linux-kernel - Re: [PATCH v5 4/6] dt-bindings: iio: dac: Add adi,ltc2664.yaml

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Message-ID: <20240702-septic-cake-f839ff7048a9@spud>
Date: Tue, 2 Jul 2024 16:08:05 +0100
From: Conor Dooley <conor@...nel.org>
To: Kim Seer Paller <kimseer.paller@...log.com>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Dimitri Fedrau <dima.fedrau@...il.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Nuno Sá <noname.nuno@...il.com>
Subject: Re: [PATCH v5 4/6] dt-bindings: iio: dac: Add adi,ltc2664.yaml

On Tue, Jul 02, 2024 at 11:00:23AM +0800, Kim Seer Paller wrote:
> +  adi,manual-span-operation-config:
> +    description:
> +      This property must mimic the MSPAN pin configurations. By tying the MSPAN
> +      pins (MSP2, MSP1 and MSP0) to GND and/or VCC, any output range can be
> +      hardware-configured with different mid-scale or zero-scale reset options.
> +      The hardware configuration is latched during power on reset for proper
> +      operation.
> +        0 - MPS2=GND, MPS1=GND, MSP0=GND (+-10V, reset to 0V)
> +        1 - MPS2=GND, MPS1=GND, MSP0=VCC (+-5V, reset to 0V)
> +        2 - MPS2=GND, MPS1=VCC, MSP0=GND (+-2.5V, reset to 0V)
> +        3 - MPS2=GND, MPS1=VCC, MSP0=VCC (0V to 10, reset to 0V)
> +        4 - MPS2=VCC, MPS1=GND, MSP0=GND (0V to 10V, reset to 5V)
> +        5 - MPS2=VCC, MPS1=GND, MSP0=VCC (0V to 5V, reset to 0V)
> +        6 - MPS2=VCC, MPS1=VCC, MSP0=GND (0V to 5V, reset to 2.5V)
> +        7 - MPS2=VCC, MPS1=VCC, MSP0=VCC (0V to 5V, reset to 0V, enables SoftSpan)
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2, 3, 4, 5, 6, 7]
> +    default: 7

I still don't like this property, but I still don't really understand
some of the iteraction between it and the output ranges and cannot
suggest anything better, so
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

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