[PATCH 1/3] arm64: arch_timer: Add device tree binding for hisilicon-161x01 erratum
Marc Zyngier
marc.zyngier at arm.com
Mon Oct 24 01:36:20 PDT 2016
On 23/10/16 04:21, 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.
>
> Signed-off-by: Ding Tianhong <dingtianhong at huawei.com>
> ---
> 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 ef5fbe9..26bc837 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-161x01 : A boolean property. Indicates the presence of
> + QorIQ erratum 161201, which says that reading the counter is
Other than the copy/paste of the FSL erratum, please document the actual
erratum number. Is that 161x01 or 161201?
> + unreliable unless the small range of value is returned by back-to-back reads.
That's a detail that doesn't belong in the DT, but that would be much
better next to the code doing the actual handling.
> + 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
>
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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