Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752808AbbGONFd (ORCPT ); Wed, 15 Jul 2015 09:05:33 -0400 Received: from mail.kmu-office.ch ([178.209.48.109]:56529 "EHLO mail.kmu-office.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751654AbbGONFb (ORCPT ); Wed, 15 Jul 2015 09:05:31 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Date: Wed, 15 Jul 2015 15:02:35 +0200 From: Stefan Agner To: Shawn Guo Cc: Sanchayan Maity , jic23@kernel.org, mark.rutland@arm.com, devicetree@vger.kernel.org, B38611@freescale.com, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, kernel@pengutronix.de, galak@codeaurora.org, shawn.guo@linaro.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 2/2] ARM: dts: vf-colibri: Add property for minimum sample time In-Reply-To: <20150715015725.GK4119@tiger> References: <20e2cfad3fbb1a45332e9936ea493ddc8bfaf51d.1436880513.git.maitysanchayan@gmail.com> <20150715015725.GK4119@tiger> Message-ID: User-Agent: Roundcube Webmail/1.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1458 Lines: 44 On 2015-07-15 03:57, Shawn Guo wrote: > On Tue, Jul 14, 2015 at 07:23:23PM +0530, Sanchayan Maity wrote: >> Add a device tree property which allows to specify the minimum sample >> time which can be used to calculate the actual ADC cycles required >> depending on the hardware. >> >> Signed-off-by: Sanchayan Maity >> --- >> arch/arm/boot/dts/vf-colibri.dtsi | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/arch/arm/boot/dts/vf-colibri.dtsi b/arch/arm/boot/dts/vf-colibri.dtsi >> index ab10d2e..59f5deb 100644 >> --- a/arch/arm/boot/dts/vf-colibri.dtsi >> +++ b/arch/arm/boot/dts/vf-colibri.dtsi >> @@ -16,10 +16,12 @@ >> }; >> >> &adc0 { >> + min-sample-time = <1000>; >> status = "okay"; >> }; >> >> &adc1 { >> + min-sample-time = <1000>; > > Since this is the default value anyway, we can just save the patch, > right? I thought it would be nice to be explicit here and define this value which we verified internally. On the other hand, we did not derived the minimum value from the DS (using the capacity/resistance of the actual analog source connected) to maximize the sampling frequency, hence I'm also ok with not explicitly defining a value. -- Stefan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/