This adds a YAML description of the l3bridge node needed by the platform code for the MStar/SigmaStar Armv7 SoCs. Signed-off-by: Daniel Palmer <daniel@xxxxxxxx> Reviewed-by: Rob Herring <robh@xxxxxxxxxx> --- .../bindings/misc/mstar,l3bridge.yaml | 44 +++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/mstar,l3bridge.yaml diff --git a/Documentation/devicetree/bindings/misc/mstar,l3bridge.yaml b/Documentation/devicetree/bindings/misc/mstar,l3bridge.yaml new file mode 100644 index 000000000000..cb7fd1cdfb1a --- /dev/null +++ b/Documentation/devicetree/bindings/misc/mstar,l3bridge.yaml @@ -0,0 +1,44 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright 2020 thingy.jp. +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/misc/mstar,l3bridge.yaml#"; +$schema: "http://devicetree.org/meta-schemas/core.yaml#"; + +title: MStar/SigmaStar Armv7 SoC l3bridge + +maintainers: + - Daniel Palmer <daniel@xxxxxxxxx> + +description: | + MStar/SigmaStar's Armv7 SoCs have a pipeline in the interface + between the CPU and memory. This means that before DMA capable + devices are allowed to run the pipeline must be flushed to ensure + everything is in memory. + + The l3bridge region contains registers that allow such a flush + to be triggered. + + This node is used by the platform code to find where the registers + are and install a barrier that triggers the required pipeline flush. + +properties: + compatible: + items: + - const: mstar,l3bridge + + reg: + maxItems: 1 + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + l3bridge: l3bridge@1f204400 { + compatible = "mstar,l3bridge"; + reg = <0x1f204400 0x200>; + }; -- 2.27.0
