From: Scott Wood <oss-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
To: Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org>
Cc: Shawn Guo <shawnguo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
stuart.yoder-3arQi8VN3Tc@public.gmane.org,
mike.caraman-3arQi8VN3Tc@public.gmane.org,
Ding Tianhong
<dingtianhong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
Scott Wood <oss-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
Subject: [PATCH v5 1/5] arm64: arch_timer: Add device tree binding for A-008585 erratum
Date: Fri, 9 Sep 2016 20:03:29 -0500 [thread overview]
Message-ID: <1473469413-11019-1-git-send-email-oss@buserror.net> (raw)
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: Scott Wood <oss-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
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 e774128..ef5fbe9 100644
--- a/Documentation/devicetree/bindings/arm/arch_timer.txt
+++ b/Documentation/devicetree/bindings/arm/arch_timer.txt
@@ -25,6 +25,12 @@ to deliver its interrupts via SPIs.
- always-on : a boolean property. If present, the timer is powered through an
always-on power domain, therefore it never loses context.
+- fsl,erratum-a008585 : A boolean property. Indicates the presence of
+ QorIQ erratum A-008585, which says that reading the counter is
+ unreliable unless the same value is returned by back-to-back reads.
+ 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
--
2.7.4
--
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WARNING: multiple messages have this Message-ID (diff)
From: oss@buserror.net (Scott Wood)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 1/5] arm64: arch_timer: Add device tree binding for A-008585 erratum
Date: Fri, 9 Sep 2016 20:03:29 -0500 [thread overview]
Message-ID: <1473469413-11019-1-git-send-email-oss@buserror.net> (raw)
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: Scott Wood <oss@buserror.net>
Acked-by: Rob Herring <robh@kernel.org>
---
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 e774128..ef5fbe9 100644
--- a/Documentation/devicetree/bindings/arm/arch_timer.txt
+++ b/Documentation/devicetree/bindings/arm/arch_timer.txt
@@ -25,6 +25,12 @@ to deliver its interrupts via SPIs.
- always-on : a boolean property. If present, the timer is powered through an
always-on power domain, therefore it never loses context.
+- fsl,erratum-a008585 : A boolean property. Indicates the presence of
+ QorIQ erratum A-008585, which says that reading the counter is
+ unreliable unless the same value is returned by back-to-back reads.
+ 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
--
2.7.4
next reply other threads:[~2016-09-10 1:03 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-10 1:03 Scott Wood [this message]
2016-09-10 1:03 ` [PATCH v5 1/5] arm64: arch_timer: Add device tree binding for A-008585 erratum Scott Wood
[not found] ` <1473469413-11019-1-git-send-email-oss-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
2016-09-10 1:03 ` [PATCH v5 2/5] arm64: dts: Add timer erratum property for LS2080A and LS1043A Scott Wood
2016-09-10 1:03 ` Scott Wood
2016-09-10 1:03 ` [PATCH v5 3/5] arm64: arch_timer: Work around QorIQ Erratum A-008585 Scott Wood
2016-09-10 1:03 ` Scott Wood
[not found] ` <1473469413-11019-3-git-send-email-oss-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
2016-09-12 11:36 ` Mark Rutland
2016-09-12 11:36 ` Mark Rutland
2016-09-12 11:44 ` Will Deacon
2016-09-12 11:44 ` Will Deacon
[not found] ` <20160912114406.GG23211-5wv7dgnIgG8@public.gmane.org>
2016-09-12 12:30 ` Mark Rutland
2016-09-12 12:30 ` Mark Rutland
2016-09-12 12:59 ` Mark Rutland
2016-09-12 12:59 ` Mark Rutland
2016-09-12 13:07 ` Marc Zyngier
2016-09-12 13:07 ` Marc Zyngier
[not found] ` <57D6A88D.7000002-5wv7dgnIgG8@public.gmane.org>
2016-09-19 4:31 ` Scott Wood
2016-09-19 4:31 ` Scott Wood
[not found] ` <1474259505.15220.8.camel-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
2016-09-19 16:55 ` Mark Rutland
2016-09-19 16:55 ` Mark Rutland
2016-09-19 4:28 ` Scott Wood
2016-09-19 4:28 ` Scott Wood
[not found] ` <1474259324.15220.5.camel-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
2016-09-19 7:44 ` Arnd Bergmann
2016-09-19 7:44 ` Arnd Bergmann
2016-09-20 12:52 ` Shawn Guo
2016-09-20 12:52 ` Shawn Guo
2016-09-19 4:41 ` Scott Wood
2016-09-19 4:41 ` Scott Wood
[not found] ` <1474260085.15220.17.camel-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
2016-09-19 16:52 ` Mark Rutland
2016-09-19 16:52 ` Mark Rutland
2016-09-19 17:01 ` Scott Wood
2016-09-19 17:01 ` Scott Wood
[not found] ` <1474304489.4283.6.camel-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
2016-09-19 17:07 ` Mark Rutland
2016-09-19 17:07 ` Mark Rutland
2016-09-19 19:16 ` Scott Wood
2016-09-19 19:16 ` Scott Wood
[not found] ` <1474312560.4283.10.camel-fOR+EgIDQEHk1uMJSBkQmQ@public.gmane.org>
2016-09-20 9:35 ` Mark Rutland
2016-09-20 9:35 ` Mark Rutland
2016-09-22 8:34 ` Scott Wood
2016-09-22 8:34 ` Scott Wood
2016-09-10 1:03 ` [PATCH v5 4/5] arm/arm64: arch_timer: Use archdata to indicate vdso suitability Scott Wood
2016-09-10 1:03 ` Scott Wood
2016-09-10 1:03 ` [PATCH v5 5/5] arm64: arch_timer: Add command line parameter for A-008585 Scott Wood
2016-09-10 1:03 ` Scott Wood
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