From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 841ACC43334 for ; Thu, 9 Jun 2022 14:55:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=xZ4eEH+/iBMSZ3ZCLNYEBzpZnVAv43gSB3iNjPUijnI=; b=V4rcE3nSqsXt7m Gnm7DB8xAfSSir2HJxz5fHPyBMNknKSfqH5t/PHjgWNhVOE6Kl72OdWexqgl7yF3Och71IKlWvABG 4Jtno6zeRO34HAX8NY5nhc4I03iYN+jwS789qE/ns3St3C3InZ9QzEcjSF8xbUkFfvSrAALrvv9cW 19jCJUZJwJzmT/l8afVW3S0NFnv7gk4J3ew4tk93LXNiohIDlieQlc9XDiB69RQZa+dFPPRydlMSS UKtNfX/h4XmsTNkinsOZYYm1lP37hOdGvRuf5yVhGZ+qQFNOwMEHgIoWFcf+U0pRWkynyNh/hmOWa bUDvxOcpQW9NMZdRpSww==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nzJXs-002aRN-M9; Thu, 09 Jun 2022 14:54:00 +0000 Received: from relay4-d.mail.gandi.net ([2001:4b98:dc4:8::224]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nzJXn-002aOy-3V for linux-arm-kernel@lists.infradead.org; Thu, 09 Jun 2022 14:53:56 +0000 Received: (Authenticated sender: alexandre.belloni@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 1F844E000B; Thu, 9 Jun 2022 14:53:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1654786429; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=f976Phy9dbyp8PfTdJv/r4/TWKmZetB6K2N29VZ68bs=; b=oMlNSPZmrZnLNnhi2KkImi3VKLojeIwiLpBjpjbDiyOQVtdONpj0Q5u9R/z5x7F728VbNN bwU5IiAqaPTTUJ0l3WnliDh6Q5OcXZ1ABl+3ZAuvnA2gOJBtvvRpmmlD5QVmLhP9oOPHmw kE/E1kC4odTMFH1BEnozW2b3pdFcqyE9/C4QaSZC02auE6yyOF+XpIqapyZoE4YgkHBsEf 0SQOC2Bj3R22/Qgkp6MCXP94TUzzqzHzQqQRy8pOK/RHjowU6WuKvLJI309cRyaLvGnpb3 DXEiBOoH+9tNbmY7/uuJlhdPoeH8Y69+vbrOTJXCeh2PTwkhLs2Mx1XESKUPdw== Date: Thu, 9 Jun 2022 16:53:46 +0200 From: Alexandre Belloni To: Peter Korsgaard Cc: Srinivas Neeli , a.zummo@towertech.it, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, michal.simek@xilinx.com, sgoud@xilinx.com, shubhraj@xilinx.com, srinivas.neeli@amd.com, neelisrinivas18@gmail.com, devicetree@vger.kernel.org, linux-rtc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, git@xilinx.com Subject: Re: [PATCH V6 2/2] rtc: zynqmp: Add calibration set and get support Message-ID: References: <20220609140833.1784738-1-srinivas.neeli@xilinx.com> <20220609140833.1784738-2-srinivas.neeli@xilinx.com> <87r13x28o4.fsf@dell.be.48ers.dk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87r13x28o4.fsf@dell.be.48ers.dk> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220609_075355_329043_EA4D8957 X-CRM114-Status: GOOD ( 11.84 ) 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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 09/06/2022 16:50:03+0200, Peter Korsgaard wrote: > >>>>> "Srinivas" == Srinivas Neeli writes: > > > Zynqmp RTC controller has a calibration feature to compensate > > time deviation due to input clock inaccuracy. > > Set and get calibration API's are used for setting and getting > > calibration value from the controller calibration register. > > As per RTC spec default calibration value is 0x7FFF. > > Where do you see that? ug1085 rev2.2 still lists: > > Programming Sequences > init rtc > 1. Write the value 0019_8231h into the calibration register, CALIB_WRITE. > This is a very weird value. Last time I had a look, I couldn't find an explanation for it. -- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel