From patchwork Sat Nov 26 08:00:43 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ding Tianhong X-Patchwork-Id: 84260 Delivered-To: patch@linaro.org Received: by 10.140.20.101 with SMTP id 92csp395557qgi; Sat, 26 Nov 2016 00:03:52 -0800 (PST) X-Received: by 10.99.111.78 with SMTP id k75mr21730915pgc.114.1480147432887; Sat, 26 Nov 2016 00:03:52 -0800 (PST) Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org. [2001:1868:205::9]) by mx.google.com with ESMTPS id d135si47954261pfd.82.2016.11.26.00.03.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 26 Nov 2016 00:03:52 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) client-ip=2001:1868:205::9; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1cAXwF-0005KE-2b; Sat, 26 Nov 2016 08:02:23 +0000 Received: from szxga02-in.huawei.com ([119.145.14.65]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1cAXw7-0005Ec-5E for linux-arm-kernel@lists.infradead.org; Sat, 26 Nov 2016 08:02:17 +0000 Received: from 172.24.1.136 (EHLO szxeml431-hub.china.huawei.com) ([172.24.1.136]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DRH44413; Sat, 26 Nov 2016 16:01:15 +0800 (CST) Received: from localhost (10.177.23.32) by szxeml431-hub.china.huawei.com (10.82.67.208) with Microsoft SMTP Server id 14.3.235.1; Sat, 26 Nov 2016 16:01:05 +0800 From: Ding Tianhong To: , , , , , , , , , , Subject: [PATCH v4 1/6] arm64: arch_timer: Add device tree binding for hisilicon-161601 erratum Date: Sat, 26 Nov 2016 16:00:43 +0800 Message-ID: <1480147248-12828-2-git-send-email-dingtianhong@huawei.com> X-Mailer: git-send-email 1.8.5.2.msysgit.0 In-Reply-To: <1480147248-12828-1-git-send-email-dingtianhong@huawei.com> References: <1480147248-12828-1-git-send-email-dingtianhong@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.23.32] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161126_000215_771007_82E61DA1 X-CRM114-Status: GOOD ( 11.04 ) X-Spam-Score: -5.6 (-----) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-5.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [119.145.14.65 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -1.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ding Tianhong Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org This erratum describes a bug in logic outside the core, so MIDR can't be used to identify its presence, and reading an SoC-specific revision register from common arch timer code would be awkward. So, describe it in the device tree. v2: Use the new erratum name and update the description. Signed-off-by: Ding Tianhong Acked-by: Rob Herring --- Documentation/devicetree/bindings/arm/arch_timer.txt | 8 ++++++++ 1 file changed, 8 insertions(+) -- 1.9.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/Documentation/devicetree/bindings/arm/arch_timer.txt b/Documentation/devicetree/bindings/arm/arch_timer.txt index ef5fbe9..c27b2c4 100644 --- a/Documentation/devicetree/bindings/arm/arch_timer.txt +++ b/Documentation/devicetree/bindings/arm/arch_timer.txt @@ -31,6 +31,14 @@ to deliver its interrupts via SPIs. This also affects writes to the tval register, due to the implicit counter read. +- hisilicon,erratum-161601 : A boolean property. Indicates the presence of + erratum 161601, which says that reading the counter is unreliable unless + reading twice on the register and the value of the second read is larger + than the first by less than 32. If the verification is unsuccessful, then + discard the value of this read and repeat this procedure until the verification + is successful. This also affects writes to the tval register, due to the + implicit counter read. + ** Optional properties: - arm,cpu-registers-not-fw-configured : Firmware does not initialize