gpiolib: split of_mm_gpio_chip out of linux/of_gpio.h

This is a rarely used feature that has nothing to do with the
client-side of_gpio.h.

Split it out with a separate header file and Kconfig option
so it can be removed on its own timeline aside from removing
the of_gpio consumer interfaces.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/include/linux/gpio/legacy-of-mm-gpiochip.h b/include/linux/gpio/legacy-of-mm-gpiochip.h
new file mode 100644
index 000000000000..2e2bd3b19cc3
--- /dev/null
+++ b/include/linux/gpio/legacy-of-mm-gpiochip.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * OF helpers for the old of_mm_gpio_chip, used on ppc32 and nios2,
+ * do not use in new code.
+ *
+ * Copyright (c) 2007-2008  MontaVista Software, Inc.
+ *
+ * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
+ */
+
+#ifndef __LINUX_GPIO_LEGACY_OF_MM_GPIO_CHIP_H
+#define __LINUX_GPIO_LEGACY_OF_MM_GPIO_CHIP_H
+
+#include <linux/gpio/driver.h>
+#include <linux/of.h>
+
+/*
+ * OF GPIO chip for memory mapped banks
+ */
+struct of_mm_gpio_chip {
+	struct gpio_chip gc;
+	void (*save_regs)(struct of_mm_gpio_chip *mm_gc);
+	void __iomem *regs;
+};
+
+static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
+{
+	return container_of(gc, struct of_mm_gpio_chip, gc);
+}
+
+extern int of_mm_gpiochip_add_data(struct device_node *np,
+				   struct of_mm_gpio_chip *mm_gc,
+				   void *data);
+extern void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc);
+
+#endif /* __LINUX_GPIO_LEGACY_OF_MM_GPIO_CHIP_H */