linux-kernel - Re: [PATCH 1/2] dt-bindings: iio: adc: ti-ads1298: Add driver

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Message-ID: <20231213-diffuser-disposal-ea21bbce8b64@spud>
Date:   Wed, 13 Dec 2023 16:23:43 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Mike Looijmans <mike.looijmans@...ic.nl>
Cc:     devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: iio: adc: ti-ads1298: Add driver

On Wed, Dec 13, 2023 at 10:47:21AM +0100, Mike Looijmans wrote:
> Skeleton driver for the TI ADS1298 medical ADC. This device is
> typically used for ECG and similar measurements. Supports data
> acquisition at configurable scale and sampling frequency.

I think the commit subject and body here were accidentally copy-pasted
from the driver patch. Patches for bindings should avoid talking about
drivers and focus on the harware (unless we are talking about LEDs or
motors etc)

> 
> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
> 
> ---
> 
>  .../bindings/iio/adc/ti,ads1298.yaml          | 80 +++++++++++++++++++
>  1 file changed, 80 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads1298.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads1298.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads1298.yaml
> new file mode 100644
> index 000000000000..7a160ba721eb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/ti,ads1298.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/ti,ads1298.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Texas Instruments' ads1298 medical ADC chips
> +
> +maintainers:
> +  - Mike Looijmans <mike.looijmans@...ic.nl>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,ads1298
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-cpha: true
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  avdd-supply:
> +    description:
> +      Analog power supply, voltage between AVDD and AVSS. When providing a
> +      symmetric +/- 2.5V, the regulator should report 5V.
> +
> +  vref-supply:
> +    description:
> +      Optional reference voltage. If omitted, internal reference is used,
> +      depending on analog supply this is 2.4 or 4V.

It may be worth mentioning here what the conditions for the internal
reference being 2.4 or 4 volts actually are.

> +
> +  clocks:
> +    description: Optional 2.048 MHz external source clock on CLK pin
> +    maxItems: 1
> +
> +  clock-names:
> +    const: clk

Since you have only one clock, having clock-names (especially with a
name like "clk") is pointless IMO.

Generally though, this patch looks good to me.

Cheers,
Conor.

> +  interrupts:
> +    description: Interrupt on DRDY pin, triggers on falling edge
> +    maxItems: 1
> +
> +  label: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - avdd-supply
> +  - interrupts
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        adc@1 {
> +          reg = <1>;
> +          compatible = "ti,ads1298";
> +          label = "ads1298-1-ecg";
> +          avdd-supply = <&reg_iso_5v_a>;
> +          clock-names = "clk";
> +          clocks = <&clk_ads1298>;
> +          interrupt-parent = <&gpio0>;
> +          interrupts = <78 IRQ_TYPE_EDGE_FALLING>;
> +          spi-max-frequency = <20000000>;
> +          spi-cpha;
> +        };
> +    };
> +...
> -- 
> 2.34.1
> 
> 
> Met vriendelijke groet / kind regards,
> 
> Mike Looijmans
> System Expert
> 
> 
> TOPIC Embedded Products B.V.
> Materiaalweg 4, 5681 RJ Best
> The Netherlands
> 
> T: +31 (0) 499 33 69 69
> E: mike.looijmans@...ic.nl
> W: www.topic.nl
> 
> Please consider the environment before printing this e-mail

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