linux-kernel - Re: [PATCH 2/8] dt-bindings: iio: adc: ad7606: Add iio backend bindings

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Message-ID: <20240815-chatter-monotone-c1a00c246d1f@spud>
Date: Thu, 15 Aug 2024 15:38:35 +0100
From: Conor Dooley <conor@...nel.org>
To: Guillaume Stols <gstols@...libre.com>
Cc: Uwe Kleine-König <ukleinek@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Jonathan Corbet <corbet@....net>, linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org,
	20240705211452.1157967-2-u.kleine-koenig@...libre.com,
	20240712171821.1470833-2-u.kleine-koenig@...libre.com,
	cover.1721040875.git.u.kleine-koenig@...libre.com,
	aardelean@...libre.com
Subject: Re: [PATCH 2/8] dt-bindings: iio: adc: ad7606: Add iio backend
 bindings

On Thu, Aug 15, 2024 at 12:11:56PM +0000, Guillaume Stols wrote:
> Add the required properties for iio-backend support, as well as an
> example and the conditions to mutually exclude interruption and
> conversion trigger with iio-backend.
> The iio-backend's function is to controls the communication, and thus the
> interruption pin won't be available anymore.
> As a consequence, the conversion pin must be controlled externally since
> we will miss information about when every single conversion cycle (i.e
> conversion + data transfert) ends, hence a PWM is introduced to trigger
> the conversions.
> 
> Signed-off-by: Guillaume Stols <gstols@...libre.com>
> ---
>  .../devicetree/bindings/iio/adc/adi,ad7606.yaml    | 75 +++++++++++++++++++++-
>  1 file changed, 72 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> index c0008d36320f..4b324f7e3207 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
> @@ -114,13 +114,28 @@ properties:
>        assumed that the pins are hardwired to VDD.
>      type: boolean
>  
> +  pwms:
> +    description:
> +      In case the conversion is triggered by a PWM instead of a GPIO plugged to
> +      the CONVST pin, the PWM must be referenced.
> +    minItems: 1
> +    maxItems: 2
> +
> +  pwm-names:
> +    minItems: 1
> +    maxItems: 2

You need to describe what the pwms are.

> +  io-backends:
> +    description:
> +      A reference to the iio-backend, which is responsible handling the BUSY
> +      pin's falling edge and communication.
> +      An example of backend can be found at
> +      http://analogdevicesinc.github.io/hdl/library/axi_ad7606x/index.html
> +
>  required:
>    - compatible
> -  - reg
>    - avcc-supply
>    - vdrive-supply
> -  - interrupts
> -  - adi,conversion-start-gpios
>  
>  # This checks if reg is a chipselect so the device is on an SPI
>  # bus, the if-clause will fail if reg is a tuple such as for a
> @@ -137,6 +152,35 @@ then:
>          - spi-cpol
>  
>  allOf:
> +  # Communication is handled either by the backend or an interrupt.

This comment seems misplaced, but also superfluous?

> +  - if:
> +      properties:
> +        pwms: false
> +    then:
> +      required:
> +        - adi,conversion-start-gpios
> +
> +  - if:
> +      properties:
> +        adi,conversion-start-gpios: false
> +    then:
> +      required:
> +        - pwms
> +
> +  - if:
> +      properties:
> +        interrupts: false
> +    then:
> +      required:
> +        - io-backends
> +
> +  - if:
> +      properties:
> +        io-backends: false
> +    then:
> +      required:
> +        - interrupts
> +
>    - if:
>        properties:
>          compatible:
> @@ -178,12 +222,37 @@ allOf:
>          adi,sw-mode: false
>      else:
>        properties:
> +        pwms:
> +          maxItems: 1
> +        pwm-names:
> +          maxItems: 1
>          adi,conversion-start-gpios:
>            maxItems: 1
>  
>  unevaluatedProperties: false
>  
>  examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    / {
> +        adi_adc {
> +                compatible = "adi,ad7606b";

Just two space indent for examples please.

Cheers,
Conor.

> +
> +                pwms = <&axi_pwm_gen 0 0>;
> +
> +                avcc-supply = <&adc_vref>;
> +                vdrive-supply = <&vdd_supply>;
> +
> +                reset-gpios = <&gpio0 91 GPIO_ACTIVE_HIGH>;
> +                standby-gpios = <&gpio0 90 GPIO_ACTIVE_LOW>;
> +                adi,range-gpios = <&gpio0 89 GPIO_ACTIVE_HIGH>;
> +                adi,oversampling-ratio-gpios = <&gpio0 88 GPIO_ACTIVE_HIGH
> +                                                &gpio0 87 GPIO_ACTIVE_HIGH
> +                                                &gpio0 86 GPIO_ACTIVE_HIGH>;
> +                io-backends = <&iio_backend>;
> +        };
> +    };
> +
>    - |
>      #include <dt-bindings/gpio/gpio.h>
>      #include <dt-bindings/interrupt-controller/irq.h>
> 
> -- 
> 2.34.1
> 

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