[PATCH 2/8] ACPI: LoongArch: Add ACPI_IOVT option

ACPI_IOVT is acpi table with IOMMU device on LoongArch system, here
option ACPI_IOVT is added. And empty function acpi_iovt_init() is
added and called in acpi_arch_init().

Signed-off-by: Bibo Mao <[email protected]>
---
 arch/loongarch/Kconfig          | 1 +
 drivers/acpi/Kconfig            | 4 ++++
 drivers/acpi/loongarch/Kconfig  | 7 +++++++
 drivers/acpi/loongarch/Makefile | 1 +
 drivers/acpi/loongarch/init.c   | 3 +++
 drivers/acpi/loongarch/init.h   | 4 ++++
 drivers/acpi/loongarch/iovt.c   | 7 +++++++
 7 files changed, 27 insertions(+)
 create mode 100644 drivers/acpi/loongarch/Kconfig
 create mode 100644 drivers/acpi/loongarch/init.h
 create mode 100644 drivers/acpi/loongarch/iovt.c

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 3f69c5d7e48e..6f0b6b539c0b 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -6,6 +6,7 @@ config LOONGARCH
 	select ACPI_GENERIC_GSI if ACPI
 	select ACPI_MCFG if ACPI
 	select ACPI_HOTPLUG_CPU if ACPI_PROCESSOR && HOTPLUG_CPU
+	select ACPI_IOVT if ACPI
 	select ACPI_PPTT if ACPI
 	select ACPI_SYSTEM_POWER_STATES_SUPPORT	if ACPI
 	select ARCH_BINFMT_ELF_STATE
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index f165d14cf61a..192e6f18eda1 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -550,6 +550,10 @@ if ARM64
 source "drivers/acpi/arm64/Kconfig"
 endif
 
+if LOONGARCH
+source "drivers/acpi/loongarch/Kconfig"
+endif
+
 if RISCV
 source "drivers/acpi/riscv/Kconfig"
 endif
diff --git a/drivers/acpi/loongarch/Kconfig b/drivers/acpi/loongarch/Kconfig
new file mode 100644
index 000000000000..91ba3c35b9bf
--- /dev/null
+++ b/drivers/acpi/loongarch/Kconfig
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# ACPI Configuration for LOONGARCH
+#
+
+config ACPI_IOVT
+	bool
diff --git a/drivers/acpi/loongarch/Makefile b/drivers/acpi/loongarch/Makefile
index d3764139dfaf..c338d3102fc1 100644
--- a/drivers/acpi/loongarch/Makefile
+++ b/drivers/acpi/loongarch/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-y					+= init.o
+obj-$(CONFIG_ACPI_IOVT)			+= iovt.o
diff --git a/drivers/acpi/loongarch/init.c b/drivers/acpi/loongarch/init.c
index 7008e50b3e9d..9233f6c1cb55 100644
--- a/drivers/acpi/loongarch/init.c
+++ b/drivers/acpi/loongarch/init.c
@@ -1,7 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
 #include <linux/acpi.h>
+#include "init.h"
 
 void __init acpi_arch_init(void)
 {
+	if (IS_ENABLED(CONFIG_ACPI_IOVT))
+		acpi_iovt_init();
 }
diff --git a/drivers/acpi/loongarch/init.h b/drivers/acpi/loongarch/init.h
new file mode 100644
index 000000000000..070ea187bfae
--- /dev/null
+++ b/drivers/acpi/loongarch/init.h
@@ -0,0 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#include <linux/init.h>
+
+void __init acpi_iovt_init(void);
diff --git a/drivers/acpi/loongarch/iovt.c b/drivers/acpi/loongarch/iovt.c
new file mode 100644
index 000000000000..793ed13a2cef
--- /dev/null
+++ b/drivers/acpi/loongarch/iovt.c
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "init.h"
+
+void __init acpi_iovt_init(void)
+{
+}
-- 
2.39.3