From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <51D2DE5B.9060309@free-electrons.com> Date: Tue, 02 Jul 2013 16:06:19 +0200 From: Alexandre Belloni MIME-Version: 1.0 To: Fabio Estevam CC: Shawn Guo , Jonathan Cameron , brian@crystalfontz.com, linux-doc@vger.kernel.org, linux-iio@vger.kernel.org, devicetree-discuss@lists.ozlabs.org, jimwall@q.com, Rob Herring , linux-kernel@vger.kernel.org, Grant Likely , Rob Landley , Maxime Ripard , linux-arm-kernel@lists.infradead.org, Lucas Stach , Marek Vasut Subject: Re: [PATCHv3 2/3] ARM: mxs: cfa10049: Switch bus i2c1 to bitbanging References: <1372094699-3832-1-git-send-email-alexandre.belloni@free-electrons.com> <1372094699-3832-3-git-send-email-alexandre.belloni@free-electrons.com> <51D2BB05.9040201@free-electrons.com> <51D2BEA1.6010206@free-electrons.com> In-Reply-To: <51D2BEA1.6010206@free-electrons.com> Content-Type: text/plain; charset=UTF-8 List-ID: On 02/07/2013 13:50, Alexandre Belloni wrote: > On 02/07/2013 13:45, Fabio Estevam wrote: > >> Shouldn't this be >> >> i2c@1 { >> reg = <1>; ? >> > > No, we have 4 devices on that mux and 2 pins to select the muxing. > OK, got it working. So, the results: bitbanging: # time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw 2637 real 0m 0.09s user 0m 0.01s sys 0m 0.01s i2c-mxs PIO mode: # time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw [ 35.007650] [sched_delayed] sched: RT throttling activated 2627 real 0m 7.14s user 0m 0.02s sys 0m 0.01s i2c-mxs PIO mode without LRADC: # time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw [ 18.007432] [sched_delayed] sched: RT throttling activated 2629 real 0m 7.09s user 0m 0.00s sys 0m 0.03s i2c-mxs DMA mode: # time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw 2631 real 0m 0.12s user 0m 0.01s sys 0m 0.01s It seems fine for me. -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com From mboxrd@z Thu Jan 1 00:00:00 1970 From: alexandre.belloni@free-electrons.com (Alexandre Belloni) Date: Tue, 02 Jul 2013 16:06:19 +0200 Subject: [PATCHv3 2/3] ARM: mxs: cfa10049: Switch bus i2c1 to bitbanging In-Reply-To: <51D2BEA1.6010206@free-electrons.com> References: <1372094699-3832-1-git-send-email-alexandre.belloni@free-electrons.com> <1372094699-3832-3-git-send-email-alexandre.belloni@free-electrons.com> <51D2BB05.9040201@free-electrons.com> <51D2BEA1.6010206@free-electrons.com> Message-ID: <51D2DE5B.9060309@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 02/07/2013 13:50, Alexandre Belloni wrote: > On 02/07/2013 13:45, Fabio Estevam wrote: > >> Shouldn't this be >> >> i2c at 1 { >> reg = <1>; ? >> > > No, we have 4 devices on that mux and 2 pins to select the muxing. > OK, got it working. So, the results: bitbanging: # time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw 2637 real 0m 0.09s user 0m 0.01s sys 0m 0.01s i2c-mxs PIO mode: # time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw [ 35.007650] [sched_delayed] sched: RT throttling activated 2627 real 0m 7.14s user 0m 0.02s sys 0m 0.01s i2c-mxs PIO mode without LRADC: # time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw [ 18.007432] [sched_delayed] sched: RT throttling activated 2629 real 0m 7.09s user 0m 0.00s sys 0m 0.03s i2c-mxs DMA mode: # time cat /sys/bus/iio/devices/iio\:device1/in_voltage0_raw 2631 real 0m 0.12s user 0m 0.01s sys 0m 0.01s It seems fine for me. -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com