1 files changed, 48 insertions, 20 deletions

diff --git a/drivers/clk/clk-si5351.c b/drivers/clk/clk-si5351.c
index 20d90769cced..50e7c341e97e 100644
--- a/drivers/clk/clk-si5351.c
+++ b/drivers/clk/clk-si5351.c
@@ -72,7 +72,7 @@ static const char * const si5351_input_names[] = {
 	"xtal", "clkin"
 };
 static const char * const si5351_pll_names[] = {
-	"plla", "pllb", "vxco"
+	"si5351_plla", "si5351_pllb", "si5351_vxco"
 };
 static const char * const si5351_msynth_names[] = {
 	"ms0", "ms1", "ms2", "ms3", "ms4", "ms5", "ms6", "ms7"
@@ -903,13 +903,42 @@ static int _si5351_clkout_set_disable_state(
 	return 0;
 }
 
+static void _si5351_clkout_reset_pll(struct si5351_driver_data *drvdata, int num)
+{
+	u8 val = si5351_reg_read(drvdata, SI5351_CLK0_CTRL + num);
+
+	switch (val & SI5351_CLK_INPUT_MASK) {
+	case SI5351_CLK_INPUT_XTAL:
+	case SI5351_CLK_INPUT_CLKIN:
+		return;  /* pll not used, no need to reset */
+	}
+
+	si5351_reg_write(drvdata, SI5351_PLL_RESET,
+			 val & SI5351_CLK_PLL_SELECT ? SI5351_PLL_RESET_B :
+						       SI5351_PLL_RESET_A);
+
+	dev_dbg(&drvdata->client->dev, "%s - %s: pll = %d\n",
+		__func__, clk_hw_get_name(&drvdata->clkout[num].hw),
+		(val & SI5351_CLK_PLL_SELECT) ? 1 : 0);
+}
+
 static int si5351_clkout_prepare(struct clk_hw *hw)
 {
 	struct si5351_hw_data *hwdata =
 		container_of(hw, struct si5351_hw_data, hw);
+	struct si5351_platform_data *pdata =
+		hwdata->drvdata->client->dev.platform_data;
 
 	si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
 			SI5351_CLK_POWERDOWN, 0);
+
+	/*
+	 * Do a pll soft reset on the parent pll -- needed to get a
+	 * deterministic phase relationship between the output clocks.
+	 */
+	if (pdata->clkout[hwdata->num].pll_reset)
+		_si5351_clkout_reset_pll(hwdata->drvdata, hwdata->num);
+
 	si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
 			(1 << hwdata->num), 0);
 	return 0;
@@ -1297,6 +1326,9 @@ static int si5351_dt_parse(struct i2c_client *client,
 
 		pdata->clkout[num].pll_master =
 			of_property_read_bool(child, "silabs,pll-master");
+
+		pdata->clkout[num].pll_reset =
+			of_property_read_bool(child, "silabs,pll-reset");
 	}
 	client->dev.platform_data = pdata;
 
@@ -1437,11 +1469,6 @@ static int si5351_i2c_probe(struct i2c_client *client,
 		}
 	}
 
-	if (!IS_ERR(drvdata->pxtal))
-		clk_prepare_enable(drvdata->pxtal);
-	if (!IS_ERR(drvdata->pclkin))
-		clk_prepare_enable(drvdata->pclkin);
-
 	/* register xtal input clock gate */
 	memset(&init, 0, sizeof(init));
 	init.name = si5351_input_names[0];
@@ -1456,7 +1483,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 	ret = devm_clk_hw_register(&client->dev, &drvdata->xtal);
 	if (ret) {
 		dev_err(&client->dev, "unable to register %s\n", init.name);
-		goto err_clk;
+		return ret;
 	}
 
 	/* register clkin input clock gate */
@@ -1474,7 +1501,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 		if (ret) {
 			dev_err(&client->dev, "unable to register %s\n",
 				init.name);
-			goto err_clk;
+			return ret;
 		}
 	}
 
@@ -1496,7 +1523,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 	ret = devm_clk_hw_register(&client->dev, &drvdata->pll[0].hw);
 	if (ret) {
 		dev_err(&client->dev, "unable to register %s\n", init.name);
-		goto err_clk;
+		return ret;
 	}
 
 	/* register PLLB or VXCO (Si5351B) */
@@ -1520,7 +1547,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 	ret = devm_clk_hw_register(&client->dev, &drvdata->pll[1].hw);
 	if (ret) {
 		dev_err(&client->dev, "unable to register %s\n", init.name);
-		goto err_clk;
+		return ret;
 	}
 
 	/* register clk multisync and clk out divider */
@@ -1539,7 +1566,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 
 	if (WARN_ON(!drvdata->msynth || !drvdata->clkout)) {
 		ret = -ENOMEM;
-		goto err_clk;
+		return ret;
 	}
 
 	for (n = 0; n < num_clocks; n++) {
@@ -1559,7 +1586,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 		if (ret) {
 			dev_err(&client->dev, "unable to register %s\n",
 				init.name);
-			goto err_clk;
+			return ret;
 		}
 	}
 
@@ -1587,7 +1614,7 @@ static int si5351_i2c_probe(struct i2c_client *client,
 		if (ret) {
 			dev_err(&client->dev, "unable to register %s\n",
 				init.name);
-			goto err_clk;
+			return ret;
 		}
 
 		/* set initial clkout rate */
@@ -1606,17 +1633,17 @@ static int si5351_i2c_probe(struct i2c_client *client,
 				     drvdata);
 	if (ret) {
 		dev_err(&client->dev, "unable to add clk provider\n");
-		goto err_clk;
+		return ret;
 	}
 
 	return 0;
+}
 
-err_clk:
-	if (!IS_ERR(drvdata->pxtal))
-		clk_disable_unprepare(drvdata->pxtal);
-	if (!IS_ERR(drvdata->pclkin))
-		clk_disable_unprepare(drvdata->pclkin);
-	return ret;
+static int si5351_i2c_remove(struct i2c_client *client)
+{
+	of_clk_del_provider(client->dev.of_node);
+
+	return 0;
 }
 
 static const struct i2c_device_id si5351_i2c_ids[] = {
@@ -1634,6 +1661,7 @@ static struct i2c_driver si5351_driver = {
 		.of_match_table = of_match_ptr(si5351_dt_ids),
 	},
 	.probe = si5351_i2c_probe,
+	.remove = si5351_i2c_remove,
 	.id_table = si5351_i2c_ids,
 };
 module_i2c_driver(si5351_driver);