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[v5,07/12] ARM: mstar: Add binding details for mstar,l3bridge

Message ID 20200710094544.430258-8-daniel@0x0f.com
State Not Applicable
Headers show
Series Initial MStar/Sigmastar ARMv7 SoC support | expand

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robh/checkpatch success
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Commit Message

Daniel Palmer July 10, 2020, 9:45 a.m. UTC
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@0x0f.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../bindings/misc/mstar,l3bridge.yaml         | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/mstar,l3bridge.yaml
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Patch

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@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>;
+    };