mailbox: implement a sandbox test
This adds a sandbox mailbox implementation (provider), a test client
device, instantiates them both from Sandbox's DT, and adds a DM test
that excercises everything.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org> # v1
diff --git a/test/dm/Makefile b/test/dm/Makefile
index fd781e8..9eaf04b 100644
--- a/test/dm/Makefile
+++ b/test/dm/Makefile
@@ -21,6 +21,7 @@
obj-$(CONFIG_DM_GPIO) += gpio.o
obj-$(CONFIG_DM_I2C) += i2c.o
obj-$(CONFIG_LED) += led.o
+obj-$(CONFIG_DM_MAILBOX) += mailbox.o
obj-$(CONFIG_DM_MMC) += mmc.o
obj-$(CONFIG_DM_PCI) += pci.o
obj-$(CONFIG_RAM) += ram.o