linux-kernel - Re: [PATCH v2 1/3] dt-bindings: iio: adc: sophgo,cv18xx-saradc.yaml: Add Sophgo SARADC binding documentation

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Message-ID: <20240705-unaired-pesticide-4135eaa04212@spud>
Date: Fri, 5 Jul 2024 16:01:17 +0100
From: Conor Dooley <conor@...nel.org>
To: Thomas Bonnefille <thomas.bonnefille@...tlin.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Inochi Amaoto <inochiama@...look.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Miquèl Raynal <miquel.raynal@...tlin.com>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 1/3] dt-bindings: iio: adc: sophgo,cv18xx-saradc.yaml:
 Add Sophgo SARADC binding documentation

On Fri, Jul 05, 2024 at 03:42:23PM +0200, Thomas Bonnefille wrote:
> The Sophgo SARADC is a Successive Approximation ADC that can be found in
> the Sophgo SoC.
> 
> Signed-off-by: Thomas Bonnefille <thomas.bonnefille@...tlin.com>
> ---
>  .../bindings/iio/adc/sophgo,cv18xx-saradc.yaml     | 63 ++++++++++++++++++++++
>  1 file changed, 63 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/sophgo,cv18xx-saradc.yaml b/Documentation/devicetree/bindings/iio/adc/sophgo,cv18xx-saradc.yaml
> new file mode 100644
> index 000000000000..31bd8ac6dfa5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/sophgo,cv18xx-saradc.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/sophgo,cv18xx-saradc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title:
> +  Sophgo CV18XX SoC series 3 channels Successive Approximation Analog to
> +  Digital Converters
> +
> +maintainers:
> +  - Thomas Bonnefille <thomas.bonnefille@...tlin.com>
> +
> +description:
> +  Datasheet at https://github.com/sophgo/sophgo-doc/releases
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - enum:
> +              - sophgo,cv1800b-saradc
> +          - const: sophgo,cv18xx-saradc

I don't think the fallback here makes sense. If there's other devices
with a compatible programming model added later, we can fall back to the
cv1800b.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      SARADC will use the presence of this clock to determine if the controller
> +      needs to be explicitly clocked by it (Active domain) or if it is part of
> +      the No-Die Domain, along with the RTC, which does not require explicit
> +      clocking.

What does "explicit clocking" mean? Is it clocked directly (or via
dividers) by a clock on the board or another source?

Cheers,
Conor.

> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/sophgo,cv1800.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    /* ADC in the Active domain */
> +    adc@...0000 {
> +        compatible = "sophgo,cv1800b-saradc", "sophgo,cv18xx-saradc";
> +        clocks = <&clk CLK_SARADC>;
> +        interrupts = <100 IRQ_TYPE_LEVEL_HIGH>;
> +        reg = <0x030F0000 0x1000>;
> +    };
> +  - |
> +    #include <dt-bindings/clock/sophgo,cv1800.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    /* ADC in the No-Die domain */
> +    adc@...c000 {
> +        compatible = "sophgo,cv1800b-saradc", "sophgo,cv18xx-saradc";
> +        reg = <0x0502C000 0x1000>;
> +    };
> 
> -- 
> 2.45.2
> 

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