[v9,2/5] dt-bindings: net: can: add STM32 bxcan DT bindings

Message ID 20230327201630.3874028-3-dario.binacchi@amarulasolutions.com
State New
Headers show
Series
  • can: bxcan: add support for ST bxCAN controller
Related show

Commit Message

Dario Binacchi March 27, 2023, 8:16 p.m. UTC
Add documentation of device tree bindings for the STM32 basic extended
CAN (bxcan) controller.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Rob Herring <robh@kernel.org>

---

Changes in v9:
- Replace master/slave terms with primary/secondary.

Changes in v5:
- Add Rob Herring's Reviewed-by tag.

Changes in v4:
- Remove "st,stm32f4-bxcan-core" compatible. In this way the can nodes
 (compatible "st,stm32f4-bxcan") are no longer children of a parent
  node with compatible "st,stm32f4-bxcan-core".
- Add the "st,gcan" property (global can memory) to can nodes which
  references a "syscon" node containing the shared clock and memory
  addresses.

Changes in v3:
- Remove 'Dario Binacchi <dariobin@libero.it>' SOB.
- Add description to the parent of the two child nodes.
- Move "patterProperties:" after "properties: in top level before "required".
- Add "clocks" to the "required:" list of the child nodes.

Changes in v2:
- Change the file name into 'st,stm32-bxcan-core.yaml'.
- Rename compatibles:
  - st,stm32-bxcan-core -> st,stm32f4-bxcan-core
  - st,stm32-bxcan -> st,stm32f4-bxcan
- Rename master property to st,can-master.
- Remove the status property from the example.
- Put the node child properties as required.

 .../bindings/net/can/st,stm32-bxcan.yaml      | 85 +++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml

Comments

Rob Herring March 28, 2023, 1:53 a.m. UTC | #1
On Mon, 27 Mar 2023 22:16:27 +0200, Dario Binacchi wrote:
> Add documentation of device tree bindings for the STM32 basic extended
> CAN (bxcan) controller.
> 
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> 
> ---
> 
> Changes in v9:
> - Replace master/slave terms with primary/secondary.
> 
> Changes in v5:
> - Add Rob Herring's Reviewed-by tag.
> 
> Changes in v4:
> - Remove "st,stm32f4-bxcan-core" compatible. In this way the can nodes
>  (compatible "st,stm32f4-bxcan") are no longer children of a parent
>   node with compatible "st,stm32f4-bxcan-core".
> - Add the "st,gcan" property (global can memory) to can nodes which
>   references a "syscon" node containing the shared clock and memory
>   addresses.
> 
> Changes in v3:
> - Remove 'Dario Binacchi <dariobin@libero.it>' SOB.
> - Add description to the parent of the two child nodes.
> - Move "patterProperties:" after "properties: in top level before "required".
> - Add "clocks" to the "required:" list of the child nodes.
> 
> Changes in v2:
> - Change the file name into 'st,stm32-bxcan-core.yaml'.
> - Rename compatibles:
>   - st,stm32-bxcan-core -> st,stm32f4-bxcan-core
>   - st,stm32-bxcan -> st,stm32f4-bxcan
> - Rename master property to st,can-master.
> - Remove the status property from the example.
> - Put the node child properties as required.
> 
>  .../bindings/net/can/st,stm32-bxcan.yaml      | 85 +++++++++++++++++++
>  1 file changed, 85 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.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:
./Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml:27:11: [error] syntax error: mapping values are not allowed here (syntax)

dtschema/dtc warnings/errors:
make[1]: *** Deleting file 'Documentation/devicetree/bindings/net/can/st,stm32-bxcan.example.dts'
Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml:27:11: mapping values are not allowed here
make[1]: *** [Documentation/devicetree/bindings/Makefile:26: Documentation/devicetree/bindings/net/can/st,stm32-bxcan.example.dts] Error 1
make[1]: *** Waiting for unfinished jobs....
./Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml:27:11: mapping values are not allowed here
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml: ignoring, error parsing file
make: *** [Makefile:1512: dt_binding_check] Error 2

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230327201630.3874028-3-dario.binacchi@amarulasolutions.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.

Patch

diff --git a/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
new file mode 100644
index 000000000000..ca97ba3c2b05
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
@@ -0,0 +1,85 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/can/st,stm32-bxcan.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics bxCAN controller
+
+description: STMicroelectronics BxCAN controller for CAN bus
+
+maintainers:
+  - Dario Binacchi <dario.binacchi@amarulasolutions.com>
+
+allOf:
+  - $ref: can-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - st,stm32f4-bxcan
+
+  st,can-primary:
+    description:
+      Primary and secondary mode of the bxCAN peripheral is only relevant
+      if the chip has two CAN peripherals. In that case they share some
+      of the required logic.
+      Note: The ST documentation uses master/slave terms instead of
+      primary/secondary.
+    type: boolean
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: transmit interrupt
+      - description: FIFO 0 receive interrupt
+      - description: FIFO 1 receive interrupt
+      - description: status change error interrupt
+
+  interrupt-names:
+    items:
+      - const: tx
+      - const: rx0
+      - const: rx1
+      - const: sce
+
+  resets:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  st,gcan:
+    $ref: "/schemas/types.yaml#/definitions/phandle-array"
+    description:
+      The phandle to the gcan node which allows to access the 512-bytes
+      SRAM memory shared by the two bxCAN cells (CAN1 primary and CAN2
+      secondary) in dual CAN peripheral configuration.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - resets
+  - clocks
+  - st,gcan
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/stm32fx-clock.h>
+    #include <dt-bindings/mfd/stm32f4-rcc.h>
+
+    can1: can@40006400 {
+        compatible = "st,stm32f4-bxcan";
+        reg = <0x40006400 0x200>;
+        interrupts = <19>, <20>, <21>, <22>;
+        interrupt-names = "tx", "rx0", "rx1", "sce";
+        resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
+        clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
+        st,can-primary;
+        st,gcan = <&gcan>;
+    };