[S] Change in coreboot[master]: mb/siemens/mc_ehl2/devicetree.cb: Use RV3028 bus_speed instead of dum...

[Jan Samek (Code Review)]

Jan Samek has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/69544 )

Change subject: mb/siemens/mc_ehl2/devicetree.cb: Use RV3028 bus_speed instead of dummy i2c device
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mb/siemens/mc_ehl2/devicetree.cb: Use RV3028 bus_speed instead of dummy i2c device

Instead of creating a dummy I2C device in order to force Linux to decrease the
I2C bus speed, use the own 'bus_speed' field of RV3028 device config structure.

Linux should always set the bus speed to the speed of the slowest device sitting
on the bus. Hence the dummy device is not needed here anymore.

BUG=none
TEST=See if the RV3028 RTC is visible and working (date/time can be set/read) in
Linux.

Change-Id: I6e269dc67d1fe2a6747fcf3bee224def7b553f08
Signed-off-by: Jan Samek 
---
M src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
1 file changed, 21 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/69544/1

diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
index 3b54f24..4dd062c 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
@@ -147,6 +147,7 @@
    	device pci 15.1 on	    # I2C1
    		# Enable external RTC chip
    		chip drivers/i2c/rv3028c7
+				register "bus_speed" = "I2C_SPEED_STANDARD"
    			register "set_user_date" = "1"
    			register "user_year" = "04"
    			register "user_month" = "07"
@@ -156,12 +157,6 @@
    			register "cap_charge" = "CHARGE_OFF"
    			device i2c 0x52 on end  # RTC RV3028-C7
    		end
-			# Add dummy I2C device to limit BUS speed to 100 kHz in OS
-			chip drivers/i2c/generic
-				register "hid" = ""PRP0001""
-				register "speed" = "I2C_SPEED_STANDARD"
-				device i2c 0x7f on end
-			end
    	end
    	device pci 15.2 on	    # I2C2
    	# Add dummy I2C device to limit BUS speed to 100 kHz in OS