spl: Allow PCH drivers to be used in SPL

Add an option for building Platorm Controller Hub drivers in SPL.

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

common/spl/Kconfig

@@ -444,6 +444,15 @@ config SPL_PCI_SUPPORT
 	  necessary driver support. This enables the drivers in drivers/pci
 	  as part of an SPL build.
 
+config SPL_PCH_SUPPORT
+	bool "Support PCH drivers"
+	depends on SPL
+	help
+	  Enable support for PCH (Platform Controller Hub) devices in SPL.
+	  These are used to set up GPIOs and the SPI peripheral early in
+	  boot. This enables the drivers in drivers/pch as part of an SPL
+	  build.
+
 config SPL_POST_MEM_SUPPORT
 	bool "Support POST drivers"
 	depends on SPL

drivers/Makefile

@@ -34,6 +34,7 @@ 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-$(CONFIG_SPL_PCH_SUPPORT) += pch/
 obj-$(CONFIG_SPL_RTC_SUPPORT) += rtc/
 obj-$(CONFIG_SPL_TIMER_SUPPORT) += timer/
 obj-$(CONFIG_SPL_MUSB_NEW_SUPPORT) += usb/musb-new/