gpio: delay: Remove duplicative functionality

Now that GPIO aggregator supports a delay line, drop the duplicative
functionality, i.e. the entire gpio-delay driver.
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/Kconfig

@@ -1749,15 +1749,6 @@ config GPIO_AGGREGATOR
 	      industrial control context, to be operated from userspace using
 	      the GPIO chardev interface.
 
-config GPIO_DELAY
-	tristate "GPIO delay"
-	depends on OF_GPIO
-	help
-	  Say yes here to enable the GPIO delay, which provides a way to
-	  configure platform specific delays for GPIO ramp-up or ramp-down
-	  delays. This can serve the following purposes:
-	    - Open-drain output using an RC filter
-
 config GPIO_LATCH
 	tristate "GPIO latch driver"
 	help

drivers/gpio/Makefile

@@ -52,7 +52,6 @@ obj-$(CONFIG_GPIO_DA9052)		+= gpio-da9052.o
 obj-$(CONFIG_GPIO_DA9055)		+= gpio-da9055.o
 obj-$(CONFIG_GPIO_DAVINCI)		+= gpio-davinci.o
 obj-$(CONFIG_GPIO_DLN2)			+= gpio-dln2.o
-obj-$(CONFIG_GPIO_DELAY)		+= gpio-delay.o
 obj-$(CONFIG_GPIO_DWAPB)		+= gpio-dwapb.o
 obj-$(CONFIG_GPIO_EIC_SPRD)		+= gpio-eic-sprd.o
 obj-$(CONFIG_GPIO_ELKHARTLAKE)		+= gpio-elkhartlake.o

drivers/gpio/gpio-delay.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright 2022 TQ-Systems GmbH
- * Author: Alexander Stein <linux@ew.tq-group.com>
- */
-
-#include <linux/err.h>
-#include <linux/gpio/consumer.h>
-#include <linux/gpio/driver.h>
-#include <linux/module.h>
-#include <linux/mod_devicetable.h>
-#include <linux/platform_device.h>
-#include <linux/delay.h>
-
-#include "gpiolib.h"
-
-struct gpio_delay_timing {
-	unsigned long ramp_up_delay_us;
-	unsigned long ramp_down_delay_us;
-};
-
-struct gpio_delay_priv {
-	struct gpio_chip gc;
-	struct gpio_descs *input_gpio;
-	struct gpio_delay_timing *delay_timings;
-};
-
-static int gpio_delay_get_direction(struct gpio_chip *gc, unsigned int offset)
-{
-	return GPIO_LINE_DIRECTION_OUT;
-}
-
-static void gpio_delay_set(struct gpio_chip *gc, unsigned int offset, int val)
-{
-	struct gpio_delay_priv *priv = gpiochip_get_data(gc);
-	struct gpio_desc *gpio_desc = priv->input_gpio->desc[offset];
-	const struct gpio_delay_timing *delay_timings;
-	bool ramp_up;
-
-	gpiod_set_value(gpio_desc, val);
-
-	delay_timings = &priv->delay_timings[offset];
-	ramp_up = (!gpiod_is_active_low(gpio_desc) && val) ||
-		  (gpiod_is_active_low(gpio_desc) && !val);
-
-	if (ramp_up && delay_timings->ramp_up_delay_us)
-		udelay(delay_timings->ramp_up_delay_us);
-	if (!ramp_up && delay_timings->ramp_down_delay_us)
-		udelay(delay_timings->ramp_down_delay_us);
-}
-
-static void gpio_delay_set_can_sleep(struct gpio_chip *gc, unsigned int offset, int val)
-{
-	struct gpio_delay_priv *priv = gpiochip_get_data(gc);
-	struct gpio_desc *gpio_desc = priv->input_gpio->desc[offset];
-	const struct gpio_delay_timing *delay_timings;
-	bool ramp_up;
-
-	gpiod_set_value_cansleep(gpio_desc, val);
-
-	delay_timings = &priv->delay_timings[offset];
-	ramp_up = (!gpiod_is_active_low(gpio_desc) && val) ||
-		  (gpiod_is_active_low(gpio_desc) && !val);
-
-	if (ramp_up && delay_timings->ramp_up_delay_us)
-		fsleep(delay_timings->ramp_up_delay_us);
-	if (!ramp_up && delay_timings->ramp_down_delay_us)
-		fsleep(delay_timings->ramp_down_delay_us);
-}
-
-static int gpio_delay_of_xlate(struct gpio_chip *gc,
-			       const struct of_phandle_args *gpiospec,
-			       u32 *flags)
-{
-	struct gpio_delay_priv *priv = gpiochip_get_data(gc);
-	struct gpio_delay_timing *timings;
-	u32 line;
-
-	if (gpiospec->args_count != gc->of_gpio_n_cells)
-		return -EINVAL;
-
-	line = gpiospec->args[0];
-	if (line >= gc->ngpio)
-		return -EINVAL;
-
-	timings = &priv->delay_timings[line];
-	timings->ramp_up_delay_us = gpiospec->args[1];
-	timings->ramp_down_delay_us = gpiospec->args[2];
-
-	return line;
-}
-
-static bool gpio_delay_can_sleep(const struct gpio_delay_priv *priv)
-{
-	int i;
-
-	for (i = 0; i < priv->input_gpio->ndescs; i++)
-		if (gpiod_cansleep(priv->input_gpio->desc[i]))
-			return true;
-
-	return false;
-}
-
-static int gpio_delay_probe(struct platform_device *pdev)
-{
-	struct gpio_delay_priv *priv;
-
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	priv->input_gpio = devm_gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
-	if (IS_ERR(priv->input_gpio))
-		return dev_err_probe(&pdev->dev, PTR_ERR(priv->input_gpio),
-				     "Failed to get input-gpios");
-
-	priv->delay_timings = devm_kcalloc(&pdev->dev,
-					   priv->input_gpio->ndescs,
-					   sizeof(*priv->delay_timings),
-					   GFP_KERNEL);
-	if (!priv->delay_timings)
-		return -ENOMEM;
-
-	if (gpio_delay_can_sleep(priv)) {
-		priv->gc.can_sleep = true;
-		priv->gc.set = gpio_delay_set_can_sleep;
-	} else {
-		priv->gc.can_sleep = false;
-		priv->gc.set = gpio_delay_set;
-	}
-
-	priv->gc.get_direction = gpio_delay_get_direction;
-	priv->gc.of_xlate = gpio_delay_of_xlate;
-	priv->gc.of_gpio_n_cells = 3;
-	priv->gc.ngpio = priv->input_gpio->ndescs;
-	priv->gc.owner = THIS_MODULE;
-	priv->gc.base = -1;
-	priv->gc.parent = &pdev->dev;
-
-	platform_set_drvdata(pdev, priv);
-
-	return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
-}
-
-static const struct of_device_id gpio_delay_ids[] = {
-	{
-		.compatible = "gpio-delay",
-	},
-	{ /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, gpio_delay_ids);
-
-static struct platform_driver gpio_delay_driver = {
-	.driver	= {
-		.name		= "gpio-delay",
-		.of_match_table	= gpio_delay_ids,
-	},
-	.probe	= gpio_delay_probe,
-};
-module_platform_driver(gpio_delay_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Alexander Stein <alexander.stein@ew.tq-group.com>");
-MODULE_DESCRIPTION("GPIO delay driver");