Add device tree binding document for the IPMB device interface.
This device is already in use in both driver and .dts files.

Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
---
 .../devicetree/bindings/ipmi/ipmb-dev.yaml    | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ipmi/ipmb-dev.yaml

diff --git a/Documentation/devicetree/bindings/ipmi/ipmb-dev.yaml b/Documentation/devicetree/bindings/ipmi/ipmb-dev.yaml
new file mode 100644
index 000000000000..21c5aaf427d7
--- /dev/null
+++ b/Documentation/devicetree/bindings/ipmi/ipmb-dev.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ipmi/ipmb-dev.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: The Intelligent Platform Management Bus(IPMB) Device
+
+description: |
+  The IPMB is an I2C bus which provides interconnection between a Baseboard
+  Management Controller(BMC) and chassis electronics. The BMC sends IPMI
+  requests to intelligent controllers like Satellite Management Controller(MC)
+  devices via IPMB and the device sends responses back to the BMC.
+  This device uses an I2C slave device to send and receive IPMB messages,
+  either on a BMC or other MC. A miscellaneous device provices a user space
+  program to communicate with the kernel and the backend device. Some IPMB
+  devices only support the I2C protocol and not the SMB protocol.
+
+  IPMB communications protocol Specification V1.0
+  https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ipmp-spec-v1.0.pdf
+
+maintainers:
+  - Ninad Palsule <ninad@linux.ibm.com>
+
+properties:
+  compatible:
+    enum:
+      - ipmb-dev
+
+  reg:
+    maxItems: 1
+
+  i2c-protocol:
+    description:
+      Use I2C block transfer instead of SMBUS block transfer.
+    type: boolean
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ipmb-dev@10 {
+            compatible = "ipmb-dev";
+            reg = <(0x10 | I2C_OWN_SLAVE_ADDRESS)>;
+            i2c-protocol;
+        };
+    };
-- 
2.43.0

On Tue, 14 Jan 2025 16:01:36 -0600, Ninad Palsule wrote:
> Add device tree binding document for the IPMB device interface.
> This device is already in use in both driver and .dts files.
> 
> Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
> ---
>  .../devicetree/bindings/ipmi/ipmb-dev.yaml    | 55 +++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/ipmi/ipmb-dev.yaml
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
Error: Documentation/devicetree/bindings/ipmi/ipmb-dev.example.dts:24.32-33 syntax error
FATAL ERROR: Unable to parse input tree
make[2]: *** [scripts/Makefile.dtbs:131: Documentation/devicetree/bindings/ipmi/ipmb-dev.example.dtb] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/builds/robherring/dt-review-ci/linux/Makefile:1506: dt_binding_check] Error 2
make: *** [Makefile:251: __sub-make] Error 2

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20250114220147.757075-3-ninad@linux.ibm.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.