lib: utils/sys: Use kconfig for enabling/disabling drivers

We update system drivers makefile to use kconfig for enabling/disabling
drivers. To avoid compile errors, we also enable appropriate system
drivers for each platform.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Tested-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Atish Patra <atishp@rivosinc.com>
Tested-by: Atish Patra <atishp@rivosinc.com>

lib/utils/Kconfig

@@ -6,4 +6,6 @@ source "$(OPENSBI_SRC_DIR)/lib/utils/reset/Kconfig"
 
 source "$(OPENSBI_SRC_DIR)/lib/utils/serial/Kconfig"
 
+source "$(OPENSBI_SRC_DIR)/lib/utils/sys/Kconfig"
+
 endmenu

lib/utils/reset/Kconfig

@@ -14,10 +14,12 @@ config FDT_RESET_GPIO
 
 config FDT_RESET_HTIF
 	bool "Host transfer interface (HTIF) FDT reset driver"
+	select SYS_HTIF
 	default n
 
 config FDT_RESET_SIFIVE_TEST
 	bool "SiFive Test FDT reset driver"
+	select SYS_SIFIVE_TEST
 	default n
 
 config FDT_RESET_SUNXI_WDT

lib/utils/serial/Kconfig

@@ -15,6 +15,7 @@ config FDT_SERIAL_GAISLER
 
 config FDT_SERIAL_HTIF
 	bool "Host transfer interface (HTIF) UART FDT driver"
+	select SYS_HTIF
 	default n
 
 config FDT_SERIAL_SHAKTI

lib/utils/sys/Kconfig

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: BSD-2-Clause
+
+menu "System Device Support"
+
+config SYS_HTIF
+	bool "Host transfere interface (HTIF) support"
+	default n
+
+config SYS_SIFIVE_TEST
+	bool "SiFive test support"
+	default n
+
+endmenu

lib/utils/sys/objects.mk

@@ -7,5 +7,5 @@
 #   Anup Patel <anup.patel@wdc.com>
 #
 
-libsbiutils-objs-y += sys/htif.o
-libsbiutils-objs-y += sys/sifive_test.o
+libsbiutils-objs-$(CONFIG_SYS_HTIF) += sys/htif.o
+libsbiutils-objs-$(CONFIG_SYS_SIFIVE_TEST) += sys/sifive_test.o