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

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Message-ID: <aQh4m25uVBV8A09F@smile.fi.intel.com>
Date: Mon, 3 Nov 2025 11:40:43 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Francesco Lavra <flavra@...libre.com>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>,
	Jonathan Cameron <jic23@...nel.org>,
	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 Mon, Nov 03, 2025 at 10:34:28AM +0100, Francesco Lavra wrote:
> 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.

With small letters, as this is about run-time helpers (non-constant).

-- 
With Best Regards,
Andy Shevchenko