Add devicetree binding for Sophgo CV1800 SoC.

Signed-off-by: Jingbao Qiu <qiujingbao.dlmu@gmail.com>
---
 .../bindings/rtc/sophgo,cv1800-rtc.yaml       | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml

diff --git a/Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml b/Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml
new file mode 100644
index 000000000000..eb86fd432053
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/sophgo,cv1800-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Real Time Clock of the Sophgo CV1800 SoC
+
+maintainers:
+  - Jingbao Qiu <qiujingbao.dlmu@gmail.com>
+
+description:
+  This is the RTC device for the CV1800 SoC. This device
+  is placed under MFD and shares an address with other devices.
+
+allOf:
+  - $ref: rtc.yaml#
+
+properties:
+  compatible:
+    const: sophgo,cv1800b-rtc
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - interrupts
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/sophgo,cv1800.h>
+
+    rtc {
+      compatible = "sophgo,cv1800b-rtc";
+      interrupts = <17 IRQ_TYPE_LEVEL_HIGH>;
+      clocks = <&clk CLK_RTC_25M>;
+    };
-- 
2.25.1

On Tue, 26 Dec 2023 18:04:29 +0800, Jingbao Qiu wrote:
> Add devicetree binding for Sophgo CV1800 SoC.
> 
> Signed-off-by: Jingbao Qiu <qiujingbao.dlmu@gmail.com>
> ---
>  .../bindings/rtc/sophgo,cv1800-rtc.yaml       | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.example.dts:25:18: fatal error: dt-bindings/clock/sophgo,cv1800.h: No such file or directory
make[2]: *** [scripts/Makefile.lib:419: Documentation/devicetree/bindings/rtc/sophgo,cv1800-rtc.example.dtb] Error 1

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20231226100431.331616-3-qiujingbao.dlmu@gmail.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.