16
@@ -164,6 +165,7 @@ static inline void spmi_driver_unregister(struct spmi_driver *sdrv)
 	module_driver(__spmi_driver, spmi_driver_register, \
 			spmi_driver_unregister)
 
+inline struct spmi_device *spmi_device_from_of(struct device_node *np);
 int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf);
 int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf,
 			   size_t len);
-- 
2.35.1