linux-kernel - Re: [PATCH 1/1] of: unittest: fix dts for interrupt-map provider build warning

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Date:   Fri, 29 Oct 2021 12:33:55 -0500
From:   Frank Rowand <frowand.list@...il.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] of: unittest: fix dts for interrupt-map provider
 build warning

On 10/29/21 8:16 AM, Rob Herring wrote:
> On Thu, Oct 28, 2021 at 10:07 PM Frank Rowand <frowand.list@...il.com> wrote:
>>
>> On 10/28/21 9:07 PM, Rob Herring wrote:
>>> On Thu, Oct 28, 2021 at 7:58 PM <frowand.list@...il.com> wrote:
>>>>
>>>> From: Frank Rowand <frank.rowand@...y.com>
>>>>
>>>> Fix kernel build warning:
>>>> drivers/of/unittest-data/tests-interrupts.dtsi:32.26-35.6: Warning (interrupt_map): /testcase-data/interrupts/intmap1: Missing '#address-cells' in interrupt-map provider
>>>>
>>>> A recently implemented dtc compiler warning reported the dts problem.
>>>>
>>>> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
>>>> ---
>>>>  drivers/of/unittest-data/tests-interrupts.dtsi | 1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/of/unittest-data/tests-interrupts.dtsi b/drivers/of/unittest-data/tests-interrupts.dtsi
>>>> index 9b60a549f502..8c2b91b998aa 100644
>>>> --- a/drivers/of/unittest-data/tests-interrupts.dtsi
>>>> +++ b/drivers/of/unittest-data/tests-interrupts.dtsi
>>>> @@ -31,6 +31,7 @@ test_intmap0: intmap0 {
>>>>
>>>>                         test_intmap1: intmap1 {
>>>>                                 #interrupt-cells = <2>;
>>>> +                               #address-cells = <1>;
>>>
>>> Notice that we have 2 nodes with interrupt-map here. One has
>>> '#address-cells' and one doesn't. Why? Because we need to test that
>>> the code can handle both cases.>
>>> The dtc warnings are more what should 'new' users do. I don't know
>>> what DTs don't have #address-cells, but my guess is ancient ones.
>>>
>>> Rob
>>>
>>
>> I had hoped to build all of the .dts files in the Linux tree, with the
>> new dtc, but did not get to that today.  That should flush out any
>> cases that would result in build fail from the new approach of treating
>> all warnings as errors.  I may get to that tomorrow.
> 
> They are still just warnings. You mean the requirement to be warning
> free? That's not new for dts files.
> 
>> If there any any existing .dts files that will trigger the interrupt
>> map warning, will we require that they be fixed so that the build will
>> not fail?
> 
> I already submitted patches for them.

OK, I'll drop this patchk, and instead create a patch that documents
why the unittest .dts is missing #address-cells.

-Frank

> 
> Rob
>