power domain: add Tegra186 driver

In Tegra186, SoC power domains are manipulated using IPC requests to
the BPMP (Boot and Power Management Processor). This change implements a
driver that does that.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index b904097..132e332 100644
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -17,4 +17,11 @@
 	  simply accepts requests to power on/off various HW modules without
 	  actually doing anything beyond a little error checking.
 
+config TEGRA186_POWER_DOMAIN
+	bool "Enable Tegra186 BPMP-based power domain driver"
+	depends on TEGRA186_BPMP
+	help
+	  Enable support for manipulating Tegra's on-SoC power domains via IPC
+	  requests to the BPMP (Boot and Power Management Processor).
+
 endmenu