On Wed, Jul 12, 2017 at 12:40:23PM +0300, Eugeniy Paltsev wrote:

From: Alexey Brodkin <abrodkin-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>

This initial port adds support of ARC HS Development Kit board with some
basic features such serial port, USB, SD/MMC and Ethernet.

Essentially we run Linux kernel on all 4 cores (i.e. utilize SMP) and
heavily use IO Coherency for speeding-up DMA-aware peripherals.

Note as opposed to other ARC boards we link Linux kernel to
0x9000_0000 intentionally because cores 1 and 3 configured with DCCM
situated at our more usual link base 0x8000_0000. We still can use
memory region starting at 0x8000_0000 as we reallocate DCCM in our
platform code.

Note that PAE remapping for DMA clients does not work due to an RTL bug,
so CREG_PAE register must be programmed to all zeroes, otherwise it will
cause problems with DMA to/from peripherals even if PAE40 is not used.

Signed-off-by: Alexey Brodkin <abrodkin-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev-HKixBCOQz3hWk0Htik3J/w@public.gmane.org>
---
Changes v7 -> v8:
 * DTS: move cpu_intc, idu_intc, arcpct, timer, gfrc nodes to root
   level and out of the cpus node.
 * DTS: add vendor-specific compatible for ohci and ehci nodes.
 * DTS: style fixes

Acked-by: Rob Herring <redacted>

+		ohci@60000 {
+			compatible = "snps,hsdk-v1.0-ohci", "generic-ohci";
+			reg = <0x60000 0x100>;
+			interrupts = <15>;
+		};
+
+		ehci@40000 {
+			compatible = "snps,hsdk-v1.0-ehci", "generic-ehci";
+			reg = <0x40000 0x100>;
+			interrupts = <15>;
+		};

Of course, now these compatibles need to be documented. You can do that 
in a separate follow-up patch.

Rob
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