[PATCH net-next v2 01/10] net: dsa: bcm_sf2: Convert using devm_clk_get_optional_enabled() in bcm_sf2_sw_probe()

[Li Zetao]

Use devm_clk_get_optional_enabled() instead of devm_clk_get_optional() +
clk_prepare_enable(), which can make the clk consistent with the device
life cycle and reduce the risk of unreleased clk resources. Since the
device framework has automatically released the clk resource, there is
no need to execute clk_disable_unprepare(clk) on the error path, drop
the out_clk_mdiv and out_clk labels, and the original error process can
be returned directly.

Acked-by: Florian Fainelli <florian.fainelli at broadcom.com>
Signed-off-by: Li Zetao <lizetao1 at huawei.com>
---
 drivers/net/dsa/bcm_sf2.c | 28 ++++++----------------------
 1 file changed, 6 insertions(+), 22 deletions(-)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 0e663ec0c12a..96c0fdb56601 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -1453,28 +1453,18 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 		base++;
 	}
 
-	priv->clk = devm_clk_get_optional(&pdev->dev, "sw_switch");
+	priv->clk = devm_clk_get_optional_enabled(&pdev->dev, "sw_switch");
 	if (IS_ERR(priv->clk))
 		return PTR_ERR(priv->clk);
 
-	ret = clk_prepare_enable(priv->clk);
-	if (ret)
-		return ret;
-
-	priv->clk_mdiv = devm_clk_get_optional(&pdev->dev, "sw_switch_mdiv");
-	if (IS_ERR(priv->clk_mdiv)) {
-		ret = PTR_ERR(priv->clk_mdiv);
-		goto out_clk;
-	}
-
-	ret = clk_prepare_enable(priv->clk_mdiv);
-	if (ret)
-		goto out_clk;
+	priv->clk_mdiv = devm_clk_get_optional_enabled(&pdev->dev, "sw_switch_mdiv");
+	if (IS_ERR(priv->clk_mdiv))
+		return PTR_ERR(priv->clk_mdiv);
 
 	ret = bcm_sf2_sw_rst(priv);
 	if (ret) {
 		pr_err("unable to software reset switch: %d\n", ret);
-		goto out_clk_mdiv;
+		return ret;
 	}
 
 	bcm_sf2_crossbar_setup(priv);
@@ -1484,7 +1474,7 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 	ret = bcm_sf2_mdio_register(ds);
 	if (ret) {
 		pr_err("failed to register MDIO bus\n");
-		goto out_clk_mdiv;
+		return ret;
 	}
 
 	bcm_sf2_gphy_enable_set(priv->dev->ds, false);
@@ -1551,10 +1541,6 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 
 out_mdio:
 	bcm_sf2_mdio_unregister(priv);
-out_clk_mdiv:
-	clk_disable_unprepare(priv->clk_mdiv);
-out_clk:
-	clk_disable_unprepare(priv->clk);
 	return ret;
 }
 
@@ -1571,8 +1557,6 @@ static void bcm_sf2_sw_remove(struct platform_device *pdev)
 	dsa_unregister_switch(priv->dev->ds);
 	bcm_sf2_cfp_exit(priv->dev->ds);
 	bcm_sf2_mdio_unregister(priv);
-	clk_disable_unprepare(priv->clk_mdiv);
-	clk_disable_unprepare(priv->clk);
 	if (priv->type == BCM7278_DEVICE_ID)
 		reset_control_assert(priv->rcdev);
 }
-- 
2.34.1