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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <brgl@bgdev.pl>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>
Cc: bcm-kernel-feedback-list@broadcom.com,
	Nicolas Saenz Julienne <nsaenz@kernel.org>,
	Phil Elwell <phil@raspberrypi.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Stefan Wahren <stefan.wahren@i2se.com>
Subject: [PATCH 0/2] gpiolib: of: Introduce hook for missing gpio-ranges
Date: Sat,  9 Apr 2022 11:51:27 +0200	[thread overview]
Message-ID: <20220409095129.45786-1-stefan.wahren@i2se.com> (raw)

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


             reply	other threads:[~2022-04-09 10:05 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-09  9:51 Stefan Wahren [this message]
2022-04-09  9:51 ` [PATCH 1/2] " Stefan Wahren
2022-04-09  9:51 ` [PATCH 2/2] pinctrl: bcm2835: implement " Stefan Wahren
2022-04-19 21:18 ` [PATCH 0/2] gpiolib: of: Introduce " Linus Walleij

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