linux-kernel - Re: [PATCH v2 4/6] iio: amplifiers: ad8366: add device tree support

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Message-ID: <knzaphyzfuh4fihlftzh3jhjxbjrdjqezqsd7rc33pmtc4anxi@2uhqhizyfsed>
Date: Wed, 28 Jan 2026 10:23:58 +0000
From: Rodrigo Alencar <455.rodrigo.alencar@...il.com>
To: Andy Shevchenko <andriy.shevchenko@...el.com>, 
	Rodrigo Alencar <455.rodrigo.alencar@...il.com>
Cc: rodrigo.alencar@...log.com, linux-kernel@...r.kernel.org, 
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
	Michael Hennerich <Michael.Hennerich@...log.com>, Lars-Peter Clausen <lars@...afoo.de>, 
	Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH v2 4/6] iio: amplifiers: ad8366: add device tree support

On 26/01/28 12:09PM, Andy Shevchenko wrote:
> On Wed, Jan 28, 2026 at 09:55:16AM +0000, Rodrigo Alencar wrote:
> > On 26/01/27 11:21PM, Andy Shevchenko wrote:
> > > On Mon, Jan 26, 2026 at 01:51:05PM +0000, Rodrigo Alencar via B4 Relay wrote:
> 
> ...
> 
> > > > +static size_t ad8366_pack_code(struct ad8366_state *st)
> > > > +{
> > > > +	u8 ch_a = bitrev8(st->ch[0] & 0x3F);
> > > > +	u8 ch_b = bitrev8(st->ch[1] & 0x3F);
> > > 
> > > GENMASK() in both cases? But I don't see why ch_a needs this at all,
> > > isn't the 2 LSBs are not used anyway?
> > 
> > Yes, I can adjust with:
> > 
> > u8 ch_a = bitrev8(st->ch[0]) >> 2;
> > u8 ch_b = bitrev8(st->ch[1]) >> 2;
> > 
> > st->data[0] = ch_b >> 2;
> > st->data[1] = (ch_b << 6) | ch_a;
> > 
> > so no need for masking both.
> 
> This is better, but let's think a bit more. The data we put seems to be
> __be12 (yeah, we don't have the exact type for that) and can be put slightly
> differently.
> 
> So, something like
> 
> 	put_unaligned_be16((ch_b << 6) | ch_a, &st->deta[0]);
> 
> should be better, no? (Note, you would need linux/unaligned.h).

ok, ch_b would have to be u16 and ch_a could be too (for consistency)

-- 
Kind regards,

Rodrigo Alencar