linux-kernel - Re: [PATCH v4 05/10] iio: adc: sun20i-gpadc: Use adc-helpers

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Message-ID: <20250302034221.3c70c95f@jic23-huawei>
Date: Sun, 2 Mar 2025 03:42:21 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Matti Vaittinen <mazziesaccount@...il.com>
Cc: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>, Lars-Peter Clausen
 <lars@...afoo.de>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Andy Shevchenko
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 Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Sakari Ailus
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 Danilo Krummrich <dakr@...nel.org>, Lad Prabhakar
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 <ramona.nechita@...log.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, linux-iio@...r.kernel.org,
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Subject: Re: [PATCH v4 05/10] iio: adc: sun20i-gpadc: Use adc-helpers

On Mon, 24 Feb 2025 20:33:46 +0200
Matti Vaittinen <mazziesaccount@...il.com> wrote:

> The new devm_iio_adc_device_alloc_chaninfo() -helper is intended to help
> drivers avoid open-coding the for_each_node -loop for getting the
> channel IDs. The helper provides standard way to detect the ADC channel
> nodes (by the node name), and a standard way to convert the "reg",
> "diff-channels", "single-channel" and the "common-mode-channel" to
> channel identification numbers used in the struct iio_chan_spec.
> Furthermore, the helper checks the ID is in range of 0 ... num-channels.
Needs update.

> 
> The original driver treated all found child nodes as channel nodes. The
> new helper requires channel nodes to be named channel[@N]. This should
> help avoid problems with devices which may contain also other but ADC
> child nodes. Quick grep from arch/* with the sun20i-gpadc's compatible
> string didn't reveal any in-tree .dts with channel nodes named
> othervice. Also, same grep shows all the in-tree .dts seem to have
> channel IDs between 0..num of channels.
> 
> Use the new helper.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
> 
Otherwise looks good to me.

Jonathan