From 43f624aa4f145497d2b1814916440a285f55a959 Mon Sep 17 00:00:00 2001 From: Chen-Yu Tsai Date: Wed, 17 Jan 2018 16:46:54 +0800 Subject: ARM: dts: sun9i: Add secure SRAM node used for SMP hotplug The A80 stores some magic flags in a portion of the secure SRAM. The BROM jumps directly to the software entry point set by the SMP code if the flags are set. This is required for CPU0 hotplugging. Acked-by: Maxime Ripard Signed-off-by: Chen-Yu Tsai --- arch/arm/boot/dts/sun9i-a80.dtsi | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'arch') diff --git a/arch/arm/boot/dts/sun9i-a80.dtsi b/arch/arm/boot/dts/sun9i-a80.dtsi index bf4d40e8359f..b1c86b76ac3c 100644 --- a/arch/arm/boot/dts/sun9i-a80.dtsi +++ b/arch/arm/boot/dts/sun9i-a80.dtsi @@ -250,6 +250,25 @@ */ ranges = <0 0 0 0x20000000>; + sram_b: sram@20000 { + /* 256 KiB secure SRAM at 0x20000 */ + compatible = "mmio-sram"; + reg = <0x00020000 0x40000>; + + #address-cells = <1>; + #size-cells = <1>; + ranges = <0 0x00020000 0x40000>; + + smp-sram@1000 { + /* + * This is checked by BROM to determine if + * cpu0 should jump to SMP entry vector + */ + compatible = "allwinner,sun9i-a80-smp-sram"; + reg = <0x1000 0x8>; + }; + }; + ehci0: usb@a00000 { compatible = "allwinner,sun9i-a80-ehci", "generic-ehci"; reg = <0x00a00000 0x100>; -- cgit v1.2.3