[PATCH 2/7] driver: Add rescan hook to struct device

[Sascha Hauer <s.hauer@pengutronix.de>]

When devices are enabled with a device tree overlay the newly enabled
devices can be probed by doing a of_probe(). This works fine for the
regular platform devices, but doesn't work for devices which are not
probed by the core, but by the subsystem. Prominent examples are I2C or
SPI devices.

This patch adds a struct device::rescan hook that subsystems can
implement to trigger rescanning the device nodes.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/of/platform.c | 5 ++++-
 include/driver.h      | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index edb082b106..e688075f16 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -153,8 +153,11 @@ struct device *of_platform_device_create(struct device_node *np,
 	 * Linux uses the OF_POPULATED flag to skip already populated/created
 	 * devices.
 	 */
-	if (np->dev)
+	if (np->dev) {
+		if (np->dev->rescan)
+			np->dev->rescan(np->dev);
 		return np->dev;
+	}
 
 	/* count the io resources */
 	if (of_can_translate_address(np))
diff --git a/include/driver.h b/include/driver.h
index f53668711b..205f232753 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -91,6 +91,7 @@ struct device {
 	 * when the driver should actually detect client devices
 	 */
 	int     (*detect) (struct device *);
+	int	(*rescan) (struct device *);
 
 	/*
 	 * if a driver probe is deferred, this stores the last error
-- 
2.30.2