rk3568 rt uboot init

hc

2023-11-06 9df731a176aab8e03b984b681b1bea01ccff6644

 u-boot/drivers/i2c/muxes/max96745.c
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@@ -13,11 +13,18 @@
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 struct max96745_priv {
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 	struct udevice *dev;
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 	struct gpio_desc enable_gpio;
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+	struct gpio_desc pwdnb_gpio;
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+	bool idle_disc;
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 };
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19
 
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 static int max96745_select(struct udevice *mux, struct udevice *bus,
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 			   uint channel)
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 {
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+	struct max96745_priv *priv = dev_get_priv(mux);
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+
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+	if (!priv->idle_disc)
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+		return 0;
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+
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 	if (channel == 1)
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 		dm_i2c_reg_clrset(mux, 0x0086, DIS_REM_CC,
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 				  FIELD_PREP(DIS_REM_CC, 0));
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@@ -31,6 +38,11 @@
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 static int max96745_deselect(struct udevice *mux, struct udevice *bus,
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 			     uint channel)
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 {
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+	struct max96745_priv *priv = dev_get_priv(mux);
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+
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+	if (!priv->idle_disc)
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+		return 0;
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+
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 	if (channel == 1)
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 		dm_i2c_reg_clrset(mux, 0x0086, DIS_REM_CC,
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 				  FIELD_PREP(DIS_REM_CC, 1));
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@@ -55,15 +67,27 @@
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 		mdelay(200);
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 	}
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69
 
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-	ret = dm_i2c_reg_clrset(priv->dev, 0x0076, DIS_REM_CC,
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-				FIELD_PREP(DIS_REM_CC, 1));
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+	if (dm_gpio_is_valid(&priv->pwdnb_gpio)) {
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+		dm_gpio_set_value(&priv->pwdnb_gpio, 0);
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+		mdelay(30);
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+	}
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+
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+	/* Set for I2C Fast-mode speed */
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+	ret = dm_i2c_reg_write(priv->dev, 0x0070, 0x16);
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 	if (ret < 0)
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 		return ret;
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79
 
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-	ret = dm_i2c_reg_clrset(priv->dev, 0x0086, DIS_REM_CC,
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-				FIELD_PREP(DIS_REM_CC, 1));
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-	if (ret < 0)
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-		return ret;
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+	if (priv->idle_disc) {
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+		ret = dm_i2c_reg_clrset(priv->dev, 0x0076, DIS_REM_CC,
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+					FIELD_PREP(DIS_REM_CC, 1));
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+		if (ret < 0)
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+			return ret;
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+
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+		ret = dm_i2c_reg_clrset(priv->dev, 0x0086, DIS_REM_CC,
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+					FIELD_PREP(DIS_REM_CC, 1));
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+		if (ret < 0)
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+			return ret;
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+	}
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91
 
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 	return 0;
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 }
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@@ -78,6 +102,7 @@
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 		return ret;
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 	priv->dev = dev;
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+	priv->idle_disc = dev_read_bool(dev, "i2c-mux-idle-disconnect");
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106
 
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 	ret = gpio_request_by_name(dev, "enable-gpios", 0,
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 				   &priv->enable_gpio, GPIOD_IS_OUT);
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@@ -86,6 +111,13 @@
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 		return ret;
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 	}
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113
 
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+	ret = gpio_request_by_name(dev, "pwdnb-gpios", 0,
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+				   &priv->pwdnb_gpio, GPIOD_IS_OUT);
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+	if (ret && ret != -ENOENT) {
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+		dev_err(dev, "%s: failed to get pwdnb GPIO: %d\n", __func__, ret);
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+		return ret;
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+	}
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+
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 	max96745_power_on(priv);
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 	return 0;