i2c: add Tegra186 BPMP driver

On Tegra186, some I2C controllers are directly controlled by the main CPU,
whereas others are controlled by the BPMP, and can only be accessed by the
main CPU via IPC requests to the BPMP. This driver covers the latter case.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index b3e8405..67ebec7 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -161,6 +161,16 @@
 	  Support for Marvell I2C controllers as used on the orion5x and
 	  kirkwood SoC families.
 
+config TEGRA186_BPMP_I2C
+	bool "Enable Tegra186 BPMP-based I2C driver"
+	depends on TEGRA186_BPMP
+	help
+	  Support for Tegra I2C controllers managed by the BPMP (Boot and
+	  Power Management Processor). On Tegra186, some I2C controllers are
+	  directly controlled by the main CPU, whereas others are controlled
+	  by the BPMP, and can only be accessed by the main CPU via IPC
+	  requests to the BPMP. This driver covers the latter case.
+
 source "drivers/i2c/muxes/Kconfig"
 
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