linux-kernel - Re: [PATCH v6 10/15] gpio: devres: Add devm_gpiod_get_parent

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Date:   Mon, 16 Dec 2019 09:29:51 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-rtc@...r.kernel.org
Subject: Re: [PATCH v6 10/15] gpio: devres: Add devm_gpiod_get_parent_array

On Wed, Dec 11, 2019 at 10:47 AM Matti Vaittinen
<matti.vaittinen@...rohmeurope.com> wrote:

> Bunch of MFD sub-devices which are instantiated by MFD do not have
> own device-tree nodes but have (for example) the GPIO consumer
> information in parent device's DT node. Add resource managed
> devm_gpiod_get_array() for such devices so that they can get the
> consumer information from parent DT while still binding the GPIO
> reservation life-time to this sub-device life time.
>
> If devm_gpiod_get_array is used as such - then unloading and then
> re-loading the child device fails as the GPIOs reserved during first
> load are not freed when driver for sub-device is unload (if parent
> stays there).
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> ---
>
> Changes since v5:
> - renamed internal function (no __ - prefixes for Linus :] )

Thanks, as there are things happening in the GPIO subsystem I
have put this one patch on an immutable branch here:
https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git/log/?h=ib-devm-gpiod-get-parent-array

Please ask the maintainer (I guess Lee?) to pull this into wherever
the rest of the patches should be merged if you want patches beyond
this point to be applied for the next (v5.6) merge window, then this
patch is not needed in the series.

Yours,
Linus Walleij