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Date:   Mon, 8 Mar 2021 13:45:06 +0200
From:   Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To:     Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc:     linux-gpio <linux-gpio@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Marek Vasut <marex@denx.de>,
        Roman Guskov <rguskov@dh-electronics.com>
Subject: Re: [PATCH v1 1/1] gpiolib: Read "gpio-line-names" from a firmware
 node
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On Sun, Mar 07, 2021 at 06:14:49PM +0200, Andy Shevchenko wrote:
> On Sun, Mar 7, 2021 at 4:22 PM Bartosz Golaszewski
> <bgolaszewski@baylibre.com> wrote:
> > On Fri, Mar 5, 2021 at 1:02 PM Andy Shevchenko
> > <andriy.shevchenko@linux.intel.com> wrote:
> > >
> > > On STM32MP1, the GPIO banks are subnodes of pin-controller@50002000,
> > > see arch/arm/boot/dts/stm32mp151.dtsi. The driver for
> > > pin-controller@50002000 is in drivers/pinctrl/stm32/pinctrl-stm32.c
> > > and iterates over all of its DT subnodes when registering each GPIO
> > > bank gpiochip. Each gpiochip has:
> > >
> > >   - gpio_chip.parent = dev,
> > >     where dev is the device node of the pin controller
> > >   - gpio_chip.of_node = np,
> > >     which is the OF node of the GPIO bank
> > >
> > > Therefore, dev_fwnode(chip->parent) != of_fwnode_handle(chip.of_node),
> > > i.e. pin-controller@50002000 != pin-controller@50002000/gpio@5000*000.
> > >
> > > The original code behaved correctly, as it extracted the "gpio-line-names"
> > > from of_fwnode_handle(chip.of_node) = pin-controller@50002000/gpio@5000*000.
> > >
> > > To achieve the same behaviour, read property from the firmware node.

...

> > Did you run the OF unit tests on this? The check for the parent dev
> > was added after a bug was reported that was only triggered in unit
> > tests.
> 
> Parent is not used anymore. But I can run unittests next week (or if
> you know that they are failing now, can you please show the failure?).

For the record:
[   40.587868] ### dt-test ### end of unittest - 190 passed, 0 failed

If you have tests failed, we need more information about what line fails, etc.

-- 
With Best Regards,
Andy Shevchenko