bus: uniphier-system-bus: add UniPhier System Bus driver
Since commit 1517126fdac2 ("ARM: uniphier: select DM_ETH"), DM-based
drivers/net/smc911x.c is compiled, but it is never probed because the
parent node lacks the DM-based driver.
I need a skeleton driver to populate child devices (but the next commit
will move more hardware settings to the this driver).
I put this to drivers/bus/uniphier-system-bus.c because this is the
same path as the driver in Linux kernel.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
new file mode 100644
index 0000000..07a33c6
--- /dev/null
+++ b/drivers/bus/Kconfig
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Bus Devices
+#
+
+menu "Bus devices"
+
+config UNIPHIER_SYSTEM_BUS
+ bool "UniPhier System Bus driver"
+ depends on ARCH_UNIPHIER
+ default y
+ help
+ Support for UniPhier System Bus, a simple external bus. This is
+ needed to use on-board devices connected to UniPhier SoCs.
+
+endmenu
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
new file mode 100644
index 0000000..0b97fc1
--- /dev/null
+++ b/drivers/bus/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the bus drivers.
+#
+
+obj-$(CONFIG_UNIPHIER_SYSTEM_BUS) += uniphier-system-bus.o
diff --git a/drivers/bus/uniphier-system-bus.c b/drivers/bus/uniphier-system-bus.c
new file mode 100644
index 0000000..c61d795
--- /dev/null
+++ b/drivers/bus/uniphier-system-bus.c
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <dm.h>
+
+static const struct udevice_id uniphier_system_bus_match[] = {
+ { .compatible = "socionext,uniphier-system-bus" },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(uniphier_system_bus_driver) = {
+ .name = "uniphier-system-bus",
+ .id = UCLASS_SIMPLE_BUS,
+ .of_match = uniphier_system_bus_match,
+};