From: Frank Rowand <frank.rowand@xxxxxxxx> Geert reports that gpio hog nodes are not properly processed when the gpio hog node is added via an overlay reply and provides an RFC patch to fix the problem [1]. Add a unittest that shows the problem. Unittest will report "1 failed" test before applying Geert's RFC patch and "0 failed" after applying Geert's RFC patch. I did not have a development system for which it would be easy to experiment with applying an overlay containing a gpio hog, so I instead created this unittest that uses a fake gpio node. This series is a work in progress and I have not properly reviewed it yet myself. The work behind the series has resulted in my following several paths and distractions, resulting in more delay than I would desire in continuing to review Geert's RFC patches. I am thus releasing these patches as an RFC so that my work behind the review is visible and available for Geert and other reviewers of his patch. The annotations added in patch 2/2 add a small amount of verbosity to the console output. I have created a proof of concept tool to explore (1) how test harnesses could use the annotations and (2) how to make the resulting console output easier to read and understand as a human being. The tool 'of_unittest_expect' is available at https://github.com/frowand/dt_tools [1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@xxxxxxxxx/ Frank Rowand (2): of: unittest: add overlay gpio test to catch gpio hog problem of: unittest: annotate warnings triggered by unittest drivers/of/unittest-data/Makefile | 8 +- drivers/of/unittest-data/overlay_gpio_01.dts | 23 + drivers/of/unittest-data/overlay_gpio_02a.dts | 16 + drivers/of/unittest-data/overlay_gpio_02b.dts | 16 + drivers/of/unittest-data/overlay_gpio_03.dts | 23 + drivers/of/unittest-data/overlay_gpio_04a.dts | 16 + drivers/of/unittest-data/overlay_gpio_04b.dts | 16 + drivers/of/unittest.c | 632 ++++++++++++++++++++++++-- 8 files changed, 719 insertions(+), 31 deletions(-) create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts -- Frank Rowand <frank.rowand@xxxxxxxx>
