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Mon, 22 Nov 2021 04:11:34 -0500 (EST) Date: Mon, 22 Nov 2021 10:11:32 +0100 From: Maxime Ripard To: Evgeny Boger Cc: Chen-Yu Tsai , linux-sunxi@lists.linux.dev, Lee Jones , Rob Herring , devicetree@vger.kernel.org, Jernej Skrabec , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 1/3] iio: adc: sun4i-gpadc-iio: no temp sensor on R40 Message-ID: <20211122091132.yjudzei3bdqmnxq6@gilmour> References: <20211119191456.510435-1-boger@wirenboard.com> <20211119191456.510435-2-boger@wirenboard.com> MIME-Version: 1.0 In-Reply-To: <20211119191456.510435-2-boger@wirenboard.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211122_011136_530457_54FE3694 X-CRM114-Status: GOOD ( 16.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============6001039071042759554==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============6001039071042759554== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="5m3w6n6uvtg3aopy" Content-Disposition: inline --5m3w6n6uvtg3aopy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Nov 19, 2021 at 10:14:54PM +0300, Evgeny Boger wrote: > R40 SoC has touchscreen controller also serving as general-purpose ADC. > The hardware is very similar to A31, except that R40 has separate > calibrated thermal sensor IP (handled by sun8i_thermal). >=20 > Despite the temperature sensor in the RTP is never mentioned in > the R40 family user manuals, it appears to be working. However, > it's not very useful as it lacks calibration data and there is another > fully functioning temperature sensor anyway. >=20 > This patch disables the temperature sensor in RTP/GPADC IP on R40. >=20 > The reason for disabling the temperature sensor is that the IP > needs to be switched back and forth between RTP and GPADC modes for > temperature measurements. Not only this introduces delays, but it also > disturbs external circuitry by injecting current into ADC inputs. >=20 > Signed-off-by: Evgeny Boger Acked-by: Maxime Ripard Maxime --5m3w6n6uvtg3aopy Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCYZtexAAKCRDj7w1vZxhR xca1AP9islsecrS7jYHo44n4PHe8SZC1VKVznrNJC8o8XLJl2AD+OSC7BWH8+zyj rchrEj5ttxbcr1NqwCygE4DvvYLqpAg= =yh2K -----END PGP SIGNATURE----- --5m3w6n6uvtg3aopy-- --===============6001039071042759554== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============6001039071042759554==--