i2c: nomadik: Add default configuration into the Nomadik I2C driver

At this moment in time there is only one known configuration for the
Nomadik I2C driver. By not holding that configuration in the driver
adds some unnecessary overhead in platform code. The configuration
has already been removed from platform code, this patch checks for any
over-riding configurations. If there aren't any, the default is used.

[LinusW says: "Right now this is causing boot regressions so we need it
badly..."]

Acked-by: srinidhi kasagar <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

Author: Lee Jones

drivers/i2c/busses/i2c-nomadik.c

@@ -350,10 +350,6 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
 
 	i2c_clk = clk_get_rate(dev->clk);
 
-	/* fallback to std. mode if machine has not provided it */
-	if (dev->cfg.clk_freq == 0)
-		dev->cfg.clk_freq = 100000;
-
 	/*
 	 * The spec says, in case of std. mode the divider is
 	 * 2 whereas it is 3 for fast and fastplus mode of
@@ -911,20 +907,32 @@ static const struct i2c_algorithm nmk_i2c_algo = {
 	.functionality	= nmk_i2c_functionality
 };
 
+static struct nmk_i2c_controller u8500_i2c = {
+	/*
+	 * Slave data setup time; 250ns, 100ns, and 10ns, which
+	 * is 14, 6 and 2 respectively for a 48Mhz i2c clock.
+	 */
+	.slsu           = 0xe,
+	.tft            = 1,      /* Tx FIFO threshold */
+	.rft            = 8,      /* Rx FIFO threshold */
+	.clk_freq       = 400000, /* fast mode operation */
+	.timeout        = 200,    /* Slave response timeout(ms) */
+	.sm             = I2C_FREQ_MODE_FAST,
+};
+
 static atomic_t adapter_id = ATOMIC_INIT(0);
 
 static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	int ret = 0;
-	struct nmk_i2c_controller *pdata =
-			adev->dev.platform_data;
+	struct nmk_i2c_controller *pdata = adev->dev.platform_data;
 	struct nmk_i2c_dev	*dev;
 	struct i2c_adapter *adap;
 
-	if (!pdata) {
-		dev_warn(&adev->dev, "no platform data\n");
-		return -ENODEV;
-	}
+	if (!pdata)
+		/* No i2c configuration found, using the default. */
+		pdata = &u8500_i2c;
+
 	dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL);
 	if (!dev) {
 		dev_err(&adev->dev, "cannot allocate memory\n");