bus: fsl-mc: add autorescan sysfs

Add the autorescan sysfs in order to enable/disable the DPRC IRQs on
which automatic rescan of the bus is performed. This is important when
dynamic creation of objects is needed to happen in a timely manner because
object creation can be bundled together.

Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20210114170752.2927915-6-ciorneiioana@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index ee3e6252ffc3..70f4b69556f5 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -241,8 +241,63 @@ static ssize_t rescan_store(struct bus_type *bus,
 }
 static BUS_ATTR_WO(rescan);
 
+static int fsl_mc_bus_set_autorescan(struct device *dev, void *data)
+{
+	struct fsl_mc_device *root_mc_dev;
+	unsigned long val;
+	char *buf = data;
+
+	if (!fsl_mc_is_root_dprc(dev))
+		goto exit;
+
+	root_mc_dev = to_fsl_mc_device(dev);
+
+	if (kstrtoul(buf, 0, &val) < 0)
+		return -EINVAL;
+
+	if (val)
+		enable_dprc_irq(root_mc_dev);
+	else
+		disable_dprc_irq(root_mc_dev);
+
+exit:
+	return 0;
+}
+
+static int fsl_mc_bus_get_autorescan(struct device *dev, void *data)
+{
+	struct fsl_mc_device *root_mc_dev;
+	char *buf = data;
+
+	if (!fsl_mc_is_root_dprc(dev))
+		goto exit;
+
+	root_mc_dev = to_fsl_mc_device(dev);
+
+	sprintf(buf, "%d\n", get_dprc_irq_state(root_mc_dev));
+exit:
+	return 0;
+}
+
+static ssize_t autorescan_store(struct bus_type *bus,
+				const char *buf, size_t count)
+{
+	bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_set_autorescan);
+
+	return count;
+}
+
+static ssize_t autorescan_show(struct bus_type *bus, char *buf)
+{
+	bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_get_autorescan);
+	return strlen(buf);
+}
+
+static BUS_ATTR_RW(autorescan);
+
 static struct attribute *fsl_mc_bus_attrs[] = {
 	&bus_attr_rescan.attr,
+	&bus_attr_autorescan.attr,
 	NULL,
 };