Introduce the rescan attribute as a device attribute to
synchronize the fsl-mc bus objects and the MC firmware.

To rescan the root dprc only, e.g.
echo 1 > /sys/bus/fsl-mc/devices/dprc.1/rescan

Signed-off-by: Ioana Ciornei <ioana.cior...@nxp.com>
---
 drivers/bus/fsl-mc/dprc-driver.c    |  4 ++--
 drivers/bus/fsl-mc/fsl-mc-bus.c     | 28 ++++++++++++++++++++++++++++
 drivers/bus/fsl-mc/fsl-mc-private.h |  3 +++
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index 52c7e15..be80e3a 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -214,8 +214,8 @@ static void dprc_add_new_devices(struct fsl_mc_device 
*mc_bus_dev,
  * populated before they can get allocation requests from probe callbacks
  * of the device drivers for the non-allocatable devices.
  */
-static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
-                            unsigned int *total_irq_count)
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+                     unsigned int *total_irq_count)
 {
        int num_child_objects;
        int dprc_get_obj_failures;
diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 240b99d..763cbeb 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -137,8 +137,36 @@ static ssize_t modalias_show(struct device *dev, struct 
device_attribute *attr,
 }
 static DEVICE_ATTR_RO(modalias);
 
+static ssize_t rescan_store(struct device *dev,
+                           struct device_attribute *attr,
+                           const char *buf, size_t count)
+{
+       struct fsl_mc_device *root_mc_dev;
+       struct fsl_mc_bus *root_mc_bus;
+       unsigned long val;
+
+       if (!fsl_mc_is_root_dprc(dev))
+               return -EINVAL;
+
+       root_mc_dev = to_fsl_mc_device(dev);
+       root_mc_bus = to_fsl_mc_bus(root_mc_dev);
+
+       if (kstrtoul(buf, 0, &val) < 0)
+               return -EINVAL;
+
+       if (val) {
+               mutex_lock(&root_mc_bus->scan_mutex);
+               dprc_scan_objects(root_mc_dev, NULL);
+               mutex_unlock(&root_mc_bus->scan_mutex);
+       }
+
+       return count;
+}
+static DEVICE_ATTR_WO(rescan);
+
 static struct attribute *fsl_mc_dev_attrs[] = {
        &dev_attr_modalias.attr,
+       &dev_attr_rescan.attr,
        NULL,
 };
 
diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h 
b/drivers/bus/fsl-mc/fsl-mc-private.h
index d6f67a8..8a244aa 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -464,6 +464,9 @@ int __must_check fsl_mc_device_add(struct fsl_mc_obj_desc 
*obj_desc,
 
 void dprc_driver_exit(void);
 
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+                     unsigned int *total_irq_count);
+
 int __init fsl_mc_allocator_driver_init(void);
 
 void fsl_mc_allocator_driver_exit(void);
-- 
1.9.1

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