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authorKrzysztof Kozlowski <krzk@kernel.org>2019-10-21 18:13:50 +0200
committerRob Herring <robh@kernel.org>2019-10-28 19:40:47 -0500
commit517bcde22c214612b86f4795e2c9d7df9b08cd54 (patch)
tree6968cc60e6877a4c813e9fa0b142a5984a2cacb5 /Documentation/devicetree/bindings/sram
parent1a4d47af071453c65e27f2f6e32084a3550c4f16 (diff)
dt-bindings: sram: Merge Allwinner SRAM bindings into generic
The Allwinner SRAM bindings list only compatible so integrate them into generic SRAM bindings schema. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/sram')
-rw-r--r--Documentation/devicetree/bindings/sram/sram.yaml25
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sram/sram.yaml b/Documentation/devicetree/bindings/sram/sram.yaml
index 950043835ebb..59a4e0790f2b 100644
--- a/Documentation/devicetree/bindings/sram/sram.yaml
+++ b/Documentation/devicetree/bindings/sram/sram.yaml
@@ -65,6 +65,7 @@ patternProperties:
Should contain a vendor specific string in the form
<vendor>,[<device>-]<usage>
enum:
+ - allwinner,sun9i-a80-smp-sram
- amlogic,meson8-smp-sram
- amlogic,meson8b-smp-sram
- renesas,smp-sram
@@ -215,3 +216,27 @@ examples:
reg = <0x10080000 0x50>;
};
};
+
+ - |
+ // Allwinner's A80 SoC uses part of the secure sram for hotplugging of the
+ // primary core (cpu0). Once the core gets powered up it checks if a magic
+ // value is set at a specific location. If it is then the BROM will jump
+ // to the software entry address, instead of executing a standard boot.
+ //
+ // Also there are no "secure-only" properties. The implementation should
+ // check if this SRAM is usable first.
+ 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>;
+ };
+ };