linux-kernel - Re: [PATCH 5.11 12/31] gpiolib: Read "gpio-line-names" from a firmware node

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Date:   Fri, 19 Mar 2021 13:27:23 +0100
From:   Marek Vasut <marex@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Roman Guskov <rguskov@...electronics.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.11 12/31] gpiolib: Read "gpio-line-names" from a
 firmware node

On 3/19/21 1:19 PM, Greg Kroah-Hartman wrote:
> From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> 
> [ Upstream commit b41ba2ec54a70908067034f139aa23d0dd2985ce ]
> 
> 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.

I think we agreed to drop this one for now before, see
[PATCH 5.10 081/290] gpiolib: Read "gpio-line-names" from a firmware node
Message-ID: <YFIo3A14Fb4Hty4O@...ah.com>