linux-kernel - [PATCH linux-master 1/3] can: tcan4x5x: Move clock init to TCAN driver

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Date:   Fri, 31 Jan 2020 12:34:31 -0600
From:   Dan Murphy <dmurphy@...com>
To:     <linux-kernel@...r.kernel.org>, <mkl@...gutronix.de>,
        <linux-can@...r.kernel.org>, <wg@...ndegger.com>,
        <sriram.dash@...sung.com>
CC:     <davem@...emloft.net>, Dan Murphy <dmurphy@...com>
Subject: [PATCH linux-master 1/3] can: tcan4x5x: Move clock init to TCAN driver

Move the clock discovery and initialization from the m_can framework to
the registrar.  This allows for registrars to have unique clock
initialization.  The TCAN device only needs the CAN clock reference.

Signed-off-by: Dan Murphy <dmurphy@...com>
---
 drivers/net/can/m_can/tcan4x5x.c | 78 ++++++++++++++++++++++++--------
 1 file changed, 59 insertions(+), 19 deletions(-)

diff --git a/drivers/net/can/m_can/tcan4x5x.c b/drivers/net/can/m_can/tcan4x5x.c
index eacd428e07e9..9821babef55e 100644
--- a/drivers/net/can/m_can/tcan4x5x.c
+++ b/drivers/net/can/m_can/tcan4x5x.c
@@ -124,6 +124,8 @@ struct tcan4x5x_priv {
 	struct gpio_desc *device_state_gpio;
 	struct regulator *power;
 
+	struct clk *cclk;
+
 	/* Register based ip */
 	int mram_start;
 	int reg_offset;
@@ -429,6 +431,27 @@ static struct m_can_ops tcan4x5x_ops = {
 	.clear_interrupts = tcan4x5x_clear_interrupts,
 };
 
+static int tcan4x5x_get_clock(struct tcan4x5x_priv *priv,
+			      struct m_can_classdev *m_can_dev)
+{
+	int freq;
+
+	priv->cclk = devm_clk_get(m_can_dev->dev, "cclk");
+	if (IS_ERR(priv->cclk)) {
+		dev_err(m_can_dev->dev, "no CAN clock source defined\n");
+		freq = TCAN4X5X_EXT_CLK_DEF;
+		priv->cclk = NULL;
+
+	} else {
+		freq = clk_get_rate(priv->cclk);
+		/* Sanity check */
+		if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF)
+			return -ERANGE;
+	}
+
+	return freq;
+}
+
 static int tcan4x5x_can_probe(struct spi_device *spi)
 {
 	struct tcan4x5x_priv *priv;
@@ -451,17 +474,9 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 
 	mcan_class->device_data = priv;
 
-	m_can_class_get_clocks(mcan_class);
-	if (IS_ERR(mcan_class->cclk)) {
-		dev_err(&spi->dev, "no CAN clock source defined\n");
-		freq = TCAN4X5X_EXT_CLK_DEF;
-	} else {
-		freq = clk_get_rate(mcan_class->cclk);
-	}
-
-	/* Sanity check */
-	if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF)
-		return -ERANGE;
+	freq = tcan4x5x_get_clock(priv, mcan_class);
+	if (freq < 0)
+		return freq;
 
 	priv->reg_offset = TCAN4X5X_MCAN_OFFSET;
 	priv->mram_start = TCAN4X5X_MRAM_START;
@@ -483,14 +498,14 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	spi->bits_per_word = 32;
 	ret = spi_setup(spi);
 	if (ret)
-		goto out_clk;
+		return ret;
 
 	priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus,
 					&spi->dev, &tcan4x5x_regmap);
 
 	ret = tcan4x5x_power_enable(priv->power, 1);
 	if (ret)
-		goto out_clk;
+		return ret;
 
 	ret = tcan4x5x_parse_config(mcan_class);
 	if (ret)
@@ -509,12 +524,6 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 
 out_power:
 	tcan4x5x_power_enable(priv->power, 0);
-out_clk:
-	if (!IS_ERR(mcan_class->cclk)) {
-		clk_disable_unprepare(mcan_class->cclk);
-		clk_disable_unprepare(mcan_class->hclk);
-	}
-
 	dev_err(&spi->dev, "Probe failed, err=%d\n", ret);
 	return ret;
 }
@@ -530,6 +539,37 @@ static int tcan4x5x_can_remove(struct spi_device *spi)
 	return 0;
 }
 
+static int __maybe_unused tcan4x5x_runtime_suspend(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct m_can_classdev *mcan_class = netdev_priv(ndev);
+	struct tcan4x5x_priv *priv = mcan_class->device_data;
+
+	m_can_class_suspend(dev);
+
+	if (priv->cclk)
+		clk_disable_unprepare(priv->cclk);
+
+	return 0;
+}
+
+static int __maybe_unused tcan4x5x_runtime_resume(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct m_can_classdev *mcan_class = netdev_priv(ndev);
+	struct tcan4x5x_priv *priv = mcan_class->device_data;
+
+	if (priv->cclk)
+		return clk_prepare_enable(priv->cclk);
+
+	return 0;
+}
+
+static const struct dev_pm_ops m_can_pmops = {
+	SET_RUNTIME_PM_OPS(tcan4x5x_runtime_suspend,
+			   tcan4x5x_runtime_resume, NULL)
+};
+
 static const struct of_device_id tcan4x5x_of_match[] = {
 	{ .compatible = "ti,tcan4x5x", },
 	{ }
-- 
2.25.0