MIPS: ingenic: Add support for appended devicetree

Add support for booting the kernel from an externally-appended devicetree, if no devicetree was built-in. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
donald · Feb 21, 2019 · 15205fc · 15205fc
1 parent 69a07a4
commit 15205fc
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Showing 2 changed files with 11 additions and 5 deletions.
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
@@ -390,7 +390,7 @@ config MACH_INGENIC
 	select GPIOLIB
 	select COMMON_CLK
 	select GENERIC_IRQ_CHIP
-	select BUILTIN_DTB
+	select BUILTIN_DTB if MIPS_NO_APPENDED_DTB
 	select USE_OF
 	select LIBFDT
 

diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c
@@ -31,7 +31,6 @@
 
 #define JZ4740_EMC_SDRAM_CTRL 0x80
 
-
 static void __init jz4740_detect_mem(void)
 {
 	void __iomem *jz_emc_base;
@@ -66,15 +65,22 @@ static unsigned long __init get_board_mach_type(const void *fdt)
 void __init plat_mem_setup(void)
 {
 	int offset;
+	void *dtb;
 
 	jz4740_reset_init();
-	__dt_setup_arch(__dtb_start);
 
-	offset = fdt_path_offset(__dtb_start, "/memory");
+	if (__dtb_start != __dtb_end)
+		dtb = __dtb_start;
+	else
+		dtb = (void *)fw_passed_dtb;
+
+	__dt_setup_arch(dtb);
+
+	offset = fdt_path_offset(dtb, "/memory");
 	if (offset < 0)
 		jz4740_detect_mem();
 
-	mips_machtype = get_board_mach_type(__dtb_start);
+	mips_machtype = get_board_mach_type(dtb);
 }
 
 void __init device_tree_init(void)