MIPS: Introduce plat_get_fdt a platform API to retrieve the FDT

Early access to the kernel command line requires early access to the FDT
for platforms which pass the command line within the device tree. There
was no common way to retrieve the location of the FDT without incurring
side effects, such as plat_mem_setup which, on Malta at least,
initializes a bunch of other stuff.

This patch adds plat_get_ftd() for IMG platforms.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: kernel-hardening@lists.openwall.com
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12988/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/mips/mti-malta/malta-setup.c b/arch/mips/mti-malta/malta-setup.c
index 4740c82fb97a..33d5ff5069e5 100644
--- a/arch/mips/mti-malta/malta-setup.c
+++ b/arch/mips/mti-malta/malta-setup.c
@@ -248,10 +248,15 @@ static void __init bonito_quirks_setup(void)
 #endif
 }
 
+void __init *plat_get_fdt(void)
+{
+	return (void *)__dtb_start;
+}
+
 void __init plat_mem_setup(void)
 {
 	unsigned int i;
-	void *fdt = __dtb_start;
+	void *fdt = plat_get_fdt();
 
 	fdt = malta_dt_shim(fdt);
 	__dt_setup_arch(fdt);