linux-kernel - Re: [PATCH v3 18/27] staging: iio: resolver: ad2s1210: convert resolution to devicetree property

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Date:   Sat, 30 Sep 2023 16:15:43 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     David Lechner <dlechner@...libre.com>
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        David Lechner <david@...hnology.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Axel Haslam <ahaslam@...libre.com>,
        Philip Molloy <pmolloy@...libre.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 18/27] staging: iio: resolver: ad2s1210: convert
 resolution to devicetree property

On Fri, 29 Sep 2023 12:23:23 -0500
David Lechner <dlechner@...libre.com> wrote:

> From: David Lechner <david@...hnology.com>
> 
> From: David Lechner <dlechner@...libre.com>
> 
> Selecting the resolution was implemented as the `bits` sysfs attribute.
> However, the selection of the resolution depends on how the hardware
> is wired and the specific application, so this is rather a job for
> devicetree to describe.
> 
> A new devicetree property `adi,resolution` to specify the resolution
> required for each chip is added and the `bits` sysfs attribute is
> removed.

Description need updating to reflect property having a different name.

Otherwise this LGTM
> 
> Since the resolution is now supplied by a devicetree property, the
> resolution-gpios are now optional and we can allow for the case where
> the resolution pins on the AD2S1210 are hard-wired instead of requiring
> them to be connected to gpios.
> 
> Signed-off-by: David Lechner <dlechner@...libre.com>
...

>  
> +static int ad2s1210_setup_properties(struct ad2s1210_state *st)
> +{
> +	struct device *dev = &st->sdev->dev;
> +	u32 val;
> +	int ret;
> +
> +	ret = device_property_read_u32(dev, "assigned-resolution-bits", &val);
Doesn't match patch description of what this is called.

> +	if (ret < 0)
> +		return dev_err_probe(dev, ret,
> +			"failed to read assigned-resolution-bits property\n");
> +
> +	if (val < 10 || val > 16)
> +		return dev_err_probe(dev, -EINVAL,
> +				     "resolution out of range: %u\n", val);
> +
> +	st->resolution = (val - 10) >> 1;
> +
> +	return 0;
> +}
> +