ARM: 6406/1: at91sam9g45: fix i2c bus speed

Use a correct udelay value to get bus speed around 100KHz. The udelay
value was most likely copied from the older devices, but the 9g45
is signicantly faster (400MHz, DDR, ..), so a udelay of 2 gives a
bus speed of around 190KHz, which is too fast for some devices.
A udelay value of 5 gives a bus speed of around 90KHz here.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c
index 5e71ccd..1276bab 100644 (file)
--- a/arch/arm/mach-at91/at91sam9g45_devices.c
+++ b/arch/arm/mach-at91/at91sam9g45_devices.c
@@ -426,7 +426,7 @@ static struct i2c_gpio_platform_data pdata_i2c0 = {
        .sda_is_open_drain      = 1,
        .scl_pin                = AT91_PIN_PA21,
        .scl_is_open_drain      = 1,
-       .udelay                 = 2,            /* ~100 kHz */
+       .udelay                 = 5,            /* ~100 kHz */
 };
 
 static struct platform_device at91sam9g45_twi0_device = {
@@ -440,7 +440,7 @@ static struct i2c_gpio_platform_data pdata_i2c1 = {
        .sda_is_open_drain      = 1,
        .scl_pin                = AT91_PIN_PB11,
        .scl_is_open_drain      = 1,
-       .udelay                 = 2,            /* ~100 kHz */
+       .udelay                 = 5,            /* ~100 kHz */
 };
 
 static struct platform_device at91sam9g45_twi1_device = {