ARM: mstar: Add binding details for mstar,l3bridge

# 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@thingy.jp>

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>;

    };