[S] Change in coreboot[master]: mb/google/rex/var/ovis: Enable LAN0

[Subrata Banik (Code Review)]

Attention is currently required from: Jakub Czapiga, Kapil Porwal, Tarun Tuli.

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/76213?usp=email )

Change subject: mb/google/rex/var/ovis: Enable LAN0
......................................................................

mb/google/rex/var/ovis: Enable LAN0

This patch performs below operations to enable LAN0.
  - Complete the LAN PEREST power sequencing
  - Program the SRC_CLKREQ (GPP_D20) with correctly.
  - Add overridetree.cb entry to configure the LAN0 device.

BUG=b:289395519
TEST=Able to boot google/ovis with LAN0 being enabled.

Change-Id: I91b0a76395ade4459cf8705c333728a71f95df14
Signed-off-by: Subrata Banik 
---
M src/mainboard/google/rex/variants/ovis/gpio.c
M src/mainboard/google/rex/variants/ovis/overridetree.cb
2 files changed, 15 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/13/76213/1

diff --git a/src/mainboard/google/rex/variants/ovis/gpio.c b/src/mainboard/google/rex/variants/ovis/gpio.c
index 6c1794d..b86307f 100644
--- a/src/mainboard/google/rex/variants/ovis/gpio.c
+++ b/src/mainboard/google/rex/variants/ovis/gpio.c
@@ -188,8 +188,8 @@
    PAD_CFG_GPI_APIC_LOCK(GPP_D18, NONE, LEVEL, INVERT, LOCK_CONFIG),
    /* GPP_D19 : [] ==> SSD_CLKREQ_ODL */
    PAD_CFG_NF(GPP_D19, NONE, DEEP, NF1),
-	/* GPP_D20 : [] ==> EN_LAN_RAILS */
-	PAD_NC(GPP_D20, NONE),
+	/* GPP_D20 : [] ==> LAN_CLKREQ_ODL */
+	PAD_CFG_NF(GPP_D20, NONE, DEEP, NF1),
    /* GPP_D21 : [] ==> WLAN_CLKREQ_ODL */
    PAD_CFG_NF(GPP_D21, NONE, DEEP, NF2),
    /* GPP_D22 : [] ==> NC */
@@ -398,6 +398,9 @@
    /* GPP_A20 : [] ==> SSD_PERST_L */
    PAD_CFG_GPO(GPP_A20, 0, DEEP),

+	/* GPP_C13 : [] ==> LAN_PERST_L */
+	PAD_CFG_GPO(GPP_C13, 0, DEEP),
+
    /* GPP_H10 : [] ==> SOC_WP_OD */
    PAD_CFG_GPI_GPIO_DRIVER_LOCK(GPP_H10, NONE, LOCK_CONFIG),

@@ -406,6 +409,8 @@
 };

static const struct pad_config romstage_gpio_table[] = {
+	/* GPP_C13 : [] ==> LAN_PERST_L */
+	PAD_CFG_GPO(GPP_C13, 0, DEEP),
    /* A20 : [] ==> SSD_PERST_L */
    PAD_CFG_GPO(GPP_A20, 0, DEEP),
    /* GPP_D02 : [] ==> SD_PERST_L */
diff --git a/src/mainboard/google/rex/variants/ovis/overridetree.cb b/src/mainboard/google/rex/variants/ovis/overridetree.cb
index 259aaf5..112072c 100644
--- a/src/mainboard/google/rex/variants/ovis/overridetree.cb
+++ b/src/mainboard/google/rex/variants/ovis/overridetree.cb
@@ -63,7 +63,14 @@
    			.flags = PCIE_RP_LTR | PCIE_RP_AER,
    		}"
    	end	#PCIE7 LAN1 card
-
+		device ref pcie_rp10 on
+			# Enable LAN0 Card PCIE 10 using clk 8
+			register "pcie_rp[PCH_RP(10)]" = "{
+				.clk_src = 8,
+				.clk_req = 8,
+				.flags = PCIE_RP_LTR | PCIE_RP_AER,
+			}"
+		end	#PCIE10 LAN0 card
    	device ref pcie_rp11 on
    		# Enable SSD Card PCIE 11 using clk 7
    		register "pcie_rp[PCH_RP(11)]" = "{