From: Hauke Mehrtens Date: Sat, 19 Mar 2016 17:28:51 +0000 (+0100) Subject: MIPS: Lantiq: Add support for device tree file from boot loader X-Git-Tag: Ubuntu-5.10.0-12.13~12610^2~211 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=84f47cf49e3c8348f4a0a04e8fa2404f1e2722cc;p=mirror_ubuntu-hirsute-kernel.git 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 --- diff --git a/arch/mips/lantiq/prom.c b/arch/mips/lantiq/prom.c index 297bcaa6b5d3..a5c7fec92a97 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)