[RFC 4/6] ARC: HAPS: add HIGHMEM memory zone to DTS

[Eugeniy Paltsev]

This is required as a preparation of merging nSIM and HASP
defonfig and device tree.

As we have HIGHMEM disabled in both HAPS and nSIM defconfigs
this doesn't lead to any functional change.

Signed-off-by: Eugeniy Paltsev <eugeniy.palt...@synopsys.com>
---
 arch/arc/boot/dts/haps_hs.dts | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/arc/boot/dts/haps_hs.dts b/arch/arc/boot/dts/haps_hs.dts
index 11fad2f79056..60d578e2781f 100644
--- a/arch/arc/boot/dts/haps_hs.dts
+++ b/arch/arc/boot/dts/haps_hs.dts
@@ -9,13 +9,15 @@
 / {
        model = "snps,zebu_hs";
        compatible = "snps,zebu_hs";
-       #address-cells = <1>;
-       #size-cells = <1>;
+       #address-cells = <2>;
+       #size-cells = <2>;
        interrupt-parent = <&core_intc>;
 
        memory {
                device_type = "memory";
-               reg = <0x80000000 0x20000000>;  /* 512 */
+               /* CONFIG_LINUX_RAM_BASE needs to match low mem start */
+               reg = <0x0 0x80000000 0x0 0x20000000    /* 512 MB low mem */
+                      0x1 0x00000000 0x0 0x40000000>;  /* 1 GB highmem */
        };
 
        chosen {
@@ -31,8 +33,9 @@
                #address-cells = <1>;
                #size-cells = <1>;
 
-               /* child and parent address space 1:1 mapped */
-               ranges;
+               /* only perip space at end of low mem accessible
+                         bus addr,  parent bus addr, size    */
+               ranges = <0x80000000 0x0 0x80000000 0x80000000>;
 
                core_clk: core_clk {
                        #clock-cells = <0>;
-- 
2.21.0