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>
diff --git a/board/nvidia/p2771-0000/p2771-0000.c b/board/nvidia/p2771-0000/p2771-0000.c
index 0c828a2..529ed9d 100644
--- a/board/nvidia/p2771-0000/p2771-0000.c
+++ b/board/nvidia/p2771-0000/p2771-0000.c
@@ -31,3 +31,25 @@
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;
+}