MIPS: ath25: add AR2315 PCI host controller driver

Add PCI host controller driver and DMA address calculation hook.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8246/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/ath25/Kconfig b/arch/mips/ath25/Kconfig
index ca3dde4..fc19dd5 100644
--- a/arch/mips/ath25/Kconfig
+++ b/arch/mips/ath25/Kconfig
@@ -7,3 +7,10 @@
 	bool "Atheros AR2315+ SoC support"
 	depends on ATH25
 	default y
+
+config PCI_AR2315
+	bool "Atheros AR2315 PCI controller support"
+	depends on SOC_AR2315
+	select HW_HAS_PCI
+	select PCI
+	default y