gpio: rockchip: Stop calling pinctrl for set_direction

Marking the whole controller as sleeping due to the pinctrl calls in the
.direction_{input,output} callbacks has the unfortunate side effect that
legitimate invocations of .get and .set, which cannot themselves sleep,
in atomic context now spew WARN()s from gpiolib.

However, as Heiko points out, the driver doing this is a bit silly to
begin with, as the pinctrl .gpio_set_direction hook doesn't even care
about the direction, the hook is only used to claim the mux. And sure
enough, the .gpio_request_enable hook exists to serve this very purpose,
so switch to that and remove the problematic business entirely.

Cc: [e-mail]
Fixes: 20cf2aed89ac ("gpio: rockchip: mark the GPIO controller as sleeping")
Suggested-by: Heiko Stuebner <[e-mail]>
Signed-off-by: Robin Murphy <[e-mail]>
Reviewed-by: Heiko Stuebner <[e-mail]>
Link: https://lore.kernel.org/r/bddc[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-rockchip.c

···
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
-#include <linux/pinctrl/consumer.h>
 #include <linux/pinctrl/pinconf-generic.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
···
 	struct rockchip_pin_bank *bank = gpiochip_get_data(chip);
 	unsigned long flags;
 	u32 data = input ? 0 : 1;
-
-
-	if (input)
-		pinctrl_gpio_direction_input(chip, offset);
-	else
-		pinctrl_gpio_direction_output(chip, offset);
 
 	raw_spin_lock_irqsave(&bank->slock, flags);
 	rockchip_gpio_writel_bit(bank, offset, data, bank->gpio_regs->port_ddr);
···
 	gc->ngpio = bank->nr_pins;
 	gc->label = bank->name;
 	gc->parent = bank->dev;
-	gc->can_sleep = true;
 
 	ret = gpiochip_add_data(gc, bank);
 	if (ret) {

drivers/pinctrl/pinctrl-rockchip.c

···
 	return 0;
 }
 
-static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
-					   struct pinctrl_gpio_range *range,
-					   unsigned offset,
-					   bool input)
+static int rockchip_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
+					    struct pinctrl_gpio_range *range,
+					    unsigned int offset)
 {
 	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
 	struct rockchip_pin_bank *bank;
···
 	.get_function_name	= rockchip_pmx_get_func_name,
 	.get_function_groups	= rockchip_pmx_get_groups,
 	.set_mux		= rockchip_pmx_set,
-	.gpio_set_direction	= rockchip_pmx_gpio_set_direction,
+	.gpio_request_enable	= rockchip_pmx_gpio_request_enable,
 };
 
 /*