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| author |   Peter Korsgaard <jacmet@sunsite.dk> | 2010-09-22 21:29:59 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2010-09-23 15:08:48 +0100 |
| commit | 1d5b4c0fa9ff79a4f01e5efc1caefd16b190a3dc (patch) | |
| tree | 3d6650d378615d829d0f89e15755a0c95228a7e3 /arch | |
| parent | Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/nico/orion (diff) | |
| download | linux-dev-1d5b4c0fa9ff79a4f01e5efc1caefd16b190a3dc.tar.xz linux-dev-1d5b4c0fa9ff79a4f01e5efc1caefd16b190a3dc.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-at91/at91sam9g45_devices.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c index 5e71ccd5e7d3..1276babf84d5 100644 --- 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 = { |