From 7b85b867b99044da93f83851c806d1e324d49ed5 Mon Sep 17 00:00:00 2001
From: Linus Walleij
Date: Mon, 9 Sep 2013 16:39:51 +0200
Subject: ARM: plat-iop: instantiate GPIO from platform device

This converts the IOP32x and IOP33x platforms to pass their
base address offset by a resource attached to a platform device
instead of using static offset macros implicitly passed
through <linux/gpio.h> including <mach/gpio.h>. Delete the
local <mach/gpio.h> and <asm/hardware/iop3xx-gpio.h> headers
and remove the selection of NEED_MACH_GPIO_H.

Pass the virtual address as a resource in the platform device
at this point for bisectability, next patch will pass the
physical address as is custom.

Cc: Lennert Buytenhek <kernel@wantstofly.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mikael Pettersson <mikpe@it.uu.se>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpio/gpio-iop.c | 36 ++++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

(limited to 'drivers/gpio/gpio-iop.c')

diff --git a/drivers/gpio/gpio-iop.c b/drivers/gpio/gpio-iop.c
index 17cc7010cd04..24a86b05dc8c 100644
--- a/drivers/gpio/gpio-iop.c
+++ b/drivers/gpio/gpio-iop.c
@@ -16,9 +16,23 @@
 #include <linux/errno.h>
 #include <linux/gpio.h>
 #include <linux/export.h>
+#include <linux/platform_device.h>
 
 #define IOP3XX_N_GPIOS	8
 
+#define GPIO_IN			0
+#define GPIO_OUT		1
+#define GPIO_LOW		0
+#define GPIO_HIGH		1
+
+/* Memory base offset */
+static void __iomem *base;
+
+#define IOP3XX_GPIO_REG(reg)	(base + (reg))
+#define IOP3XX_GPOE		(volatile u32 *)IOP3XX_GPIO_REG(0x0000)
+#define IOP3XX_GPID		(volatile u32 *)IOP3XX_GPIO_REG(0x0004)
+#define IOP3XX_GPOD		(volatile u32 *)IOP3XX_GPIO_REG(0x0008)
+
 static void gpio_line_config(int line, int direction)
 {
 	unsigned long flags;
@@ -83,8 +97,26 @@ static struct gpio_chip iop3xx_chip = {
 	.ngpio			= IOP3XX_N_GPIOS,
 };
 
-static int __init iop3xx_gpio_setup(void)
+static int iop3xx_gpio_probe(struct platform_device *pdev)
 {
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = (void *) res->start;
+
 	return gpiochip_add(&iop3xx_chip);
 }
-arch_initcall(iop3xx_gpio_setup);
+
+static struct platform_driver iop3xx_gpio_driver = {
+	.driver = {
+		.name = "gpio-iop",
+		.owner = THIS_MODULE,
+	},
+	.probe = iop3xx_gpio_probe,
+};
+
+static int __init iop3xx_gpio_init(void)
+{
+	return platform_driver_register(&iop3xx_gpio_driver);
+}
+arch_initcall(iop3xx_gpio_init);
-- 
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