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authorPeter Korsgaard <jacmet@sunsite.dk>2010-09-22 16:29:59 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-09-23 10:08:48 -0400
commit1d5b4c0fa9ff79a4f01e5efc1caefd16b190a3dc (patch)
tree3d6650d378615d829d0f89e15755a0c95228a7e3 /arch/arm/mach-at91
parent94bf27586631d32ed08dd49eeaa77222b7874cf3 (diff)
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/arm/mach-at91')
-rw-r--r--arch/arm/mach-at91/at91sam9g45_devices.c4
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 5e71ccd5e7d..1276babf84d 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 = {
426 .sda_is_open_drain = 1, 426 .sda_is_open_drain = 1,
427 .scl_pin = AT91_PIN_PA21, 427 .scl_pin = AT91_PIN_PA21,
428 .scl_is_open_drain = 1, 428 .scl_is_open_drain = 1,
429 .udelay = 2, /* ~100 kHz */ 429 .udelay = 5, /* ~100 kHz */
430}; 430};
431 431
432static struct platform_device at91sam9g45_twi0_device = { 432static struct platform_device at91sam9g45_twi0_device = {
@@ -440,7 +440,7 @@ static struct i2c_gpio_platform_data pdata_i2c1 = {
440 .sda_is_open_drain = 1, 440 .sda_is_open_drain = 1,
441 .scl_pin = AT91_PIN_PB11, 441 .scl_pin = AT91_PIN_PB11,
442 .scl_is_open_drain = 1, 442 .scl_is_open_drain = 1,
443 .udelay = 2, /* ~100 kHz */ 443 .udelay = 5, /* ~100 kHz */
444}; 444};
445 445
446static struct platform_device at91sam9g45_twi1_device = { 446static struct platform_device at91sam9g45_twi1_device = {