linux-kernel - [PATCH v3 1/3] dt-bindings: serial: Add Loongson UART controller

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Message-ID: <20240826024705.55474-2-zhenghaowei@loongson.cn>
Date: Mon, 26 Aug 2024 10:47:03 +0800
From: zhenghaowei@...ngson.cn
To: zhenghaowei@...ngson.cn,
	gregkh@...uxfoundation.org,
	jirislaby@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	chenhuacai@...nel.org,
	kernel@...0n.name,
	p.zabel@...gutronix.de
Cc: linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	loongarch@...ts.linux.dev
Subject: [PATCH v3 1/3] dt-bindings: serial: Add Loongson UART controller

From: Haowei Zheng <zhenghaowei@...ngson.cn>

Add Loongson UART controller binding with DT schema format using
json-schema.

Signed-off-by: Haowei Zheng <zhenghaowei@...ngson.cn>
---
 .../bindings/serial/loongson,uart.yaml        | 63 +++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/serial/loongson,uart.yaml

Changes in V2:

- Correct the schema formatting errors.

- file name changed from 'loongson-uart.yaml' to 'loongson,ls7a-uart.yaml'

- Replace 'loongson,loongson-uart' with 'loongson,ls7a-uart'.

Changes in V3:

- Change the filename from 'loongson,ls7a-uart.yaml' to 'loongson,uart.yaml'.

- Drop newly defined features: fractional-division, rts-invert, dtr-invert,
  cts-invert and dsr-invert.

- Add three specific SoC: 'loongson,ls7a-uart', 'loongson,ls3a5000-uart' and 
  'loongson,ls2k2000-uart'.

- Drop 'LOONGSON UART DRIVER' description in MAINTAINERS.

diff --git a/Documentation/devicetree/bindings/serial/loongson,uart.yaml b/Documentation/devicetree/bindings/serial/loongson,uart.yaml
new file mode 100644
index 000000000000..19a65dd5be9f
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/loongson,uart.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/loongson,uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson UART
+
+maintainers:
+  - Haowei Zheng <zhenghaowei@...ngson.cn>
+
+allOf:
+  - $ref: serial.yaml
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - loongson,ls7a-uart
+          - loongson,ls3a5000-uart
+          - loongson,ls2k2000-uart
+      - items:
+          - enum:
+              - loongson,ls2k1000-uart
+              - loongson,ls2k0500-uart
+          - const: loongson,ls7a-uart
+      - items:
+          - enum:
+              - loongson,ls2k1500-uart
+          - const: loongson,ls2k2000-uart
+      - items:
+          - enum:
+              - loongson,ls3a6000-uart
+          - const: loongson,ls3a5000-uart
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clock-frequency: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clock-frequency
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/loongson,ls2k-clk.h>
+
+    serial@...20000 {
+        compatible = "loongson,ls2k1000-uart", "loongson,ls7a-uart";
+        reg = <0x1fe20000 0x10>;
+        clock-frequency = <125000000>;
+        interrupt-parent = <&liointc0>;
+        interrupts = <0x0 IRQ_TYPE_LEVEL_HIGH>;
+    };
-- 
2.43.0