[v4,1/3] dt-bindings: pwm: Add binding for Allwinner D1/T113-S3/R329 PWM controller

Commit Message

Aleksandr Shubin Aug. 10, 2023, 2:54 p.m. UTC

Allwinner's D1, T113-S3 and R329 SoCs have a new pwm
controller witch is different from the previous pwm-sun4i.

The D1 and T113 are identical in terms of peripherals,
they differ only in the architecture of the CPU core, and
even share the majority of their DT. Because of that,
using the same compatible makes sense.
The R329 is a different SoC though, and should have
a different compatible string added, especially as there
is a difference in the number of channels.

D1 and T113s SoCs have one PWM controller with 8 channels.
R329 SoC has two PWM controllers in both power domains, one of
them has 9 channels (CPUX one) and the other has 6 (CPUS one).

Add a device tree binding for them.

Signed-off-by: Aleksandr Shubin <[e-mail]>
---
 .../bindings/pwm/allwinner,sun20i-pwm.yaml    | 86 +++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.yaml

Comments

Conor Dooley Aug. 10, 2023, 4:12 p.m. UTC | #1

On Thu, Aug 10, 2023 at 05:54:26PM +0300, Aleksandr Shubin wrote:

> +allOf:
> +  - $ref: pwm.yaml#
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: allwinner,sun20i-r329-pwm
> +
> +    then:
> +      required:
> +        - allwinner,pwm-channels
> +
> +    else:
> +      not:
> +        required:
> +          - allwinner,pwm-channels

Hmm, I realise I lead you astray a little. This can be reduced to
    else:
      properties:
        allwinner,pwm-channels: false

If you respin, please update to that. Otherwise,
Reviewed-by: Conor Dooley <[e-mail]>

Thanks,
Conor.

Rob Herring (Arm) Aug. 10, 2023, 4:21 p.m. UTC | #2

On Thu, 10 Aug 2023 17:54:26 +0300, Aleksandr Shubin wrote:
> Allwinner's D1, T113-S3 and R329 SoCs have a new pwm
> controller witch is different from the previous pwm-sun4i.
> 
> The D1 and T113 are identical in terms of peripherals,
> they differ only in the architecture of the CPU core, and
> even share the majority of their DT. Because of that,
> using the same compatible makes sense.
> The R329 is a different SoC though, and should have
> a different compatible string added, especially as there
> is a difference in the number of channels.
> 
> D1 and T113s SoCs have one PWM controller with 8 channels.
> R329 SoC has two PWM controllers in both power domains, one of
> them has 9 channels (CPUX one) and the other has 6 (CPUS one).
> 
> Add a device tree binding for them.
> 
> Signed-off-by: Aleksandr Shubin <[e-mail]>
> ---
>  .../bindings/pwm/allwinner,sun20i-pwm.yaml    | 86 +++++++++++++++++++
>  1 file changed, 86 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.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:


doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/[e-mail]

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.

Rob Herring (Arm) Aug. 10, 2023, 9:20 p.m. UTC | #3

On Thu, Aug 10, 2023 at 10:21:30AM -0600, Rob Herring wrote:
> 
> On Thu, 10 Aug 2023 17:54:26 +0300, Aleksandr Shubin wrote:
> > Allwinner's D1, T113-S3 and R329 SoCs have a new pwm
> > controller witch is different from the previous pwm-sun4i.
> > 
> > The D1 and T113 are identical in terms of peripherals,
> > they differ only in the architecture of the CPU core, and
> > even share the majority of their DT. Because of that,
> > using the same compatible makes sense.
> > The R329 is a different SoC though, and should have
> > a different compatible string added, especially as there
> > is a difference in the number of channels.
> > 
> > D1 and T113s SoCs have one PWM controller with 8 channels.
> > R329 SoC has two PWM controllers in both power domains, one of
> > them has 9 channels (CPUX one) and the other has 6 (CPUS one).
> > 
> > Add a device tree binding for them.
> > 
> > Signed-off-by: Aleksandr Shubin <[e-mail]>
> > ---
> >  .../bindings/pwm/allwinner,sun20i-pwm.yaml    | 86 +++++++++++++++++++
> >  1 file changed, 86 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.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:
> 
> 
> doc reference errors (make refcheckdocs):
> 
> See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/[e-mail]

The bot was having an issue. This can be ignored.

Rob

Patch

diff --git a/Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.yaml b/Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.yaml
new file mode 100644
index 000000000000..4e6eaa18f342
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.yaml
@@ -0,0 +1,86 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/allwinner,sun20i-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner D1, T113-S3 and R329 PWM
+
+maintainers:
+  - Aleksandr Shubin <[e-mail]>
+
+properties:
+  compatible:
+    oneOf:
+      - const: allwinner,sun20i-d1-pwm
+      - items:
+          - const: allwinner,sun20i-r329-pwm
+          - const: allwinner,sun20i-d1-pwm
+
+  reg:
+    maxItems: 1
+
+  "#pwm-cells":
+    const: 3
+
+  clocks:
+    items:
+      - description: 24 MHz oscillator
+      - description: Bus Clock
+
+  clock-names:
+    items:
+      - const: hosc
+      - const: bus
+
+  resets:
+    maxItems: 1
+
+  allwinner,pwm-channels:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: The number of PWM channels configured for this instance
+    enum: [6, 9]
+
+allOf:
+  - $ref: pwm.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: allwinner,sun20i-r329-pwm
+
+    then:
+      required:
+        - allwinner,pwm-channels
+
+    else:
+      not:
+        required:
+          - allwinner,pwm-channels
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - "#pwm-cells"
+  - clocks
+  - clock-names
+  - resets
+
+examples:
+  - |
+    #include <dt-bindings/clock/sun20i-d1-ccu.h>
+    #include <dt-bindings/reset/sun20i-d1-ccu.h>
+
+    pwm: pwm@2000c00 {
+      compatible = "allwinner,sun20i-d1-pwm";
+      reg = <0x02000c00 0x400>;
+      clocks = <&dcxo>, <&ccu CLK_BUS_PWM>;
+      clock-names = "hosc", "bus";
+      resets = <&ccu RST_BUS_PWM>;
+      #pwm-cells = <0x3>;
+    };
+
+...