From 78c6551e169429f1168ba53a6d0274a76a58f480 Mon Sep 17 00:00:00 2001 From: Peter Korsgaard Date: Wed, 22 Sep 2010 11:26:14 +0200 Subject: [PATCH] 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 --- 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 5e71ccd..1276bab 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 = { -- 1.7.1