Re: dtc fails to compile <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>

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On Fri, Mar 31, 2017 at 3:25 AM, Waldemar Rymarkiewicz
<waldemar.rymarkiewicz@xxxxxxxxx> wrote:
> On 30 March 2017 at 17:39, Rob Herring <robh@xxxxxxxxxx> wrote:
>> On Thu, Mar 30, 2017 at 4:20 AM, Waldemar Rymarkiewicz
>> <waldemar.rymarkiewicz@xxxxxxxxx> wrote:
>>> Hi,
>>>
>>> I build DT for thermal zone according to
>>>
>>> http://lxr.free-electrons.com/source/Documentation/devicetree/bindings/thermal/thermal.txt#L261
>>>
>>> but dtc (DTC 1.4.1-g53bf130b) fails with syntax error.
>>>
>>>     Error: ../dts/xrx500.dtsi:1060.14-15 syntax error
>>>     FATAL ERROR: Unable to parse input tree
>>>
>>> The problem is with cooling-device property
>>>
>>>       cooling-maps {
>>> 295                         map0 {
>>> 296                                 trip = <&cpu_alert0>;
>>> 297                                 cooling-device =
>>> 298                                     <&cpu0 THERMAL_NO_LIMIT
>>> THERMAL_NO_LIMIT>;
>>> 299                         };
>>> 300                 };
>>>
>>> if I use phandle like <&cpu0> it compiles but  <&cpu0 THERMAL_NO_LIMIT
>>> THERMAL_NO_LIMIT>; fails.
>>>
>>> What could be a reason? any hint ?
>>
>> Did you run it thru the C preprocessor first? Simple #defines are
>> supported in dts files, but you have to use the C preprocessor before
>> passing to dtc. The builds of dts files in the kernel tree do this for
>> you.
>
> Yes,  but preprocessor does not resolve  THERMAL_NO_LIMIT which is
> located in include/linux/thermal.h as far as I can see.

That's by design. dts files should only include include/dt-bindings/*
as they are part of the ABI.

Rob
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