| Message ID | 1477553651-13428-1-git-send-email-dingtianhong@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Oct 27, 2016 at 03:34:08PM +0800, Ding Tianhong wrote: > 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 <dingtianhong@huawei.com> > --- > Documentation/devicetree/bindings/arm/arch_timer.txt | 8 ++++++++ > 1 file changed, 8 insertions(+) Acked-by: Rob Herring <robh@kernel.org>
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
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 <dingtianhong@huawei.com> --- Documentation/devicetree/bindings/arm/arch_timer.txt | 8 ++++++++ 1 file changed, 8 insertions(+)