On Tue, Dec 21, 2021 at 06:21:11PM +0530, Sumit Gupta wrote:
Add device-tree binding documentation to represent the axi2apb bridges
used by Control Backbone (CBB) 1.0 in Tegra194 SOC. All errors for APB
slaves are reported as slave error because APB bas single bit to report
error. So, CBB driver needs to further check error status registers of
all the axi2apb bridges to find error type.
Signed-off-by: Sumit Gupta <sumitg@xxxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
.../arm/tegra/nvidia,tegra194-axi2apb.yaml | 40 +++++++++++++++++++
1 file changed, 40 insertions(+)
create mode 100644 Documentation/devicetree/bindings/arm/tegra/nvidia,tegra194-axi2apb.yaml
diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra194-axi2apb.yaml b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra194-axi2apb.yaml
new file mode 100644
index 000000000000..788a13f8aa93
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra194-axi2apb.yaml
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/arm/tegra/nvidia,tegra194-axi2apb.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: NVIDIA Tegra194 AXI2APB bridge
+
+maintainers:
+ - Sumit Gupta <sumitg@xxxxxxxxxx>
+
+properties:
+ $nodename:
+ pattern: "^axi2apb@([0-9a-f]+)$"
+
+ compatible:
+ enum:
+ - nvidia,tegra194-axi2apb
+
+ reg:
+ maxItems: 6
+ description: Physical base address and length of registers for all bridges
+
+additionalProperties: false
+
+required:
+ - compatible
+ - reg
+
+examples:
+ - |
+ axi2apb: axi2apb@2390000 {
As axi2apb appears to be a bus, then all the child nodes (APB devices)
should be under this node.
All the cbb noc nodes in T194 and fabric nodes in T234 are under "bus@0" node.
Is NVidia still putting all the devices at the root level rather than
under a bus node which is preferred?
+ compatible = "nvidia,tegra194-axi2apb";
+ reg = <0x02390000 0x1000>,
+ <0x023a0000 0x1000>,
+ <0x023b0000 0x1000>,
+ <0x023c0000 0x1000>,
+ <0x023d0000 0x1000>,
+ <0x023e0000 0x1000>;
+ };
--
2.17.1