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i2c: designware_i2c: Add support for fast-plus speed 

Fast-plus runs at 1MHz and is used by some devices. Add support for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-01-23 11:48:23 -07:00 committed by Heiko Schocher
parent f3d461521a
commit d96440d1e3
2 changed files with 12 additions and 2 deletions
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12
drivers/i2c/designware_i2c.c
View File

@ -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;

2
drivers/i2c/designware_i2c.h
View File

@ -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