linux-kernel - Re: [PATCH 0/6] Add support for software nodes to gpiolib

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Date:   Fri, 4 Nov 2022 16:50:09 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-acpi@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] Add support for software nodes to gpiolib

On Fri, Nov 4, 2022 at 7:10 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> This series attempts to add support for software nodes to gpiolib, using
> software node references. This allows us to convert more drivers to the
> generic device properties and drop support for custom platform data.
>
> To describe a GPIO via software nodes we can create the following data
> items:
>
> /* Node representing the GPIO controller/GPIO bank */
> static const struct software_node gpio_bank_b_node = {
>         .name = "B",
> };
>
> /*
>  * Properties that will be assigned to a software node assigned to
>  * the devicei that used platform data.
>  */
> static const struct property_entry simone_key_enter_props[] = {
>         PROPERTY_ENTRY_U32("linux,code", KEY_ENTER),
>         PROPERTY_ENTRY_STRING("label", "enter"),
>         PROPERTY_ENTRY_REF("gpios", &gpio_bank_b_node, 123, GPIO_ACTIVE_LOW),
>         { }
> };
>
> The code in gpiolib handling software nodes uses the name in the
> software node representing GPIO controller to locate the actual instance
> of GPIO controller.
>
> Note that kbuild robot is likely to complain about this patchset because
> it depends on patches removing [devm_]gpiod_get_from_of_node() and
> devm_fwnode_get_[index_]gpiod_from_child() APIs that are still pending.
> I pushed them to
>
> git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git tmp-gpiolib
>
> for your reference.
>
> To: Linus Walleij <linus.walleij@...aro.org>
> To: Bartosz Golaszewski <brgl@...ev.pl>
> To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: linux-gpio@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-acpi@...r.kernel.org
>
> ---
> Dmitry Torokhov (6):
>       gpiolib: of: change of_find_gpio() to accept device node
>       gpiolib: acpi: change acpi_find_gpio() to accept firmware node
>       gpiolib: acpi: teach acpi_find_gpio() to handle data-only nodes
>       gpiolib: acpi: avoid leaking ACPI details into upper gpiolib layers
>       gpiolib: consolidate GPIO lookups
>       gpiolib: add support for software nodes
>
>  drivers/gpio/Makefile         |   1 +
>  drivers/gpio/gpiolib-acpi.c   | 132 +++++++++++++----------
>  drivers/gpio/gpiolib-acpi.h   |  54 +---------
>  drivers/gpio/gpiolib-of.c     |  52 +--------
>  drivers/gpio/gpiolib-of.h     |  16 +--
>  drivers/gpio/gpiolib-swnode.c | 106 +++++++++++++++++++
>  drivers/gpio/gpiolib-swnode.h |  13 +++
>  drivers/gpio/gpiolib.c        | 239 ++++++++++++++++++++----------------------
>  8 files changed, 316 insertions(+), 297 deletions(-)
> ---
> base-commit: dc04f5ab1b1114aa19b9026f816fc01ca9c9941d
> change-id: 20221031-gpiolib-swnode-948203f49b23
>
> --
> Dmitry
>

This is great work. I'll wait for Andy to Ack the ACPI patches and
let's get it in.

Bartosz