[RFC PATCH v2 19/21] ACPI: bus: Add acpi_riscv_init function

[Sunil V L <sunilvl@ventanamicro.com>]

Add a new function for RISC-V to do any architecture specific
initialization. This function will be used to create platform devices
like APLIC, PLIC, RISC-V IOMMU etc. This is similar to acpi_arm_init().

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
 drivers/acpi/bus.c          |  1 +
 drivers/acpi/riscv/Makefile |  2 +-
 drivers/acpi/riscv/init.c   | 12 ++++++++++++
 include/linux/acpi.h        |  6 ++++++
 4 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 drivers/acpi/riscv/init.c

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 9eace6c7042e..f7ac0caf04cf 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -1417,6 +1417,7 @@ static int __init acpi_init(void)
 	acpi_hest_init();
 	acpi_ghes_init();
 	acpi_arm_init();
+	acpi_riscv_init();
 	acpi_scan_init();
 	acpi_ec_init();
 	acpi_debugfs_init();
diff --git a/drivers/acpi/riscv/Makefile b/drivers/acpi/riscv/Makefile
index f80b3da230e9..c4d679b1359e 100644
--- a/drivers/acpi/riscv/Makefile
+++ b/drivers/acpi/riscv/Makefile
@@ -1,2 +1,2 @@
 # SPDX-License-Identifier: GPL-2.0-only
-obj-y 	+= rhct.o irq.o
+obj-y 	+= rhct.o irq.o init.o
diff --git a/drivers/acpi/riscv/init.c b/drivers/acpi/riscv/init.c
new file mode 100644
index 000000000000..b5807bbdb171
--- /dev/null
+++ b/drivers/acpi/riscv/init.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023, Ventana Micro Systems Inc
+ *	Author: Sunil V L <sunilvl@ventanamicro.com>
+ *
+ */
+
+#include <linux/acpi.h>
+
+void __init acpi_riscv_init(void)
+{
+}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 19c3dda9c2ed..c408070ac52e 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1527,6 +1527,12 @@ void acpi_arm_init(void);
 static inline void acpi_arm_init(void) { }
 #endif
 
+#ifdef CONFIG_RISCV
+void acpi_riscv_init(void);
+#else
+static inline void acpi_riscv_init(void) { }
+#endif
+
 #ifdef CONFIG_ACPI_PCC
 void acpi_init_pcc(void);
 #else
-- 
2.39.2