diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/lpc32xx_i2c.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/i2c/lpc32xx_i2c.c b/drivers/i2c/lpc32xx_i2c.c index e63260c..47163cc 100644 --- a/drivers/i2c/lpc32xx_i2c.c +++ b/drivers/i2c/lpc32xx_i2c.c @@ -69,20 +69,20 @@ static unsigned int lpc32xx_i2c_set_bus_speed(struct i2c_adapter *adap, unsigned int speed) { int half_period; - int clk_rate; if (speed == 0) return -EINVAL; - if (adap->hwadapnr == 2) - /* OTG I2C clock source is different. */ - clk_rate = get_periph_clk_rate(); - else - clk_rate = get_hclk_clk_rate(); - half_period = (clk_rate / speed) / 2; - - if ((half_period > 255) || (half_period < 0)) - return -EINVAL; + /* OTG I2C clock source and CLK registers are different */ + if (adap->hwadapnr == 2) { + half_period = (get_periph_clk_rate() / speed) / 2; + if (half_period > 0xFF) + return -EINVAL; + } else { + half_period = (get_hclk_clk_rate() / speed) / 2; + if (half_period > 0x3FF) + return -EINVAL; + } writel(half_period, &lpc32xx_i2c[adap->hwadapnr]->clk_hi); writel(half_period, &lpc32xx_i2c[adap->hwadapnr]->clk_lo); @@ -97,7 +97,7 @@ static void _i2c_init(struct i2c_adapter *adap, /* soft reset (auto-clears) */ writel(LPC32XX_I2C_SOFT_RESET, &i2c->ctrl); - /* set HI and LO periods for about 350 kHz */ + /* set HI and LO periods for half of the default speed */ lpc32xx_i2c_set_bus_speed(adap, requested_speed); } |