From: Simon Glass <sjg@chromium.org>
Date: Thu, 23 Jan 2020 18:48:23 +0000 (-0700)
Subject: i2c: designware_i2c: Add support for fast-plus speed
X-Git-Tag: v2020.04-rc2~24^2~3
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=d96440d1e36e080ca1229dab65bc417640b58df5;p=oweals%2Fu-boot.git

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>
---

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