spl: Allow PCI drivers to be used in SPL

Add a new Kconfig option to allow PCI drivers to be used in SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

common/spl/Kconfig

@@ -435,6 +435,15 @@ config SYS_OS_BASE
 
 endif # SPL_OS_BOOT
 
+config SPL_PCI_SUPPORT
+	bool "Support PCI drivers"
+	depends on SPL
+	help
+	  Enable support for PCI in SPL. For platforms that need PCI to boot,
+	  or must perform some init using PCI in SPL, this provides the
+	  necessary driver support. This enables the drivers in drivers/pci
+	  as part of an SPL build.
+
 config SPL_POST_MEM_SUPPORT
 	bool "Support POST drivers"
 	depends on SPL

drivers/Makefile

@@ -33,6 +33,7 @@ obj-$(CONFIG_SPL_DMA_SUPPORT) += dma/
 obj-$(CONFIG_SPL_ETH_SUPPORT) += net/
 obj-$(CONFIG_SPL_ETH_SUPPORT) += net/phy/
 obj-$(CONFIG_SPL_USBETH_SUPPORT) += net/phy/
+obj-$(CONFIG_SPL_PCI_SUPPORT) += pci/
 obj-$(CONFIG_SPL_MUSB_NEW_SUPPORT) += usb/musb-new/
 obj-$(CONFIG_SPL_USB_GADGET_SUPPORT) += usb/gadget/
 obj-$(CONFIG_SPL_USB_GADGET_SUPPORT) += usb/gadget/udc/