linux-kernel - Re: [PATCH 1/1] of: unittest: document intentional interrupt-map provider build warning

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Message-ID: <YX/sTGG/WUqhDzr4@robh.at.kernel.org>
Date:   Mon, 1 Nov 2021 08:31:56 -0500
From:   Rob Herring <robh@...nel.org>
To:     frowand.list@...il.com
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] of: unittest: document intentional interrupt-map
 provider build warning

On Fri, Oct 29, 2021 at 08:10:39PM -0500, frowand.list@...il.com wrote:
> From: Frank Rowand <frank.rowand@...y.com>
> 
> A recently implemented dtc compiler warning reports a dts problem
> via a 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
> 
> The warning will be addressed by a separate patch by suppressing the
> warning for .dts files that include this .dtsi.  This patch documents
> why the warning is due to a deliberately incorrect .dtsi file so that
> no one will fix the .dtsi file to prevent the build warning.
> 
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> ---
>  .../of/unittest-data/tests-interrupts.dtsi    | 19 +++++++++++++++++++
>  drivers/of/unittest.c                         |  6 ++++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/of/unittest-data/tests-interrupts.dtsi b/drivers/of/unittest-data/tests-interrupts.dtsi
> index 9b60a549f502..8c8d267d4d3c 100644
> --- a/drivers/of/unittest-data/tests-interrupts.dtsi
> +++ b/drivers/of/unittest-data/tests-interrupts.dtsi
> @@ -31,6 +31,21 @@ test_intmap0: intmap0 {
>  
>  			test_intmap1: intmap1 {
>  				#interrupt-cells = <2>;
> +				/*
> +				 * #address-cells is required
> +				 *
> +				 * The property is not provided in this node to
> +				 * test that the code will properly handle
> +				 * this case for legacy .dts files.
> +				 *
> +				 * Not having #address-cells will result in a
> +				 * warning from dtc starting with
> +				 * version v1.6.1-19-g0a3a9d3449c8
> +				 * The warning is suppressed by adding
> +				 * -Wno-interrupts_property to the Makefile

s/interrupts_property/interrupt_map/

I'll fix when applying.

> +				 * for all .dts files this include this .dtsi
> +				#address-cells = <1>;
> +				 */
>  				interrupt-map = <0x5000 1 2 &test_intc0 15>;
>  			};
>  
> @@ -46,6 +61,10 @@ interrupts1 {
>  
>  			interrupts-extended0 {
>  				reg = <0x5000 0x100>;
> +				/*
> +				 * Do not remove &test_intmap1 from this
> +				 * property - see comment in node intmap1
> +				 */
>  				interrupts-extended = <&test_intc0 1>,
>  						      <&test_intc1 2 3 4>,
>  						      <&test_intc2 5 6>,
> diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
> index 8c056972a6dd..04bfef8f67c3 100644
> --- a/drivers/of/unittest.c
> +++ b/drivers/of/unittest.c
> @@ -1129,6 +1129,12 @@ static void __init of_unittest_parse_interrupts_extended(void)
>  			passed &= (args.args[1] == 14);
>  			break;
>  		case 6:
> +			/*
> +			 * Tests child node that is missing property
> +			 * #address-cells.  See the comments in
> +			 * drivers/of/unittest-data/tests-interrupts.dtsi
> +			 * nodes intmap1 and interrupts-extended0
> +			 */
>  			passed &= !rc;
>  			passed &= (args.args_count == 1);
>  			passed &= (args.args[0] == 15);
> -- 
> Frank Rowand <frank.rowand@...y.com>
> 
>