From 84f47cf49e3c8348f4a0a04e8fa2404f1e2722cc Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sat, 19 Mar 2016 18:28:51 +0100 Subject: MIPS: Lantiq: Add support for device tree file from boot loader This fetches the device tree file like it is specified in the MIPS UHI interface if one was found. This is also used when the device tree file was appended to the kernel image with cat. This code is copied from arch/mips/bmips/setup.c. Signed-off-by: Hauke Mehrtens Acked-by: John Crispin Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/12898/ Signed-off-by: Ralf Baechle --- arch/mips/lantiq/prom.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'arch/mips/lantiq') diff --git a/arch/mips/lantiq/prom.c b/arch/mips/lantiq/prom.c index 297bcaa..a5c7fec 100644 --- a/arch/mips/lantiq/prom.c +++ b/arch/mips/lantiq/prom.c @@ -65,6 +65,8 @@ static void __init prom_init_cmdline(void) void __init plat_mem_setup(void) { + void *dtb; + ioport_resource.start = IOPORT_RESOURCE_START; ioport_resource.end = IOPORT_RESOURCE_END; iomem_resource.start = IOMEM_RESOURCE_START; @@ -72,11 +74,18 @@ void __init plat_mem_setup(void) set_io_port_base((unsigned long) KSEG1); + if (fw_arg0 == -2) /* UHI interface */ + dtb = (void *)fw_arg1; + else if (__dtb_start != __dtb_end) + dtb = (void *)__dtb_start; + else + panic("no dtb found"); + /* - * Load the builtin devicetree. This causes the chosen node to be + * Load the devicetree. This causes the chosen node to be * parsed resulting in our memory appearing */ - __dt_setup_arch(__dtb_start); + __dt_setup_arch(dtb); } void __init device_tree_init(void) -- cgit v1.1