pci: tegra: Add Tegra PCIe driver

Add support for the PCIe controller found on some generations of Tegra.
Tegra20 has 2 root ports with a total of 4 lanes, Tegra30 has 3 root
ports with a total of 6 lanes and Tegra124 has 2 root ports with a total
of 5 lanes.

This is based on the Linux kernel driver, originally submitted upstream
by Mike Rapoport.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

drivers/pci/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_FTPCI100) += pci_ftpci100.o
 obj-$(CONFIG_SH4_PCI) += pci_sh4.o
 obj-$(CONFIG_SH7751_PCI) +=pci_sh7751.o
 obj-$(CONFIG_SH7780_PCI) +=pci_sh7780.o
+obj-$(CONFIG_PCI_TEGRA) += pci_tegra.o
 obj-$(CONFIG_TSI108_PCI) += tsi108_pci.o
 obj-$(CONFIG_WINBOND_83C553) += w83c553f.o
 obj-$(CONFIG_PCIE_LAYERSCAPE) += pcie_layerscape.o

include/fdtdec.h

@@ -86,6 +86,9 @@ enum fdt_compat_id {
 	COMPAT_NVIDIA_TEGRA20_SFLASH,	/* Tegra 2 SPI flash controller */
 	COMPAT_NVIDIA_TEGRA20_SLINK,	/* Tegra 2 SPI SLINK controller */
 	COMPAT_NVIDIA_TEGRA114_SPI,	/* Tegra 114 SPI controller */
+	COMPAT_NVIDIA_TEGRA124_PCIE,	/* Tegra 124 PCIe controller */
+	COMPAT_NVIDIA_TEGRA30_PCIE,	/* Tegra 30 PCIe controller */
+	COMPAT_NVIDIA_TEGRA20_PCIE,	/* Tegra 20 PCIe controller */
 	COMPAT_NVIDIA_TEGRA124_XUSB_PADCTL,
 					/* Tegra124 XUSB pad controller */
 	COMPAT_SMSC_LAN9215,		/* SMSC 10/100 Ethernet LAN9215 */

lib/fdtdec.c

@@ -41,6 +41,9 @@ static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"),
 	COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"),
 	COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"),
+	COMPAT(NVIDIA_TEGRA124_PCIE, "nvidia,tegra124-pcie"),
+	COMPAT(NVIDIA_TEGRA30_PCIE, "nvidia,tegra30-pcie"),
+	COMPAT(NVIDIA_TEGRA20_PCIE, "nvidia,tegra20-pcie"),
 	COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"),
 	COMPAT(SMSC_LAN9215, "smsc,lan9215"),
 	COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),