x86: sandbox: pch: Add a CONFIG option for PCH

At present this uclass is selected only on x86. In order to add a test for
it, it must also support sandbox. Create a new CONFIG_PCH option and
enable it on x86 and sandbox.

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

arch/Kconfig

@@ -117,6 +117,7 @@ config SANDBOX
 	imply VIRTIO_BLK
 	imply VIRTIO_NET
 	imply DM_SOUND
+	imply PCH
 
 config SH
 	bool "SuperH architecture"
@@ -160,6 +161,7 @@ config X86
 	imply USB_ETHER_ASIX
 	imply USB_ETHER_SMSC95XX
 	imply USB_HOST_ETHER
+	imply PCH
 
 config XTENSA
 	bool "Xtensa architecture"

drivers/Kconfig

@@ -64,6 +64,8 @@ source "drivers/nvme/Kconfig"
 
 source "drivers/pci/Kconfig"
 
+source "drivers/pch/Kconfig"
+
 source "drivers/pcmcia/Kconfig"
 
 source "drivers/phy/Kconfig"

drivers/Makefile

@@ -86,7 +86,8 @@ obj-y += misc/
 obj-$(CONFIG_MMC) += mmc/
 obj-$(CONFIG_NVME) += nvme/
 obj-y += pcmcia/
-obj-$(CONFIG_X86) += pch/
+obj-y += dfu/
+obj-$(CONFIG_PCH) += pch/
 obj-y += phy/allwinner/
 obj-y += phy/marvell/
 obj-y += rtc/

drivers/pch/Kconfig

@@ -0,0 +1,9 @@
+config PCH
+	bool "Enable Platform-controller Hub (PCH) support"
+	depends on X86 || SANDBOX
+	help
+	  Most x86 chips include a PCH which is responsible for handling
+	  parts of the system not handled by that CPU. It supersedes the
+	  northbridge / southbridge architecture that was previously used. The
+	  PCH allows for higher performance since the memory functions are
+	  handled in the CPU.