linux-kernel - [PATCH AUTOSEL 5.4 4/8] pinctrl: at91: make it work with current gpiolib

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Message-ID: <20240903192859.1108979-4-sashal@kernel.org>
Date: Tue,  3 Sep 2024 15:28:40 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Thomas Blocher <thomas.blocher@...dev.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Sasha Levin <sashal@...nel.org>,
	ludovic.desroches@...rochip.com,
	nicolas.ferre@...rochip.com,
	alexandre.belloni@...tlin.com,
	claudiu.beznea@...on.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-gpio@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 4/8] pinctrl: at91: make it work with current gpiolib

From: Thomas Blocher <thomas.blocher@...dev.de>

[ Upstream commit 752f387faaae0ae2e84d3f496922524785e77d60 ]

pinctrl-at91 currently does not support the gpio-groups devicetree
property and has no pin-range.
Because of this at91 gpios stopped working since patch
commit 2ab73c6d8323fa1e ("gpio: Support GPIO controllers without pin-ranges")
This was discussed in the patches
commit fc328a7d1fcce263 ("gpio: Revert regression in sysfs-gpio (gpiolib.c)")
commit 56e337f2cf132632 ("Revert "gpio: Revert regression in sysfs-gpio (gpiolib.c)"")

As a workaround manually set pin-range via gpiochip_add_pin_range() until
a) pinctrl-at91 is reworked to support devicetree gpio-groups
b) another solution as mentioned in
commit 56e337f2cf132632 ("Revert "gpio: Revert regression in sysfs-gpio (gpiolib.c)"")
is found

Signed-off-by: Thomas Blocher <thomas.blocher@...dev.de>
Link: https://lore.kernel.org/5b992862-355d-f0de-cd3d-ff99e67a4ff1@ek-dev.de
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pinctrl/pinctrl-at91.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 39a55fd85b192..4e6e151db11f2 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -1398,8 +1398,11 @@ static int at91_pinctrl_probe(struct platform_device *pdev)
 
 	/* We will handle a range of GPIO pins */
 	for (i = 0; i < gpio_banks; i++)
-		if (gpio_chips[i])
+		if (gpio_chips[i]) {
 			pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
+			gpiochip_add_pin_range(&gpio_chips[i]->chip, dev_name(info->pctl->dev), 0,
+				gpio_chips[i]->range.pin_base, gpio_chips[i]->range.npins);
+		}
 
 	dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
 
-- 
2.43.0