linux-kernel - [PATCH 2/2] gpio: rockchip: request GPIO mux to pinctrl when setting direction

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Message-Id: <20220923145141.3463754-3-foss+kernel@0leil.net>
Date:   Fri, 23 Sep 2022 16:51:41 +0200
From:   Quentin Schulz <foss+kernel@...il.net>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linus.walleij@...aro.org, brgl@...ev.pl, heiko@...ech.de,
        jay.xu@...k-chips.com, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        foss+kernel@...il.net,
        Quentin Schulz <quentin.schulz@...obroma-systems.com>,
        stable@...r.kernel.org
Subject: [PATCH 2/2] gpio: rockchip: request GPIO mux to pinctrl when setting direction

From: Quentin Schulz <quentin.schulz@...obroma-systems.com>

Before the split of gpio and pinctrl sections in their own driver,
rockchip_set_mux was called in pinmux_ops.gpio_set_direction for
configuring a pin in its GPIO function.

This is essential for cases where pinctrl is "bypassed" by gpio
consumers otherwise the GPIO function is not configured for the pin and
it does not work. Such was the case for the sysfs/libgpiod userspace
GPIO handling.

Let's call pinctrl_gpio_direction_input/output when setting the
direction of a GPIO so that the pinctrl core requests from the rockchip
pinctrl driver to put the pin in its GPIO function.

Fixes: 9ce9a02039de ("pinctrl/rockchip: drop the gpio related codes")
Fixes: 936ee2675eee ("gpio/rockchip: add driver for rockchip gpio")
Cc: stable@...r.kernel.org
Signed-off-by: Quentin Schulz <quentin.schulz@...obroma-systems.com>
---
 drivers/gpio/gpio-rockchip.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index bb50335239ac8..b83913e1ee49e 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -156,6 +156,12 @@ static int rockchip_gpio_set_direction(struct gpio_chip *chip,
 	unsigned long flags;
 	u32 data = input ? 0 : 1;
 
+
+	if (input)
+		pinctrl_gpio_direction_input(bank->pin_base + offset);
+	else
+		pinctrl_gpio_direction_output(bank->pin_base + offset);
+
 	raw_spin_lock_irqsave(&bank->slock, flags);
 	rockchip_gpio_writel_bit(bank, offset, data, bank->gpio_regs->port_ddr);
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
-- 
2.37.3