linux-kernel - Re: [PATCH v1 1/1] gpiolib: Read "gpio-line-names" from a firmware node

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Date:   Fri, 5 Mar 2021 14:24:57 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Marek Vasut <marex@...x.de>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Roman Guskov <rguskov@...electronics.com>
Subject: Re: [PATCH v1 1/1] gpiolib: Read "gpio-line-names" from a firmware
 node

On Fri, Mar 05, 2021 at 01:11:39PM +0100, Marek Vasut wrote:
> On 3/5/21 1:02 PM, Andy Shevchenko wrote:
> > On STM32MP1, the GPIO banks are subnodes of pin-controller@...02000,
> > see arch/arm/boot/dts/stm32mp151.dtsi. The driver for
> > pin-controller@...02000 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@...02000 != pin-controller@...02000/gpio@...0*000.
> > 
> > The original code behaved correctly, as it extracted the "gpio-line-names"
> > from of_fwnode_handle(chip.of_node) = pin-controller@...02000/gpio@...0*000.
> > 
> > To achieve the same behaviour, read property from the firmware node.
> > 
> > Fixes: 7cba1a4d5e162 ("gpiolib: generalize devprop_gpiochip_set_names() for device properties")
> > Reported-by: Marek Vasut <marex@...x.de>
> > Reported-by: Roman Guskov <rguskov@...electronics.com>
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> 
> Tested-by: Marek Vasut <marex@...x.de>
> Reviewed-by: Marek Vasut <marex@...x.de>

Thanks!

> Thanks
> 
> >   static int devprop_gpiochip_set_names(struct gpio_chip *chip)
> >   {
> >   	struct gpio_device *gdev = chip->gpiodev;
> > -	struct device *dev = chip->parent;
> > +	struct fwnode_handle *fwnode = dev_fwnode(&gdev->dev);
> 
> You could make the order here a reverse xmas tree, but that's a nitpick.

They are dependent, can't be reordered.

-- 
With Best Regards,
Andy Shevchenko