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dt-bindings: sram: Document renesas,smp-sram 

Document reserved SRAM for the SMP jump stub on Renesas R-Car Gen2 and
RZ/G1 SoCs.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2017-07-04 17:41:35 +02:00 committed by Simon Horman
parent b2e2df8e71
commit d5f2ac6ae9
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Documentation/devicetree/bindings/sram/renesas,smp-sram.txt Normal file
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* Renesas SMP SRAM
Renesas R-Car Gen2 and RZ/G1 SoCs need a small piece of SRAM for the jump stub
for secondary CPU bringup and CPU hotplug.
This memory is reserved by adding a child node to a "mmio-sram" node, cfr.
Documentation/devicetree/bindings/sram/sram.txt.
Required child node properties:
- compatible: Must be "renesas,smp-sram",
- reg: Address and length of the reserved SRAM.
The full physical (bus) address must be aligned to a 256 KiB boundary.
Example:
icram1: sram@e63c0000 {
compatible = "mmio-sram";
reg = <0 0xe63c0000 0 0x1000>;
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0 0xe63c0000 0x1000>;
smp-sram@0 {
compatible = "renesas,smp-sram";
reg = <0 0x10>;
};
};