linux-kernel - Re: [PATCH 1/3] dt-bindings: pwm: add support for MC33XS2410

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Message-ID: <6dd18b29-6e45-4c35-8f7e-5248b057449d@linaro.org>
Date: Wed, 28 Feb 2024 14:59:48 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Dimitri Fedrau <dima.fedrau@...il.com>
Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-pwm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: pwm: add support for MC33XS2410

On 28/02/2024 14:32, Dimitri Fedrau wrote:
> Adding documentation for MC33XS2410 pwm driver.

Driver as Linux driver? If so, please rephrase to describe hardware.

> 
> Signed-off-by: Dimitri Fedrau <dima.fedrau@...il.com>
> ---
>  .../bindings/pwm/nxp,mc33xs2410.yaml          | 105 ++++++++++++++++++
>  1 file changed, 105 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pwm/nxp,mc33xs2410.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pwm/nxp,mc33xs2410.yaml b/Documentation/devicetree/bindings/pwm/nxp,mc33xs2410.yaml
> new file mode 100644
> index 000000000000..bd387dbe69be
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/nxp,mc33xs2410.yaml
> @@ -0,0 +1,105 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/nxp,mc33xs2410.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MC33XS2410 PWM driver

Driver as Linux driver? If so, please rephrase to describe hardware.

> +
> +maintainers:
> +  - Dimitri Fedrau <dima.fedrau@...il.com>
> +
> +allOf:
> +  - $ref: pwm.yaml#
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    const: nxp,mc33xs2410
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 10000000
> +
> +  spi-cpha: true
> +
> +  spi-cs-setup-delay-ns:
> +    minimum: 100
> +    default: 100
> +
> +  spi-cs-hold-delay-ns:
> +    minimum: 10
> +    default: 10
> +
> +  spi-cs-inactive-delay-ns:
> +    minimum: 300
> +    default: 300
> +
> +  reset-gpios:
> +    description:
> +      GPIO connected to the active low reset pin.
> +    maxItems: 1
> +
> +  "#pwm-cells":
> +    const: 3
> +
> +  pwms:
> +    description:
> +      Direct inputs(di0-3) are used to directly turn-on or turn-off the
> +      outputs. The external PWM clock can be used if the internal clock
> +      doesn't meet timing requirements.

pwm is input for pwm?

> +    maxItems: 5
> +
> +  pwm-names:
> +    items:
> +      - const: di0
> +      - const: di1
> +      - const: di2
> +      - const: di3
> +      - const: ext_clk

Aren't these clocks?

> +
> +  vdd-supply:
> +    description:
> +      Logic supply voltage
> +
> +  vspi-supply:
> +    description:
> +      Supply voltage for SPI
> +
> +  vpwr-supply:
> +    description:
> +      Power switch supply
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false

Instead:
unevaluatedProperties: false

> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +       pwm@0 {
> +           compatible = "nxp,mc33xs2410";
> +           reg = <0x0>;
> +           spi-max-frequency = <4000000>;
> +           spi-cpha;
> +           spi-cs-setup-delay-ns = <100>;
> +           spi-cs-hold-delay-ns = <10>;
> +           spi-cs-inactive-delay-ns = <300>;
> +           reset-gpios = <&gpio3 22 GPIO_ACTIVE_LOW>;
> +           #pwm-cells = <3>;

Make example complete, so provide all properties, like interrupts, pwms
and whatever you have in the binding.

Best regards,
Krzysztof