4 files changed, 51 insertions, 16 deletions

diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index f7ebed942f66..f95dc160c34b 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -550,13 +550,11 @@ void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
 	platform_device_register(&ep93xx_eth_device);
 }
 
-static struct i2c_gpio_platform_data ep93xx_i2c_data = {
-	.sda_pin		= EP93XX_GPIO_LINE_EEDAT,
-	.sda_is_open_drain	= 0,
-	.scl_pin		= EP93XX_GPIO_LINE_EECLK,
-	.scl_is_open_drain	= 0,
-	.udelay			= 2,
-};
+
+/*************************************************************************
+ * EP93xx i2c peripheral handling
+ *************************************************************************/
+static struct i2c_gpio_platform_data ep93xx_i2c_data;
 
 static struct platform_device ep93xx_i2c_device = {
 	.name			= "i2c-gpio",
@@ -564,8 +562,25 @@ static struct platform_device ep93xx_i2c_device = {
 	.dev.platform_data	= &ep93xx_i2c_data,
 };
 
-void __init ep93xx_register_i2c(struct i2c_board_info *devices, int num)
+void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
+				struct i2c_board_info *devices, int num)
 {
+	/*
+	 * Set the EEPROM interface pin drive type control.
+	 * Defines the driver type for the EECLK and EEDAT pins as either
+	 * open drain, which will require an external pull-up, or a normal
+	 * CMOS driver.
+	 */
+	if (data->sda_is_open_drain && data->sda_pin != EP93XX_GPIO_LINE_EEDAT)
+		pr_warning("ep93xx: sda != EEDAT, open drain has no effect\n");
+	if (data->scl_is_open_drain && data->scl_pin != EP93XX_GPIO_LINE_EECLK)
+		pr_warning("ep93xx: scl != EECLK, open drain has no effect\n");
+
+	__raw_writel((data->sda_is_open_drain << 1) |
+		     (data->scl_is_open_drain << 0),
+		     EP93XX_GPIO_EEDRIVE);
+
+	ep93xx_i2c_data = *data;
 	i2c_register_board_info(0, devices, num);
 	platform_device_register(&ep93xx_i2c_device);
 }
diff --git a/arch/arm/mach-ep93xx/edb93xx.c b/arch/arm/mach-ep93xx/edb93xx.c
index 73145ae5d3fa..ca71cf1a72a0 100644
--- a/arch/arm/mach-ep93xx/edb93xx.c
+++ b/arch/arm/mach-ep93xx/edb93xx.c
@@ -27,8 +27,10 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
-#include <linux/i2c.h>
 #include <linux/mtd/physmap.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/i2c-gpio.h>
 
 #include <mach/hardware.h>
 
@@ -76,13 +78,26 @@ static struct ep93xx_eth_data edb93xx_eth_data = {
 	.phy_id		= 1,
 };
 
-static struct i2c_board_info __initdata edb93xxa_i2c_data[] = {
+
+/*************************************************************************
+ * EDB93xx i2c peripheral handling
+ *************************************************************************/
+static struct i2c_gpio_platform_data edb93xx_i2c_gpio_data = {
+	.sda_pin		= EP93XX_GPIO_LINE_EEDAT,
+	.sda_is_open_drain	= 0,
+	.scl_pin		= EP93XX_GPIO_LINE_EECLK,
+	.scl_is_open_drain	= 0,
+	.udelay			= 0,	/* default to 100 kHz */
+	.timeout		= 0,	/* default to 100 ms */
+};
+
+static struct i2c_board_info __initdata edb93xxa_i2c_board_info[] = {
 	{
 		I2C_BOARD_INFO("isl1208", 0x6f),
 	},
 };
 
-static struct i2c_board_info __initdata edb93xx_i2c_data[] = {
+static struct i2c_board_info __initdata edb93xx_i2c_board_info[] = {
 	{
 		I2C_BOARD_INFO("ds1337", 0x68),
 	},
@@ -92,12 +107,14 @@ static void __init edb93xx_register_i2c(void)
 {
 	if (machine_is_edb9302a() || machine_is_edb9307a() ||
 	    machine_is_edb9315a()) {
-		ep93xx_register_i2c(edb93xxa_i2c_data,
-				ARRAY_SIZE(edb93xxa_i2c_data));
+		ep93xx_register_i2c(&edb93xx_i2c_gpio_data,
+				    edb93xxa_i2c_board_info,
+				    ARRAY_SIZE(edb93xxa_i2c_board_info));
 	} else if (machine_is_edb9307() || machine_is_edb9312() ||
 		   machine_is_edb9315()) {
-		ep93xx_register_i2c(edb93xx_i2c_data,
-				ARRAY_SIZE(edb93xx_i2c_data));
+		ep93xx_register_i2c(&edb93xx_i2c_gpio_data
+				    edb93xx_i2c_board_info,
+				    ARRAY_SIZE(edb93xx_i2c_board_info));
 	}
 }
 
diff --git a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
index aae72b8ab236..b1f937eda29c 100644
--- a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
+++ b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
@@ -117,6 +117,7 @@
 #define EP93XX_GPIO_F_INT_STATUS	EP93XX_GPIO_REG(0x5c)
 #define EP93XX_GPIO_A_INT_STATUS	EP93XX_GPIO_REG(0xa0)
 #define EP93XX_GPIO_B_INT_STATUS	EP93XX_GPIO_REG(0xbc)
+#define EP93XX_GPIO_EEDRIVE		EP93XX_GPIO_REG(0xc8)
 
 #define EP93XX_AAC_BASE			EP93XX_APB_IOMEM(0x00080000)
 
diff --git a/arch/arm/mach-ep93xx/include/mach/platform.h b/arch/arm/mach-ep93xx/include/mach/platform.h
index 01a0f0838e5b..a3ec33fd79d4 100644
--- a/arch/arm/mach-ep93xx/include/mach/platform.h
+++ b/arch/arm/mach-ep93xx/include/mach/platform.h
@@ -4,6 +4,7 @@
 
 #ifndef __ASSEMBLY__
 
+struct i2c_gpio_platform_data;
 struct i2c_board_info;
 struct platform_device;
 struct ep93xxfb_mach_info;
@@ -33,7 +34,8 @@ static inline void ep93xx_devcfg_clear_bits(unsigned int bits)
 }
 
 void ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr);
-void ep93xx_register_i2c(struct i2c_board_info *devices, int num);
+void ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
+			 struct i2c_board_info *devices, int num);
 void ep93xx_register_fb(struct ep93xxfb_mach_info *data);
 void ep93xx_register_pwm(int pwm0, int pwm1);
 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev);