Fast-plus runs at 1MHz and is used by some devices. Add support for this.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v3: - Add new patch with support for fast-plus speed
Changes in v2: None
drivers/i2c/designware_i2c.c | 12 ++++++++++-- drivers/i2c/designware_i2c.h | 2 ++ 2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index 1f41e3eae0..d9e0d81ff0 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -116,6 +116,13 @@ static const struct i2c_mode_info info_for_mode[] = { 300, 300, }, + [IC_SPEED_MODE_FAST_PLUS] = { + I2C_SPEED_FAST_PLUS_RATE, + MIN_FP_SCL_HIGHTIME, + MIN_FP_SCL_LOWTIME, + 260, + 500, + }, [IC_SPEED_MODE_HIGH] = { I2C_SPEED_HIGH_RATE, MIN_HS_SCL_HIGHTIME, @@ -230,6 +237,8 @@ static unsigned int __dw_i2c_set_bus_speed(struct dw_i2c *priv, (!scl_sda_cfg || scl_sda_cfg->has_high_speed)) i2c_spd = IC_SPEED_MODE_HIGH; else if (speed >= I2C_SPEED_FAST_RATE) + i2c_spd = IC_SPEED_MODE_FAST_PLUS; + else if (speed >= I2C_SPEED_FAST_PLUS_RATE) i2c_spd = IC_SPEED_MODE_FAST; else i2c_spd = IC_SPEED_MODE_STANDARD; @@ -271,13 +280,12 @@ static unsigned int __dw_i2c_set_bus_speed(struct dw_i2c *priv, writel(config.scl_hcnt, &i2c_base->ic_hs_scl_hcnt); writel(config.scl_lcnt, &i2c_base->ic_hs_scl_lcnt); break; - case IC_SPEED_MODE_STANDARD: cntl |= IC_CON_SPD_SS; writel(config.scl_hcnt, &i2c_base->ic_ss_scl_hcnt); writel(config.scl_lcnt, &i2c_base->ic_ss_scl_lcnt); break; - + case IC_SPEED_MODE_FAST_PLUS: case IC_SPEED_MODE_FAST: default: cntl |= IC_CON_SPD_FS; diff --git a/drivers/i2c/designware_i2c.h b/drivers/i2c/designware_i2c.h index 5289ab0683..3db63b5f95 100644 --- a/drivers/i2c/designware_i2c.h +++ b/drivers/i2c/designware_i2c.h @@ -68,6 +68,8 @@ struct i2c_regs { #define MIN_SS_SCL_LOWTIME 4700 #define MIN_FS_SCL_HIGHTIME 600 #define MIN_FS_SCL_LOWTIME 1300 +#define MIN_FP_SCL_HIGHTIME 260 +#define MIN_FP_SCL_LOWTIME 500 #define MIN_HS_SCL_HIGHTIME 60 #define MIN_HS_SCL_LOWTIME 160