[PATCH v2 1/4] riscv: lib: Add a default implementation of board_fdt_blob_setup

[Yao Zi <ziyao@disroot.org>]

It's common for S-Mode proper U-Boot to retrieve a FDT blob along with
taking control from SBI firmware. Add a weak version of
board_fdt_blob_setup to make use of it by default, avoiding copy-pasting
similar functions among boards.

Signed-off-by: Yao Zi <ziyao@disroot.org>
---
 arch/riscv/lib/Makefile |  1 +
 arch/riscv/lib/board.c  | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 arch/riscv/lib/board.c

diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
index 268116f3757..b33f9c646dd 100644
--- a/arch/riscv/lib/Makefile
+++ b/arch/riscv/lib/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_$(XPL_)SMP) += smp.o
 obj-$(CONFIG_XPL_BUILD)	+= spl.o
 obj-y   += fdt_fixup.o
 obj-$(CONFIG_$(SPL)CMD_BDI) += bdinfo.o
+obj-$(CONFIG_OF_BOARD) += board.o
 
 # For building EFI apps
 CFLAGS_NON_EFI := -fstack-protector-strong
diff --git a/arch/riscv/lib/board.c b/arch/riscv/lib/board.c
new file mode 100644
index 00000000000..1630355b2b1
--- /dev/null
+++ b/arch/riscv/lib/board.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RISC-V-specific handling of firmware FDT
+ */
+
+#include <asm/global_data.h>
+#include <linux/errno.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+__weak int board_fdt_blob_setup(void **fdtp)
+{
+	if (IS_ENABLED(CONFIG_XPL_BUILD) || !gd->arch.firmware_fdt_addr)
+		return -EEXIST;
+
+	*fdtp = (void *)gd->arch.firmware_fdt_addr;
+
+	return 0;
+}
-- 
2.48.1