linux-kernel - [PATCH 4.9 39/67] clocksource/drivers/arm_arch_timer: Add dt binding for hisilicon-161010101 erratum

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Message-Id: <20171106091306.958418426@linuxfoundation.org>
Date:   Mon,  6 Nov 2017 10:44:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ding Tianhong <dingtianhong@...wei.com>,
        Rob Herring <robh@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 39/67] clocksource/drivers/arm_arch_timer: Add dt binding for hisilicon-161010101 erratum

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ding Tianhong <dingtianhong@...wei.com>


[ Upstream commit 729e55225b1f6225ee7a2a358d5141a3264627c4 ]

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 <dingtianhong@...wei.com>
Acked-by: Rob Herring <robh@...nel.org>
Signed-off-by: Mark Rutland <mark.rutland@....com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 Documentation/devicetree/bindings/arm/arch_timer.txt |    6 ++++++
 1 file changed, 6 insertions(+)

--- 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