ARM: 5754/1: ep93xx: update i2c support

Update the ep93xx i2c support:

  1) The platform init code passes the configuration data for the
     i2c-gpio driver.  This allows any gpio pin do be used for the
     sda and scl pins.  It also allows the platform to specify the
     udelay and timeout.
  2) Program the gpio configuration register to enable/disable the
     open drain drivers.  Note that this really only works if the
     sda and scl pins are set to EP93XX_GPIO_LINE_EEDAT and
     EP93XX_GPIO_LINE_EECLK.
  3) Update the edb93xx.c platform init to use the new support.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Ryan Mallon <ryan@bluewatersys.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 23 insertions, 8 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);
 }