linux-kernel - Re: [PATCH V5 5/5] of: unittest: Statically apply overlays using fdtoverlay

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Date:   Thu, 21 Jan 2021 11:51:45 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bill Mills <bill.mills@...aro.org>, anmar.oueja@...aro.org
Subject: Re: [PATCH V5 5/5] of: unittest: Statically apply overlays using
 fdtoverlay

On Wed, Jan 20, 2021 at 12:36:47PM +0530, Viresh Kumar wrote:
> Now that fdtoverlay is part of the kernel build, start using it to test
> the unitest overlays we have by applying them statically.
> 
> Some unittest overlays deliberately contain errors that unittest checks
> for. These overlays will cause fdtoverlay to fail, and are thus not
> included in the static_test.dtb.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/of/unittest-data/Makefile | 50 +++++++++++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
> 
> diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
> index 009f4045c8e4..ece7dfd5cafa 100644
> --- a/drivers/of/unittest-data/Makefile
> +++ b/drivers/of/unittest-data/Makefile
> @@ -38,3 +38,53 @@ DTC_FLAGS_testcases += -@
>  
>  # suppress warnings about intentional errors
>  DTC_FLAGS_testcases += -Wno-interrupts_property
> +
> +# Apply overlays statically with fdtoverlay.  This is a build time test that
> +# the overlays can be applied successfully by fdtoverlay.  This does not
> +# guarantee that the overlays can be applied successfully at run time by
> +# unittest, but it provides a bit of build time test coverage for those
> +# who do not execute unittest.
> +#
> +# The overlays are applied on top of testcases.dtb to create static_test.dtb
> +# If fdtoverlay detects an error than the kernel build will fail.
> +# static_test.dtb is not consumed by unittest.
> +#
> +# Some unittest overlays deliberately contain errors that unittest checks for.
> +# These overlays will cause fdtoverlay to fail, and are thus not included
> +# in the static test:
> +#			overlay.dtb \
> +#			overlay_bad_add_dup_node.dtb \
> +#			overlay_bad_add_dup_prop.dtb \
> +#			overlay_bad_phandle.dtb \
> +#			overlay_bad_symbol.dtb \
> +#			overlay_base.dtb \
> +
> +apply_static_overlay := overlay_0.dtb \
> +			overlay_1.dtb \
> +			overlay_2.dtb \
> +			overlay_3.dtb \
> +			overlay_4.dtb \
> +			overlay_5.dtb \
> +			overlay_6.dtb \
> +			overlay_7.dtb \
> +			overlay_8.dtb \
> +			overlay_9.dtb \
> +			overlay_10.dtb \
> +			overlay_11.dtb \
> +			overlay_12.dtb \
> +			overlay_13.dtb \
> +			overlay_15.dtb \
> +			overlay_gpio_01.dtb \
> +			overlay_gpio_02a.dtb \
> +			overlay_gpio_02b.dtb \
> +			overlay_gpio_03.dtb \
> +			overlay_gpio_04a.dtb \
> +			overlay_gpio_04b.dtb
> +
> +quiet_cmd_fdtoverlay = FDTOVERLAY $@
> +      cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $^
> +
> +$(obj)/static_test.dtb: $(obj)/testcases.dtb $(addprefix $(obj)/,$(apply_static_overlay))
> +	$(call if_changed,fdtoverlay)
> +
> +always-$(CONFIG_OF_OVERLAY) += static_test.dtb

The fact that testcases.dts includes /plugin/ still seems completely
wrong, if it's being used as the base tree.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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