Work based on i2c-omap.c from linux kernel.
fsscll/fssclh and hsscll/hssclh was always negative in high speed.
i2c high speed frequency start after 400Khz.
Signed-off-by: Christophe Ricard <christophe-h.ric...@st.com>
---
drivers/i2c/omap24xx_i2c.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
index 48ca446..774edaf 100644
--- a/drivers/i2c/omap24xx_i2c.c
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -129,7 +129,9 @@ static int omap24_i2c_setspeed(struct udevice *adap,
unsigned int speed)
i2c_base = i2c_bus->i2c_base;
#endif
- if (speed >= OMAP_I2C_HIGH_SPEED) {
+ if (speed > 400000) {
+ unsigned long scl;
+
/* High speed */
psc = I2C_IP_CLK / I2C_INTERNAL_SAMPLING_CLK;
psc -= 1;
@@ -139,12 +141,11 @@ static int omap24_i2c_setspeed(struct udevice *adap,
unsigned int speed)
}
/* For first phase of HS mode */
- fsscll = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
+ scl = I2C_INTERNAL_SAMPLING_CLK / 400000;
- fssclh = fsscll;
+ fsscll = scl - (scl / 3) - 7;
+ fssclh = (scl / 3) - 5;
- fsscll -= I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM;
- fssclh -= I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM;
if (((fsscll < 0) || (fssclh < 0)) ||
((fsscll > 255) || (fssclh > 255))) {
puts("Error : I2C initializing first phase clock\n");
@@ -152,10 +153,10 @@ static int omap24_i2c_setspeed(struct udevice *adap,
unsigned int speed)
}
/* For second phase of HS mode */
- hsscll = hssclh = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
+ scl = I2C_IP_CLK / speed;
+ hsscll = scl - (scl / 3) - 7;
+ hssclh = (scl / 3) - 5;
- hsscll -= I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM;
- hssclh -= I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM;
if (((fsscll < 0) || (fssclh < 0)) ||
((fsscll > 255) || (fssclh > 255))) {
puts("Error : I2C initializing second phase clock\n");
--
2.5.0
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