From mboxrd@z Thu Jan 1 00:00:00 1970 From: dingtianhong@huawei.com (Ding Tianhong) Date: Thu, 19 Jan 2017 21:35:13 +0800 Subject: [PATCH v9 1/4] arm64: arch_timer: Add device tree binding for hisilicon-161010101 erratum In-Reply-To: <1484832916-7248-1-git-send-email-dingtianhong@huawei.com> References: <1484832916-7248-1-git-send-email-dingtianhong@huawei.com> Message-ID: <1484832916-7248-2-git-send-email-dingtianhong@huawei.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.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. Signed-off-by: Ding Tianhong Acked-by: Rob Herring --- Documentation/devicetree/bindings/arm/arch_timer.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/arch_timer.txt b/Documentation/devicetree/bindings/arm/arch_timer.txt index ad440a2..e926aea 100644 --- a/Documentation/devicetree/bindings/arm/arch_timer.txt +++ b/Documentation/devicetree/bindings/arm/arch_timer.txt @@ -31,6 +31,12 @@ to deliver its interrupts via SPIs. This also affects writes to the tval register, due to the implicit counter read. +- hisilicon,erratum-161010101 : A boolean property. Indicates the + presence of Hisilicon erratum 161010101, which says that reading the + counters is unreliable in some cases, and reads may return a value 32 + beyond the correct value. This also affects writes to the tval + registers, due to the implicit counter read. + ** Optional properties: - arm,cpu-registers-not-fw-configured : Firmware does not initialize -- 1.9.0