ARM: tegra: enable PCIe controller on p2771-0000

p2771-0000 has a couple of PCIe ports; one physically x4 desktop PCI
connector (which may run at x2 electrically, depending on the board
version and configuration) and a x1 connection to the M.2 slot (which may
not be active, depending on the board version and configuration). This
change enables those.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/dts/tegra186-p2771-0000-a02.dts

@@ -10,4 +10,23 @@
 		cd-gpios = <&gpio_main TEGRA_MAIN_GPIO(P, 6) GPIO_ACTIVE_LOW>;
 		power-gpios = <&gpio_main TEGRA_MAIN_GPIO(P, 5) GPIO_ACTIVE_HIGH>;
 	};
+
+	pcie-controller@10003000 {
+		status = "okay";
+
+		pci@1,0 {
+			status = "okay";
+			nvidia,num-lanes = <2>;
+		};
+
+		pci@2,0 {
+			status = "disabled";
+			nvidia,num-lanes = <1>;
+		};
+
+		pci@3,0 {
+			status = "okay";
+			nvidia,num-lanes = <1>;
+		};
+	};
 };

arch/arm/dts/tegra186-p2771-0000-b00.dts

@@ -10,4 +10,23 @@
 		cd-gpios = <&gpio_main TEGRA_MAIN_GPIO(P, 5) GPIO_ACTIVE_LOW>;
 		power-gpios = <&gpio_main TEGRA_MAIN_GPIO(P, 6) GPIO_ACTIVE_HIGH>;
 	};
+
+	pcie-controller@10003000 {
+		status = "okay";
+
+		pci@1,0 {
+			status = "okay";
+			nvidia,num-lanes = <4>;
+		};
+
+		pci@2,0 {
+			status = "disabled";
+			nvidia,num-lanes = <0>;
+		};
+
+		pci@3,0 {
+			status = "disabled";
+			nvidia,num-lanes = <1>;
+		};
+	};
 };

board/nvidia/p2771-0000/p2771-0000.c

@@ -31,3 +31,25 @@ int tegra_board_init(void)
 
 	return 0;
 }
+
+int tegra_pcie_board_init(void)
+{
+	struct udevice *dev;
+	uchar val;
+	int ret;
+
+	/* Turn on MAX77620 LDO7 to 1.05V for PEX power */
+	debug("%s: Set LDO7 for PEX power to 1.05V\n", __func__);
+	ret = i2c_get_chip_for_busnum(0, MAX77620_I2C_ADDR_7BIT, 1, &dev);
+	if (ret) {
+		printf("%s: Cannot find MAX77620 I2C chip\n", __func__);
+		return -1;
+	}
+	/* 0xC5 for 1.05v, enabled: bit7:6 = 11 = enable, bit5:0 = voltage */
+	val = 0xC5;
+	ret = dm_i2c_write(dev, MAX77620_CNFG1_L7_REG, &val, 1);
+	if (ret)
+		printf("i2c_write 0 0x3c 0x31 failed: %d\n", ret);
+
+	return 0;
+}

configs/p2771-0000-a02_defconfig

@@ -26,7 +26,12 @@ CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_RTL8169=y
+CONFIG_E1000=y
+CONFIG_PCI_TEGRA=y
 CONFIG_TEGRA186_BPMP_I2C=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
+CONFIG_POWER_DOMAIN=y
+CONFIG_TEGRA186_POWER_DOMAIN=y

configs/p2771-0000-b00_defconfig

@@ -26,7 +26,12 @@ CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_RTL8169=y
+CONFIG_E1000=y
+CONFIG_PCI_TEGRA=y
 CONFIG_TEGRA186_BPMP_I2C=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
+CONFIG_POWER_DOMAIN=y
+CONFIG_TEGRA186_POWER_DOMAIN=y

include/configs/p2771-0000.h

@@ -28,6 +28,11 @@
 #define CONFIG_SYS_MMC_ENV_PART		2
 #define CONFIG_ENV_OFFSET		(-CONFIG_ENV_SIZE)
 
+/* PCI host support */
+#define CONFIG_PCI
+#define CONFIG_PCI_PNP
+#define CONFIG_CMD_PCI
+
 #include "tegra-common-post.h"
 
 /* Crystal is 38.4MHz. clk_m runs at half that rate */