Change in coreboot[master]: siemens/mc_bdx1: Enable PCA9538 I/O expander

[Werner Zeh (Code Review)]

Werner Zeh has uploaded this change for review. ( https://review.coreboot.org/23749

Change subject: siemens/mc_bdx1: Enable PCA9538 I/O expander
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siemens/mc_bdx1: Enable PCA9538 I/O expander

The I/O expander on the mc_bdx1 is used to get the hardware version of
the mainboard. This patch enables the chip driver for the I/O expander.

Change-Id: I98c667fe4dccf0698ab4cb5ede6082f020c70ec6
Signed-off-by: Werner Zeh 
---
M src/mainboard/siemens/mc_bdx1/Kconfig
M src/mainboard/siemens/mc_bdx1/devicetree.cb
2 files changed, 8 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/49/23749/1

diff --git a/src/mainboard/siemens/mc_bdx1/Kconfig b/src/mainboard/siemens/mc_bdx1/Kconfig
index dc2093d..a24d09d 100644
--- a/src/mainboard/siemens/mc_bdx1/Kconfig
+++ b/src/mainboard/siemens/mc_bdx1/Kconfig
@@ -13,6 +13,7 @@
    select DRIVER_INTEL_I210
    select DRIVER_SIEMENS_NC_FPGA
    select DRIVERS_I2C_RX6110SA
+	select DRIVERS_I2C_PCA9538

config MAINBOARD_DIR
    string
diff --git a/src/mainboard/siemens/mc_bdx1/devicetree.cb b/src/mainboard/siemens/mc_bdx1/devicetree.cb
index 8bb582e..bb5d843 100644
--- a/src/mainboard/siemens/mc_bdx1/devicetree.cb
+++ b/src/mainboard/siemens/mc_bdx1/devicetree.cb
@@ -23,6 +23,13 @@
    			register "user_weekday" = "4"
    			device i2c 0x32 on end	# RTC RX6110 SA
    		end
+			#Enable I/O expander
+			chip drivers/i2c/pca9538
+				register "in_out" = "0xff"
+				register "invert" = "0xff"
+				register "out_val" = "0x00"
+				device i2c 0x71 on end # I/O expander
+			end
    	end # SMBus Controller
    	device pci 1f.5 on end # SATA Controller
    end