linux-kernel - Re: [PATCH 6/9] iio: imu: st_lsm6dsx: remove event

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Message-ID: <25732d2be08156b4f55e97f5306d1fd080255ae7.camel@baylibre.com>
Date: Mon, 03 Nov 2025 10:34:28 +0100
From: Francesco Lavra <flavra@...libre.com>
To: Andy Shevchenko <andy.shevchenko@...il.com>, Jonathan Cameron
	 <jic23@...nel.org>
Cc: Andy Shevchenko <andriy.shevchenko@...el.com>, Lorenzo Bianconi
	 <lorenzo@...nel.org>, David Lechner <dlechner@...libre.com>, Nuno
	Sá
	 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>, 
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] iio: imu: st_lsm6dsx: remove event_threshold field
 from hw struct

On Sun, 2025-11-02 at 15:45 +0200, Andy Shevchenko wrote:
> On Sun, Nov 2, 2025 at 1:30 PM Jonathan Cameron <jic23@...nel.org> wrote:
> > On Thu, 30 Oct 2025 15:49:37 +0200
> > Andy Shevchenko <andriy.shevchenko@...el.com> wrote:
> > > On Thu, Oct 30, 2025 at 12:10:08PM +0100, Francesco Lavra wrote:
> > > > On Thu, 2025-10-30 at 10:01 +0200, Andy Shevchenko wrote:
> > > > > On Thu, Oct 30, 2025 at 08:27:49AM +0100, Francesco Lavra wrote:
> 
> ...
> 
> > > > > > +       *val = (data & reg->mask) >> __ffs(reg->mask);
> > > > > 
> > > > > Seems like yet another candidate for field_get() macro.
> > > > 
> > > > FIELD_GET() can only be used with compile-time constant masks.
> > > > And apparently this is the case with u8_get_bits() too, because you
> > > > get a
> > > > "bad bitfield mask" compiler error if you try to use u8_get_bits().
> > > 
> > > We are talking about different things.
> > > Here are the pointers to what I'm talking:
> > > 
> > > - git grep -n -w 'field_get'
> > > -
> > > https://lore.kernel.org/linux-gpio/cover.1761588465.git.geert+renesas@glider.be/
> > > 
> > True that it will be a usecase for that, but given plan is to merge
> > that through
> > a different tree in next merge window, it's not available for us yet. 
> > Hence would
> > be a follow up patch next cycle.
> 
> Yes, but we can still define them here. Dunno either with #under or
> under (namespaced) names, but still possible to use now.

OK, I will define an ST_LSM6DSX_FIELD_GET() macro.

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