Re: [PATCH V15 2/4] dt-bindings: pwm: add IPQ6018 binding

Uwe Kleine-König
2023-10-18T20:46:31Z

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Hello,

On Thu, Oct 05, 2023 at 09:35:48PM +0530, Devi Priya wrote:
> DT binding for the PWM block in Qualcomm IPQ6018 SoC.
>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
> ---
> v15:
>
> No change
>
> v14:
>
> Picked up the R-b tag
>
> v13:
>
> Updated the file name to match the compatible
>
> Sorted the properties and updated the order in the required field
>
> Dropped the syscon node from examples
>
> v12:
>
> Picked up the R-b tag
>
> v11:
>
> No change
>
> v10:
>
> No change
>
> v9:
>
> Add 'ranges' property to example (Rob)
>
> Drop label in example (Rob)
>
> v8:
>
> Add size cell to 'reg' (Rob)
>
> v7:
>
> Use 'reg' instead of 'offset' (Rob)
>
> Drop 'clock-names' and 'assigned-clock*' (Bjorn)
>
> Use single cell address/size in example node (Bjorn)
>
> Move '#pwm-cells' lower in example node (Bjorn)
>
> List 'reg' as required
>
> v6:
>
> Device node is child of TCSR; remove phandle (Rob Herring)
>
> Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)
>
> v5: Use qcom,pwm-regs for phandle instead of direct regs (Bjorn
> Andersson, Kathiravan T)
>
> v4: Update the binding example node as well (Rob Herring's bot)
>
> v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)
>
> v2: Make #pwm-cells const (Rob Herring)
>
> .../bindings/pwm/qcom,ipq6018-pwm.yaml | 45 +++++++++++++++++++
> 1 file changed, 45 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pwm/qcom,ipq6018-pwm.yaml
>
> diff --git a/Documentation/devicetree/bindings/pwm/qcom,ipq6018-pwm.yaml b/Documentation/devicetree/bindings/pwm/qcom,ipq6018-pwm.yaml
> new file mode 100644
> index 000000000000..6d0d7ed271f7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/qcom,ipq6018-pwm.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/qcom,ipq6018-pwm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm IPQ6018 PWM controller
> +
> +maintainers:
> + - Baruch Siach <baruch@tkos.co.il>

Not being very fluent in dt and binding yaml I wonder if adding

allOf:
- $ref: pwm.yaml#

would be beneficial?!

> +properties:
> + compatible:
> + const: qcom,ipq6018-pwm
> +
> + reg:
> + description: Offset of PWM register in the TCSR block.
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + "#pwm-cells":
> + const: 2

The driver only supports normal polarity. Is this a shortcoming of the
driver, or is the hardware incapable to do that, too?

If it's only the former I'd want #pwm-cells = <3> here. For ease of use
I'd not oppose if you pick #pwm-cells = <3> even if the hardware can
only do normal polarity.

> +
> +required:
> + - compatible
> + - reg
> + - clocks
> + - "#pwm-cells"
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/qcom,gcc-ipq6018.h>
> +
> + pwm: pwm@a010 {
> + compatible = "qcom,ipq6018-pwm";
> + reg = <0xa010 0x20>;
> + clocks = <&gcc GCC_ADSS_PWM_CLK>;
> + assigned-clocks = <&gcc GCC_ADSS_PWM_CLK>;
> + assigned-clock-rates = <100000000>;
> + #pwm-cells = <2>;
> + };

Best regards
Uwe

--
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