cdx: add support for bus enable and disable

CDX bus needs to be disabled before updating/writing devices
in the FPGA. Once the devices are written, the bus shall be
rescanned. This change provides sysfs entry to enable/disable the
CDX bus.

Co-developed-by: Nipun Gupta <[email protected]>
Signed-off-by: Nipun Gupta <[email protected]>
Signed-off-by: Abhijit Gangurde <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/cdx/controller/cdx_controller.c b/drivers/cdx/controller/cdx_controller.c
index b4e0d6b40339..f2a691efd1f1 100644
--- a/drivers/cdx/controller/cdx_controller.c
+++ b/drivers/cdx/controller/cdx_controller.c
@@ -33,6 +33,16 @@ static const struct cdx_mcdi_ops mcdi_ops = {
 	.mcdi_request = cdx_mcdi_request,
 };
 
+static int cdx_bus_enable(struct cdx_controller *cdx, u8 bus_num)
+{
+	return cdx_mcdi_bus_enable(cdx->priv, bus_num);
+}
+
+static int cdx_bus_disable(struct cdx_controller *cdx, u8 bus_num)
+{
+	return cdx_mcdi_bus_disable(cdx->priv, bus_num);
+}
+
 void cdx_rpmsg_post_probe(struct cdx_controller *cdx)
 {
 	/* Register CDX controller with CDX bus driver */
@@ -128,6 +138,8 @@ static int cdx_scan_devices(struct cdx_controller *cdx)
 }
 
 static struct cdx_ops cdx_ops = {
+	.bus_enable		= cdx_bus_enable,
+	.bus_disable	= cdx_bus_disable,
 	.scan		= cdx_scan_devices,
 	.dev_configure	= cdx_configure_device,
 };