On SLIMBus controllers like Qcom NGD(non ported device), controller
can request logical address once the remote side is powered, having a
helper function like this to explicitly enumerate the bus is helpful.
Also codec drivers which are taking to interface device would need
such a helper too.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
drivers/slimbus/core.c | 39 +++++++++++++++++++++++++++++++++++++++
include/linux/slimbus.h | 2 ++
2 files changed, 41 insertions(+)
diff --git a/drivers/slimbus/core.c b/drivers/slimbus/core.c
index 7ddfc675b131..88248a4ecad9 100644
--- a/drivers/slimbus/core.c
+++ b/drivers/slimbus/core.c
@@ -356,6 +356,45 @@ struct slim_device *slim_get_device(struct slim_controller *ctrl,
}
EXPORT_SYMBOL_GPL(slim_get_device);
+static int of_slim_match_dev(struct device *dev, void *data)
+{
+ struct device_node *np = data;
+ struct slim_device *sbdev = to_slim_device(dev);
+
+ return (sbdev->dev.of_node == np);
+}
+
+static struct slim_device *of_find_slim_device(struct slim_controller *ctrl,
+ struct device_node *np)
+{
+ struct slim_device *sbdev;
+ struct device *dev;
+
+ dev = device_find_child(ctrl->dev, np, of_slim_match_dev);
+ if (dev) {
+ sbdev = to_slim_device(dev);
+ return sbdev;
+ }
+
+ return NULL;
+}
+
+/**
+ * of_slim_get_device() - get handle to a device using dt node.
+ *
+ * @ctrl: Controller on which this device will be added/queried
+ * @np: node pointer to device
+ *
+ * Return: pointer to a device if it has already reported. Creates a new
+ * device and returns pointer to it if the device has not yet enumerated.
+ */
+struct slim_device *of_slim_get_device(struct slim_controller *ctrl,
+ struct device_node *np)
+{
+ return of_find_slim_device(ctrl, np);
+}
+EXPORT_SYMBOL_GPL(of_slim_get_device);
+
static int slim_device_alloc_laddr(struct slim_device *sbdev,
bool report_present)
{
diff --git a/include/linux/slimbus.h b/include/linux/slimbus.h
index c36cf121d2cd..efa36a852dc3 100644
--- a/include/linux/slimbus.h
+++ b/include/linux/slimbus.h
@@ -138,6 +138,8 @@ static inline void slim_set_devicedata(struct slim_device *dev, void *data)
dev_set_drvdata(&dev->dev, data);
}
+struct slim_device *of_slim_get_device(struct slim_controller *ctrl,
+ struct device_node *np);
struct slim_device *slim_get_device(struct slim_controller *ctrl,
struct slim_eaddr *e_addr);
int slim_get_logical_addr(struct slim_device *sbdev);
--
2.16.2
--
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