From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adel Belhouane Subject: Re: [PATCH 0/1] ARM: dts: exynos: Add timer node for exynos5420 Date: Sun, 3 Apr 2016 22:39:38 +0200 Message-ID: <57017F8A.6030307@free.fr> References: <56FA539F.1000208@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from smtpfb2-g21.free.fr ([212.27.42.10]:59405 "EHLO smtpfb2-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751298AbcDCUjs (ORCPT ); Sun, 3 Apr 2016 16:39:48 -0400 Received: from smtp1-g21.free.fr (smtp1-g21.free.fr [212.27.42.1]) by smtpfb2-g21.free.fr (Postfix) with ESMTP id 4229ED1A774 for ; Sun, 3 Apr 2016 22:39:43 +0200 (CEST) In-Reply-To: <56FA539F.1000208@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org List-Id: linux-samsung-soc@vger.kernel.org To: Krzysztof Kozlowski , Kukjin Kim , linux-samsung-soc@vger.kernel.org Le 29/03/2016 12:06, Krzysztof Kozlowski a =E9crit : > Please look at this thread: > http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/35980= 6.html >=20 > Unfortunately I do not have any more details about this. So I understand MCT and Arch Timer use the same hardware timer and there were issues when the MCT interface reset it at boot and during resume and the Arch Timer consumers didn't expect it. In this thread th= ere were links [1] to a patch to have the MCT not writing the timer anymore= , thus allowing the two interfaces to co-exist. This patch was applied in commit 1d80415db64b. So no problem is to be expected when using both interfaces at the same time. I can see exynos5250 got its Arch Timer definition for KVM: - From the description of commit 2b7da98870bc ARM: dts: Add architected timer nodes for exynos5250 [...] This is required by KVM. So is there something else blocking adding this definition for 542x/580= 0 considering its effect is enabling KVM ? [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-May/257350.h= tml =3D> https://chromium-review.googlesource.com/#/c/200298/ =3D> https://chromium-review.googlesource.com/#/c/201143/ for 3.8 [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-May/258622.h= tml best regards, Adel