diff options
| -rw-r--r-- | Documentation/devicetree/bindings/arm/sunxi/smp-sram.txt | 44 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/sram/sram.yaml | 25 |
2 files changed, 25 insertions, 44 deletions
diff --git a/Documentation/devicetree/bindings/arm/sunxi/smp-sram.txt b/Documentation/devicetree/bindings/arm/sunxi/smp-sram.txt deleted file mode 100644 index 082e6a9382d3..000000000000 --- a/Documentation/devicetree/bindings/arm/sunxi/smp-sram.txt +++ /dev/null @@ -1,44 +0,0 @@ -Allwinner SRAM for smp bringup: ------------------------------------------------- - -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. - -Therefore a reserved section sub-node has to be added to the mmio-sram -declaration. - -Note that this is separate from the Allwinner SRAM controller found in -../../sram/sunxi-sram.txt. This SRAM is secure only and not mappable to -any device. - -Also there are no "secure-only" properties. The implementation should -check if this SRAM is usable first. - -Required sub-node properties: -- compatible : depending on the SoC this should be one of: - "allwinner,sun9i-a80-smp-sram" - -The rest of the properties should follow the generic mmio-sram discription -found in ../../misc/sram.txt - -Example: - - 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>; - }; - }; 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>; + }; + }; |