[PATCH 5/7] riscv: Add Kconfig option for SBI v0.2

[Bin Meng]

SBI v0.2 is more scalable and extendable to handle future needs
for RISC-V supervisor interfaces. For example, with SBI v0.2 HSM
extension, only a single hart need to boot and enter operating
system. The booting hart can bring up secondary harts one by one
afterwards.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
---

 arch/riscv/Kconfig | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 502143f..ae801d3 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -226,14 +226,32 @@ config SBI
 	bool
 	default y if RISCV_SMODE || SPL_RISCV_SMODE
 
+choice
+	prompt "SBI support"
+	default SBI_V01
+
 config SBI_V01
 	bool "SBI v0.1 support"
-	default y
 	depends on SBI
 	help
 	  This config allows kernel to use SBI v0.1 APIs. This will be
 	  deprecated in future once legacy M-mode software are no longer in use.
 
+config SBI_V02
+	bool "SBI v0.2 support"
+	depends on SBI
+	help
+	  This config allows kernel to use SBI v0.2 APIs. SBI v0.2 is more
+	  scalable and extendable to handle future needs for RISC-V supervisor
+	  interfaces. For example, with SBI v0.2 HSM extension, only a single
+	  hart need to boot and enter operating system. The booting hart can
+	  bring up secondary harts one by one afterwards.
+
+	  Choose this option if OpenSBI v0.7 or above release is used together
+	  with U-Boot.
+
+endchoice
+
 config SBI_IPI
 	bool
 	depends on SBI
-- 
2.7.4