[PATCH v2 2/2] drivers: bus: simple-pm-bus: Add support for probing simple bus only devices

[Saravana Kannan <saravanak@google.com>]

The OF platform code sets up simple bus only devices (i.e. devices that
won't match with any other driver) to get probed by the simple-pm-bus to
keep fw_devlink from blocking probe() or sync_state() [1] callbacks of
other devices. There's no need to populate the child devices since the
OF platform code would do that anyway, so return early for these simple
bus only devices.

[1] - https://lore.kernel.org/lkml/CAPDyKFo9Bxremkb1dDrr4OcXSpE0keVze94Cm=zrkOVxHHxBmQ@mail.gmail.com/
Signed-off-by: Saravana Kannan <saravanak@google.com>
Tested-by: Saravana Kannan <saravanak@google.com>
---
 drivers/bus/simple-pm-bus.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c
index 01a3d0cd08ed..91d52021b7f9 100644
--- a/drivers/bus/simple-pm-bus.c
+++ b/drivers/bus/simple-pm-bus.c
@@ -19,6 +19,13 @@ static int simple_pm_bus_probe(struct platform_device *pdev)
 	const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
 	struct device_node *np = pdev->dev.of_node;
 
+	/*
+	 * These are transparent bus devices (not simple-pm-bus matches) that
+	 * get populated automatically.  So, don't need to do anything more.
+	 */
+	if (pdev->driver_override)
+		return 0;
+
 	dev_dbg(&pdev->dev, "%s\n", __func__);
 
 	pm_runtime_enable(&pdev->dev);
-- 
2.33.0.153.gba50c8fa24-goog