[S] Change in coreboot[main]: mb/google/brya/var/trulo: Add eMMC descriptions

[Subrata Banik (Code Review)]

Subrata Banik has submitted this change. ( https://review.coreboot.org/c/coreboot/+/83552?usp=email )

Change subject: mb/google/brya/var/trulo: Add eMMC descriptions
......................................................................

mb/google/brya/var/trulo: Add eMMC descriptions

This patch adds descriptions for eMMC device (supported mode and DLL
tuning) to the device tree.

BUG=b:351976770
TEST=Builds successfully for google/trulo.

Change-Id: I8f1310313b8114731aa417610f245f94c8978ac0
Signed-off-by: Subrata Banik 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83552
Tested-by: build bot (Jenkins) 
Reviewed-by: Eric Lai 
---
M src/mainboard/google/brya/variants/trulo/overridetree.cb
1 file changed, 49 insertions(+), 0 deletions(-)

Approvals:
  Eric Lai: Looks good to me, approved
  build bot (Jenkins): Verified

diff --git a/src/mainboard/google/brya/variants/trulo/overridetree.cb b/src/mainboard/google/brya/variants/trulo/overridetree.cb
index cf01efb..aebd1e79 100644
--- a/src/mainboard/google/brya/variants/trulo/overridetree.cb
+++ b/src/mainboard/google/brya/variants/trulo/overridetree.cb
@@ -19,6 +19,55 @@
    # Enable CNVi BT
    register "cnvi_bt_core" = "true"

+	# eMMC HS400
+	register "emmc_enable_hs400_mode" = "1"
+
+	#eMMC DLL tuning parameters
+	# EMMC Tx CMD Delay
+	# Refer to EDS-Vol2-42.3.7.
+	# [14:8] steps of delay for DDR mode, each 125ps, range: 0 - 39.
+	# [6:0] steps of delay for SDR mode, each 125ps, range: 0 - 39.
+	register "common_soc_config.emmc_dll.emmc_tx_cmd_cntl" = "0x505"
+
+	# EMMC TX DATA Delay 1
+	# Refer to EDS-Vol2-42.3.8.
+	# [14:8] steps of delay for HS400, each 125ps, range: 0 - 78.
+	# [6:0] steps of delay for SDR104/HS200, each 125ps, range: 0 - 79.
+	register "common_soc_config.emmc_dll.emmc_tx_data_cntl1" = "0x909"
+
+	# EMMC TX DATA Delay 2
+	# Refer to EDS-Vol2-42.3.9.
+	# [30:24] steps of delay for SDR50, each 125ps, range: 0 - 79.
+	# [22:16] steps of delay for DDR50, each 125ps, range: 0 - 78.
+	# [14:8] steps of delay for SDR25/HS50, each 125ps, range: 0 -79.
+	# [6:0] steps of delay for SDR12, each 125ps. Range: 0 - 79.
+	register "common_soc_config.emmc_dll.emmc_tx_data_cntl2" = "0x1C2A2828"
+
+	# EMMC RX CMD/DATA Delay 1
+	# Refer to EDS-Vol2-42.3.10.
+	# [30:24] steps of delay for SDR50, each 125ps, range: 0 - 119.
+	# [22:16] steps of delay for DDR50, each 125ps, range: 0 - 78.
+	# [14:8] steps of delay for SDR25/HS50, each 125ps, range: 0 - 119.
+	# [6:0] steps of delay for SDR12, each 125ps, range: 0 - 119.
+	register "common_soc_config.emmc_dll.emmc_rx_cmd_data_cntl1" = "0x1C1B4F1B"
+
+	# EMMC RX CMD/DATA Delay 2
+	# Refer to EDS-Vol2-42.3.12.
+	# [17:16] stands for Rx Clock before Output Buffer,
+	#         00: Rx clock after output buffer,
+	#         01: Rx clock before output buffer,
+	#         10: Automatic selection based on working mode.
+	#         11: Reserved
+	# [14:8] steps of delay for Auto Tuning Mode, each 125ps, range: 0 - 39.
+	# [6:0] steps of delay for HS200, each 125ps, range: 0 - 79.
+	register "common_soc_config.emmc_dll.emmc_rx_cmd_data_cntl2" = "0x1004E"
+
+	# EMMC Rx Strobe Delay
+	# Refer to EDS-Vol2-42.3.11.
+	# [14:8] Rx Strobe Delay DLL 1(HS400 Mode), each 125ps, range: 0 - 39.
+	# [6:0] Rx Strobe Delay DLL 2(HS400 Mode), each 125ps, range: 0 - 39.
+	register "common_soc_config.emmc_dll.emmc_rx_strobe_cntl" = "0x01515"
+
    register "usb2_ports[0]" = "USB2_PORT_MID(OC1)"         # USB2_A0(MLB)
    register "usb2_ports[1]" = "USB2_PORT_MID(OC_SKIP)"     # USB2_A1 (DB)
    register "usb2_ports[2]" = "USB2_PORT_MID(OC_SKIP)"     # M.2 Camera