linux-kernel - [PATCH 0/2] gpiolib: of: Introduce hook for missing gpio-ranges

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Message-Id: <20220409095129.45786-1-stefan.wahren@i2se.com>
Date:   Sat,  9 Apr 2022 11:51:27 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>
Cc:     bcm-kernel-feedback-list@...adcom.com,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Phil Elwell <phil@...pberrypi.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Stefan Wahren <stefan.wahren@...e.com>
Subject: [PATCH 0/2] gpiolib: of: Introduce hook for missing gpio-ranges

This patch series tries to provide backward compatibility for DTB which
lacks the gpio-ranges property.

The commit ("pinctrl: msm: fix gpio-hog related boot issues") by Christian
Lamparter already contains a fallback in case the gpio-ranges property
is missing. But this approach doesn't work on BCM2835 with a gpio-hog
defined for the SoC GPIOs.

Based Christian's on explanation i conclude that the fallback must happen
during the gpiochip_add() call and not afterwards. So the approach is to
call an optional hook, which can be implemented in the platform driver.

This series has been tested on Raspberry Pi 3 B Plus.

Changes since RFC:
- just add all collected Fixes, Reviewed-by, Tested-by and Acked-by

Stefan Wahren (2):
  gpiolib: of: Introduce hook for missing gpio-ranges
  pinctrl: bcm2835: implement hook for missing gpio-ranges

 drivers/gpio/gpiolib-of.c             |  5 +++++
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 18 ++++++++++++++++++
 include/linux/gpio/driver.h           | 12 ++++++++++++
 3 files changed, 35 insertions(+)

-- 
2.25.1