On Fri, Oct 29, 2021 at 08:10:39PM -0500, frowand.list@xxxxxxxxx wrote:
> From: Frank Rowand <frank.rowand@xxxxxxxx>
>
> 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@xxxxxxxx>
> ---
> .../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@xxxxxxxx>
>
>
