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

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Date:   Thu, 28 Oct 2021 22:07:21 -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 10/28/21 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.

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?

-Frank