linux-kernel - Re: [PATCH v5 05/10] iio: adc: sun20i-gpadc: Use adc-helpers

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Message-ID: <20250308163505.200135cc@jic23-huawei>
Date: Sat, 8 Mar 2025 16:35:05 +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>, Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec
 <jernej.skrabec@...il.com>, Samuel Holland <samuel@...lland.org>, Nuno Sa
 <nuno.sa@...log.com>, David Lechner <dlechner@...libre.com>, Javier
 Carrasco <javier.carrasco.cruz@...il.com>, Olivier Moysan
 <olivier.moysan@...s.st.com>, Guillaume Stols <gstols@...libre.com>,
 Dumitru Ceclan <mitrutzceclan@...il.com>, Trevor Gamblin
 <tgamblin@...libre.com>, Matteo Martelli <matteomartelli3@...il.com>,
 Alisa-Dariana Roman <alisadariana@...il.com>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v5 05/10] iio: adc: sun20i-gpadc: Use adc-helpers

On Mon, 3 Mar 2025 13:33:02 +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"
> -propereties to channel identification numbers, used in the struct

same typo.

> iio_chan_spec. Furthermore, the helper can optionally check the found
> channel IDs are smaller than given maximum. This is useful for callers
> which later use the IDs for example for indexing a channel data array.
> 
> 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
> otherwise. 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 LGTM