Messages in this thread | | | Subject | Re: [PATCH 03/11] devicetree: bindings: Document qcom,kpss-acc | From | Kumar Gala <> | Date | Tue, 5 Nov 2013 11:51:07 -0600 |
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On Nov 5, 2013, at 11:44 AM, Stephen Boyd wrote:
> On 11/05/13 09:13, Kumar Gala wrote: >> On Nov 1, 2013, at 5:08 PM, Stephen Boyd wrote: >> >>> diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt >>> new file mode 100644 >>> index 0000000..ed4a9c8 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt >>> @@ -0,0 +1,21 @@ >>> +* Krait Processor Sub-system (KPSS) Application Clock Controller (ACC) >>> + >>> +The KPSS ACC provides clock, power domain, and reset control to a Krait CPU. >>> +There is one ACC register region per CPU within the KPSS remaped region as >>> +well as an alias register region that remaps accesses to the ACC associated >>> +with the CPU accessing the region. >>> + >>> +Required Properties: >>> + >>> +- compatible : Shall contain "qcom,kpss-acc-v1" or "qcom,kpss-acc-v2". >>> +- reg: Specifies the base address and size of the banked register region. >>> +- cpu-offset : per-cpu offset used when the device is accessed without the >>> + CPU remapping facilities. >>> + The offset is cpu-offset + (0x10000 * cpu-nr). >>> + >>> +Example: >>> + >>> + clock-controller@2008000 { >>> + compatible = "qcom,kpss-acc-v2"; >>> + reg = <0x02008000 0x1000>; >>> + }; >>> -- >> I don't get the cpu-offset business, shouldn't this just be: >> reg = <0x02008000 0x1000>, <0x02018000 0x1000>, <0x02028000 0x1000>, <0x02038000 0x1000>; >> > > (Sorry I forgot to add the cpu-offset to the example.) > > Your reg property is one way to do it. I was following the example of > the GIC binding which just specifies the alias region of the GIC's CPU > registers and then has a cpu-offset property to describe how to reach a > specific CPU's region.
Even in the gic's case I think we should have the reg property cover the memory map.
- k
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