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+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/snps-dw-apb-uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys DesignWare ABP UART
+
+maintainers:
+ - Rob Herring <robh@kernel.org>
+
+allOf:
+ - $ref: /schemas/serial.yaml#
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - renesas,r9a06g032-uart
+ - renesas,r9a06g033-uart
+ - const: renesas,rzn1-uart
+ - items:
+ - enum:
+ - rockchip,px30-uart
+ - rockchip,rk3036-uart
+ - rockchip,rk3066-uart
+ - rockchip,rk3188-uart
+ - rockchip,rk3288-uart
+ - rockchip,rk3328-uart
+ - rockchip,rk3368-uart
+ - rockchip,rk3399-uart
+ - rockchip,rv1108-uart
+ - const: snps,dw-apb-uart
+ - items:
+ - enum:
+ - brcm,bcm11351-dw-apb-uart
+ - brcm,bcm21664-dw-apb-uart
+ - const: snps,dw-apb-uart
+ - const: snps,dw-apb-uart
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ clock-frequency: true
+
+ clocks:
+ minItems: 1
+ maxItems: 2
+
+ clock-names:
+ items:
+ - const: baudclk
+ - const: apb_pclk
+
+ snps,uart-16550-compatible:
+ description: reflects the value of UART_16550_COMPATIBLE configuration
+ parameter. Define this if your UART does not implement the busy functionality.
+ type: boolean
+
+ resets:
+ maxItems: 1
+
+ reg-shift: true
+
+ reg-io-width: true
+
+ dcd-override:
+ description: Override the DCD modem status signal. This signal will
+ always be reported as active instead of being obtained from the modem
+ status register. Define this if your serial port does not use this
+ pin.
+ type: boolean
+
+ dsr-override:
+ description: Override the DTS modem status signal. This signal will
+ always be reported as active instead of being obtained from the modem
+ status register. Define this if your serial port does not use this
+ pin.
+ type: boolean
+
+ cts-override:
+ description: Override the CTS modem status signal. This signal will
+ always be reported as active instead of being obtained from the modem
+ status register. Define this if your serial port does not use this
+ pin.
+ type: boolean
+
+ ri-override:
+ description: Override the RI modem status signal. This signal will always
+ be reported as inactive instead of being obtained from the modem status
+ register. Define this if your serial port does not use this pin.
+ type: boolean
+
+required:
+ - compatible
+ - reg
+ - interrupts
+
+examples:
+ - |
+ serial@80230000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x80230000 0x100>;
+ clock-frequency = <3686400>;
+ interrupts = <10>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ dcd-override;
+ dsr-override;
+ cts-override;
+ ri-override;
+ };
+
+ - |
+ // Example with one clock:
+ serial@80230000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x80230000 0x100>;
+ clocks = <&baudclk>;
+ interrupts = <10>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ };
+
+ - |
+ // Example with two clocks:
+ serial@80230000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x80230000 0x100>;
+ clocks = <&baudclk>, <&apb_pclk>;
+ clock-names = "baudclk", "apb_pclk";
+ interrupts = <10>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ };
+...