netdev - [PATCH net-next 3/3] net: phy: bcm7xxx: request and manage GPHY clock

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Message-Id: <20200903043947.3272453-4-f.fainelli@gmail.com>
Date:   Wed,  2 Sep 2020 21:39:47 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>, andrew@...n.ch,
        adam.rudzinski@....net.pl, m.felsch@...gutronix.de,
        hkallweit1@...il.com, richard.leitner@...data.com,
        zhengdejin5@...il.com, devicetree@...r.kernel.org,
        kernel@...gutronix.de, kuba@...nel.org, robh+dt@...nel.org
Subject: [PATCH net-next 3/3] net: phy: bcm7xxx: request and manage GPHY clock

The internal Gigabit PHY on Broadcom STB chips has a digital clock which
drives its MDIO interface among other things, the driver now requests
and manage that clock during .probe() and .remove() accordingly.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/phy/bcm7xxx.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index 692048d86ab1..f0ffcdcaef03 100644
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -11,6 +11,7 @@
 #include "bcm-phy-lib.h"
 #include <linux/bitops.h>
 #include <linux/brcmphy.h>
+#include <linux/clk.h>
 #include <linux/mdio.h>
 
 /* Broadcom BCM7xxx internal PHY registers */
@@ -39,6 +40,7 @@
 
 struct bcm7xxx_phy_priv {
 	u64	*stats;
+	struct clk *clk;
 };
 
 static int bcm7xxx_28nm_d0_afe_config_init(struct phy_device *phydev)
@@ -534,7 +536,19 @@ static int bcm7xxx_28nm_probe(struct phy_device *phydev)
 	if (!priv->stats)
 		return -ENOMEM;
 
-	return 0;
+	priv->clk = devm_clk_get_optional(&phydev->mdio.dev, NULL);
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);
+
+	return clk_prepare_enable(priv->clk);
+}
+
+static void bcm7xxx_28nm_remove(struct phy_device *phydev)
+{
+	struct bcm7xxx_phy_priv *priv = phydev->priv;
+
+	clk_disable_unprepare(priv->clk);
+	devm_clk_put(&phydev->mdio.dev, priv->clk);
 }
 
 #define BCM7XXX_28NM_GPHY(_oui, _name)					\
@@ -552,6 +566,7 @@ static int bcm7xxx_28nm_probe(struct phy_device *phydev)
 	.get_strings	= bcm_phy_get_strings,				\
 	.get_stats	= bcm7xxx_28nm_get_phy_stats,			\
 	.probe		= bcm7xxx_28nm_probe,				\
+	.remove		= bcm7xxx_28nm_remove,				\
 }
 
 #define BCM7XXX_28NM_EPHY(_oui, _name)					\
@@ -567,6 +582,7 @@ static int bcm7xxx_28nm_probe(struct phy_device *phydev)
 	.get_strings	= bcm_phy_get_strings,				\
 	.get_stats	= bcm7xxx_28nm_get_phy_stats,			\
 	.probe		= bcm7xxx_28nm_probe,				\
+	.remove		= bcm7xxx_28nm_remove,				\
 }
 
 #define BCM7XXX_40NM_EPHY(_oui, _name)					\
-- 
2.25.1