[S] Change in coreboot[master]: mb/siemens/mc_ehl2: Set RGMII output impedance manually

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/73019 )

(

1 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: mb/siemens/mc_ehl2: Set RGMII output impedance manually
......................................................................

mb/siemens/mc_ehl2: Set RGMII output impedance manually

Measurements have shown that the automatic calibrated values for RGMII
output impedances are too low. For this reason, set the PMOS value to 16
and the NMOS to 13.

Change-Id: Ic3382889d3281faccb03819f9680a9763703b2a1
Signed-off-by: Mario Scheithauer 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73019
Reviewed-by: Werner Zeh 
Tested-by: build bot (Jenkins) 
---
M src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
1 file changed, 23 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Werner Zeh: Looks good to me, approved

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 758c8b1..f14c225 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
@@ -191,6 +191,9 @@
    			# INTn is routed to LED[2] pin
    			register "enable_int" = "true"
    			register "downshift_cnt" = "2"
+				register "force_mos" = "true"
+				register "pmos_val" = "0xF"
+				register "nmos_val" = "0xA"
    			device mdio 0 on    # PHY address
    				ops m88e1512_ops
    			end
@@ -207,6 +210,9 @@
    			# INTn is routed to LED[2] pin
    			register "enable_int" = "true"
    			register "downshift_cnt" = "2"
+				register "force_mos" = "true"
+				register "pmos_val" = "0xF"
+				register "nmos_val" = "0xA"
    			device mdio 1 on    # PHY address
    				ops m88e1512_ops
    			end