[PATCH v2 3/4] dt-bindings: uart-routing: Add binding for StarFive JHB100 UART routing
From: Changhuang Liang <changhuang.liang@starfivetech.com>
Date: 2026-09-05 10:29:42
Also in:
linux-aspeed, linux-devicetree, linux-doc, lkml, openbmc
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Add device tree binding for the StarFive JHB100 UART routing controller. This controller allows dynamic routing of inputs between built-in UARTs and physical serial I/O ports, enabling use cases such as Host <-> BMC communication via UARTs. The clocks property exists in the hardware, but the driver does not use it. Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com> --- .../uart-routing/starfive,uart-routing.yaml | 46 +++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/uart-routing/starfive,uart-routing.yaml
diff --git a/Documentation/devicetree/bindings/uart-routing/starfive,uart-routing.yaml b/Documentation/devicetree/bindings/uart-routing/starfive,uart-routing.yaml
new file mode 100644
index 000000000000..1977f2ed20a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/uart-routing/starfive,uart-routing.yaml@@ -0,0 +1,46 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/uart-routing/starfive,uart-routing.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: StarFive JHB100 UART Routing Controller + +maintainers: + - Changhuang Liang <changhuang.liang@starfivetech.com> + +description: | + The StarFive JHB100 UART routing controller allows dynamic routing of the + inputs for the built-in UARTs and the physical serial I/O ports. + + This allows, for example, connecting the output of one UART to another + UART, which can be used to enable Host <-> BMC communication over UARTs, + e.g. to give the BMC access to the Host's serial console. + +properties: + compatible: + const: starfive,jhb100-uart-routing + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + resets: + maxItems: 1 + +required: + - compatible + - reg + - resets + +additionalProperties: false + +examples: + - | + uart-routing@11a42a00 { + compatible = "starfive,jhb100-uart-routing"; + reg = <0x11a42a00 0x100>; + resets = <&per0crg 74>; + };
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2.25.1