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Mon, 12 Jan 2026 05:26:15 -0800 (PST) Message-ID: Subject: Re: [PATCH 2/2] iio: accel: adxl380: Add support for 1 kHz sampling frequency From: Nuno =?ISO-8859-1?Q?S=E1?= To: Francesco Lavra , Ramona Gradinariu , Antoniu Miclaus , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , Nuno =?ISO-8859-1?Q?S=E1?= , Andy Shevchenko , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 12 Jan 2026 13:26:57 +0000 In-Reply-To: <371503c267d9ded0195da126b58bc8339cb864e8.camel@baylibre.com> References: <20260107123518.4017292-1-flavra@baylibre.com> <20260107123518.4017292-3-flavra@baylibre.com> <52e5cea72b99fc23c922cf74d7dce3403f43c9cd.camel@gmail.com> <9a5db937dc7072d95d6757cdf2eb8d6fde4abbd0.camel@baylibre.com> <5cd68e397bb45f606f59038290e4f3ac09d241da.camel@gmail.com> <371503c267d9ded0195da126b58bc8339cb864e8.camel@baylibre.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2026-01-08 at 15:07 +0100, Francesco Lavra wrote: > On Thu, 2026-01-08 at 13:45 +0000, Nuno S=C3=A1 wrote: > > On Wed, 2026-01-07 at 16:39 +0100, Francesco Lavra wrote: > > > On Wed, 2026-01-07 at 13:56 +0000, Nuno S=C3=A1 wrote: > > >=20 > > > > 3. Other thing that comes to mind is if it makes sense to allow > > > > controlling odr if > > > > Activity/Inactivity detection is enabled? > > >=20 > > > Disallowing odr control when activity detection is enabled could be a= n > > > option, but what error code should be returned if the user tries to s= et > > > the > > > sampling frequency value when not allowed? -EBUSY? > >=20 > > I think it makes sense given the constrains on activity events. EBUSY > > would be my choice as well. > > Out of curiosity, do you know how the chip behaves if we change the odr > > with activity enabled? Is it > > just ignored? >=20 > The chip supports activity detection only when in low-power mode; changin= g > the odr to a value that requires exiting from low-power mode would mean > effectively disabling activity detection. The driver prevents this by > forcing low-power mode whenever detection is enabled, which means that an= y > odr changes by userspace do not take effect as long as detection is > enabled. Thx for the explanation! - Nuno S=C3=A1