powerpc/sysdev: drop simple gpio

There is a config item CONFIG_SIMPLE_GPIO which
provides simple memory mapped GPIOs specific to powerpc.

However, the only platform which selects this option is
mpc5200, and this platform doesn't use it.

There are three boards calling simple_gpiochip_init(), but
as they don't select CONFIG_SIMPLE_GPIO, this is just a nop.

Simple_gpio is just redundant with the generic MMIO GPIO
driver which can be found in driver/gpio/ and selected via
CONFIG_GPIO_GENERIC_PLATFORM, so drop simple_gpio driver.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bf930402613b41b42d0441b784e0cc43fc18d1fb.1572529632.git.christophe.leroy@c-s.fr

1 files changed, 0 insertions, 143 deletions

diff --git a/arch/powerpc/sysdev/simple_gpio.c b/arch/powerpc/sysdev/simple_gpio.c
deleted file mode 100644
index dc1740cd9e42..000000000000
--- a/arch/powerpc/sysdev/simple_gpio.c
+++ /dev/null
@@ -1,143 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Simple Memory-Mapped GPIOs
- *
- * Copyright (c) MontaVista Software, Inc. 2008.
- *
- * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
- */
-
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-#include <linux/ioport.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_gpio.h>
-#include <linux/gpio/driver.h>
-#include <linux/slab.h>
-#include <asm/prom.h>
-#include "simple_gpio.h"
-
-struct u8_gpio_chip {
-	struct of_mm_gpio_chip mm_gc;
-	spinlock_t lock;
-
-	/* shadowed data register to clear/set bits safely */
-	u8 data;
-};
-
-static u8 u8_pin2mask(unsigned int pin)
-{
-	return 1 << (8 - 1 - pin);
-}
-
-static int u8_gpio_get(struct gpio_chip *gc, unsigned int gpio)
-{
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-
-	return !!(in_8(mm_gc->regs) & u8_pin2mask(gpio));
-}
-
-static void u8_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
-{
-	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
-	struct u8_gpio_chip *u8_gc = gpiochip_get_data(gc);
-	unsigned long flags;
-
-	spin_lock_irqsave(&u8_gc->lock, flags);
-
-	if (val)
-		u8_gc->data |= u8_pin2mask(gpio);
-	else
-		u8_gc->data &= ~u8_pin2mask(gpio);
-
-	out_8(mm_gc->regs, u8_gc->data);
-
-	spin_unlock_irqrestore(&u8_gc->lock, flags);
-}
-
-static int u8_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
-{
-	return 0;
-}
-
-static int u8_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
-{
-	u8_gpio_set(gc, gpio, val);
-	return 0;
-}
-
-static void u8_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
-{
-	struct u8_gpio_chip *u8_gc =
-		container_of(mm_gc, struct u8_gpio_chip, mm_gc);
-
-	u8_gc->data = in_8(mm_gc->regs);
-}
-
-static int __init u8_simple_gpiochip_add(struct device_node *np)
-{
-	int ret;
-	struct u8_gpio_chip *u8_gc;
-	struct of_mm_gpio_chip *mm_gc;
-	struct gpio_chip *gc;
-
-	u8_gc = kzalloc(sizeof(*u8_gc), GFP_KERNEL);
-	if (!u8_gc)
-		return -ENOMEM;
-
-	spin_lock_init(&u8_gc->lock);
-
-	mm_gc = &u8_gc->mm_gc;
-	gc = &mm_gc->gc;
-
-	mm_gc->save_regs = u8_gpio_save_regs;
-	gc->ngpio = 8;
-	gc->direction_input = u8_gpio_dir_in;
-	gc->direction_output = u8_gpio_dir_out;
-	gc->get = u8_gpio_get;
-	gc->set = u8_gpio_set;
-
-	ret = of_mm_gpiochip_add_data(np, mm_gc, u8_gc);
-	if (ret)
-		goto err;
-	return 0;
-err:
-	kfree(u8_gc);
-	return ret;
-}
-
-void __init simple_gpiochip_init(const char *compatible)
-{
-	struct device_node *np;
-
-	for_each_compatible_node(np, NULL, compatible) {
-		int ret;
-		struct resource r;
-
-		ret = of_address_to_resource(np, 0, &r);
-		if (ret)
-			goto err;
-
-		switch (resource_size(&r)) {
-		case 1:
-			ret = u8_simple_gpiochip_add(np);
-			if (ret)
-				goto err;
-			break;
-		default:
-			/*
-			 * Whenever you need support for GPIO bank width > 1,
-			 * please just turn u8_ code into huge macros, and
-			 * construct needed uX_ code with it.
-			 */
-			ret = -ENOSYS;
-			goto err;
-		}
-		continue;
-err:
-		pr_err("%pOF: registration failed, status %d\n", np, ret);
-	}
-}