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

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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>
This commit is contained in:
Peter Korsgaard 2010-09-22 21:29:59 +01:00 committed by Russell King
parent 94bf275866
commit 1d5b4c0fa9
1 changed files with 2 additions and 2 deletions
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4
arch/arm/mach-at91/at91sam9g45_devices.c
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@ -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 = {