From: Jonathan Cameron <Jonathan.Cameron@Huawei.com> To: Maxime Ripard <maxime@cerno.tech> Cc: Evgeny Boger <boger@wirenboard.com>, Chen-Yu Tsai <wens@csie.org>, <linux-sunxi@lists.linux.dev>, Lee Jones <lee.jones@linaro.org>, Rob Herring <robh+dt@kernel.org>, <devicetree@vger.kernel.org>, Jernej Skrabec <jernej.skrabec@gmail.com>, <linux-arm-kernel@lists.infradead.org>, <linux-iio@vger.kernel.org> Subject: Re: [PATCH 1/3] iio: adc: sun4i-gpadc-iio: no temp sensor on R40 Date: Mon, 22 Nov 2021 12:41:15 +0000 [thread overview] Message-ID: <20211122124115.00005186@Huawei.com> (raw) In-Reply-To: <20211122091132.yjudzei3bdqmnxq6@gilmour> On Mon, 22 Nov 2021 10:11:32 +0100 Maxime Ripard <maxime@cerno.tech> wrote: > 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). > > > > 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. > > > > This patch disables the temperature sensor in RTP/GPADC IP on R40. > > > > 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. > > > > Signed-off-by: Evgeny Boger <boger@wirenboard.com> > > Acked-by: Maxime Ripard <maxime@cerno.tech> +Cc linux-iio@vger.kernel.org I'm fine with this and assuming Lee is happy to pick it up + send me an immutable branch in case anything crosses with it this cycle.. Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Thanks, Jonathan > > Maxime >
WARNING: multiple messages have this Message-ID (diff)
From: Jonathan Cameron <Jonathan.Cameron@Huawei.com> To: Maxime Ripard <maxime@cerno.tech> Cc: Evgeny Boger <boger@wirenboard.com>, Chen-Yu Tsai <wens@csie.org>, <linux-sunxi@lists.linux.dev>, Lee Jones <lee.jones@linaro.org>, Rob Herring <robh+dt@kernel.org>, <devicetree@vger.kernel.org>, Jernej Skrabec <jernej.skrabec@gmail.com>, <linux-arm-kernel@lists.infradead.org>, <linux-iio@vger.kernel.org> Subject: Re: [PATCH 1/3] iio: adc: sun4i-gpadc-iio: no temp sensor on R40 Date: Mon, 22 Nov 2021 12:41:15 +0000 [thread overview] Message-ID: <20211122124115.00005186@Huawei.com> (raw) In-Reply-To: <20211122091132.yjudzei3bdqmnxq6@gilmour> On Mon, 22 Nov 2021 10:11:32 +0100 Maxime Ripard <maxime@cerno.tech> wrote: > 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). > > > > 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. > > > > This patch disables the temperature sensor in RTP/GPADC IP on R40. > > > > 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. > > > > Signed-off-by: Evgeny Boger <boger@wirenboard.com> > > Acked-by: Maxime Ripard <maxime@cerno.tech> +Cc linux-iio@vger.kernel.org I'm fine with this and assuming Lee is happy to pick it up + send me an immutable branch in case anything crosses with it this cycle.. Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Thanks, Jonathan > > Maxime > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-11-22 13:00 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-19 19:14 [PATCH 0/3] Enable RTP (GPADC) controller on Allwinner R40 Evgeny Boger 2021-11-19 19:14 ` Evgeny Boger 2021-11-19 19:14 ` [PATCH 1/3] iio: adc: sun4i-gpadc-iio: no temp sensor on R40 Evgeny Boger 2021-11-19 19:14 ` Evgeny Boger 2021-11-22 9:11 ` Maxime Ripard 2021-11-22 9:11 ` Maxime Ripard 2021-11-22 12:41 ` Jonathan Cameron [this message] 2021-11-22 12:41 ` Jonathan Cameron 2022-01-11 13:13 ` Evgeny Boger 2022-01-11 13:13 ` Evgeny Boger 2022-01-15 15:41 ` Jonathan Cameron 2022-01-15 15:41 ` Jonathan Cameron 2022-01-17 9:00 ` Lee Jones 2022-01-17 9:00 ` Lee Jones 2021-11-19 19:14 ` [PATCH 2/3] dt-bindings: iio: adc: new compatible for Allwinner R40 RTP controller Evgeny Boger 2021-11-19 19:14 ` Evgeny Boger 2021-11-22 9:10 ` Maxime Ripard 2021-11-22 9:10 ` Maxime Ripard 2021-11-30 1:46 ` Rob Herring 2021-11-30 1:46 ` Rob Herring 2021-11-19 19:14 ` [PATCH 3/3] ARM: dts: sun8i: r40: add rtp node Evgeny Boger 2021-11-19 19:14 ` Evgeny Boger
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