netdev - [PATCH net-next 1/2] net: phy: smsc: export functions for use by meson-gxl PHY driver

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Date:   Sat, 18 Mar 2023 21:32:41 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Chris Healy <cphealy@...il.com>
Subject: [PATCH net-next 1/2] net: phy: smsc: export functions for use by
 meson-gxl PHY driver

The Amlogic Meson internal PHY's have the same register layout as
certain SMSC PHY's (also for non-c22-standard registers). This seems
to be more than just coincidence. Apparently they also need the same
workaround for EDPD mode (energy detect power down). Therefore let's
export SMSC PHY driver functionality for use by the meson-gxl PHY
driver.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/smsc.c  | 20 +++++++++++++-------
 include/linux/smscphy.h |  6 ++++++
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index 721871184..730964b85 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -54,7 +54,7 @@ static int smsc_phy_ack_interrupt(struct phy_device *phydev)
 	return rc < 0 ? rc : 0;
 }
 
-static int smsc_phy_config_intr(struct phy_device *phydev)
+int smsc_phy_config_intr(struct phy_device *phydev)
 {
 	int rc;
 
@@ -75,8 +75,9 @@ static int smsc_phy_config_intr(struct phy_device *phydev)
 
 	return rc < 0 ? rc : 0;
 }
+EXPORT_SYMBOL_GPL(smsc_phy_config_intr);
 
-static irqreturn_t smsc_phy_handle_interrupt(struct phy_device *phydev)
+irqreturn_t smsc_phy_handle_interrupt(struct phy_device *phydev)
 {
 	int irq_status;
 
@@ -95,18 +96,20 @@ static irqreturn_t smsc_phy_handle_interrupt(struct phy_device *phydev)
 
 	return IRQ_HANDLED;
 }
+EXPORT_SYMBOL_GPL(smsc_phy_handle_interrupt);
 
-static int smsc_phy_config_init(struct phy_device *phydev)
+int smsc_phy_config_init(struct phy_device *phydev)
 {
 	struct smsc_phy_priv *priv = phydev->priv;
 
-	if (!priv->energy_enable || phydev->irq != PHY_POLL)
+	if (!priv || !priv->energy_enable || phydev->irq != PHY_POLL)
 		return 0;
 
 	/* Enable energy detect power down mode */
 	return phy_set_bits(phydev, MII_LAN83C185_CTRL_STATUS,
 			    MII_LAN83C185_EDPWRDOWN);
 }
+EXPORT_SYMBOL_GPL(smsc_phy_config_init);
 
 static int smsc_phy_reset(struct phy_device *phydev)
 {
@@ -186,7 +189,7 @@ static int lan95xx_config_aneg_ext(struct phy_device *phydev)
  * The workaround is only applicable to poll mode. Energy Detect Power-Down may
  * not be used in interrupt mode lest link change detection becomes unreliable.
  */
-static int lan87xx_read_status(struct phy_device *phydev)
+int lan87xx_read_status(struct phy_device *phydev)
 {
 	struct smsc_phy_priv *priv = phydev->priv;
 	int err;
@@ -195,7 +198,8 @@ static int lan87xx_read_status(struct phy_device *phydev)
 	if (err)
 		return err;
 
-	if (!phydev->link && priv->energy_enable && phydev->irq == PHY_POLL) {
+	if (!phydev->link && priv && priv->energy_enable &&
+	    phydev->irq == PHY_POLL) {
 		/* Disable EDPD to wake up PHY */
 		int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 		if (rc < 0)
@@ -229,6 +233,7 @@ static int lan87xx_read_status(struct phy_device *phydev)
 
 	return err;
 }
+EXPORT_SYMBOL_GPL(lan87xx_read_status);
 
 static int smsc_get_sset_count(struct phy_device *phydev)
 {
@@ -269,7 +274,7 @@ static void smsc_get_stats(struct phy_device *phydev,
 		data[i] = smsc_get_stat(phydev, i);
 }
 
-static int smsc_phy_probe(struct phy_device *phydev)
+int smsc_phy_probe(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->mdio.dev;
 	struct smsc_phy_priv *priv;
@@ -294,6 +299,7 @@ static int smsc_phy_probe(struct phy_device *phydev)
 
 	return clk_set_rate(refclk, 50 * 1000 * 1000);
 }
+EXPORT_SYMBOL_GPL(smsc_phy_probe);
 
 static struct phy_driver smsc_phy_driver[] = {
 {
diff --git a/include/linux/smscphy.h b/include/linux/smscphy.h
index 1a136271b..80f37c1db 100644
--- a/include/linux/smscphy.h
+++ b/include/linux/smscphy.h
@@ -28,4 +28,10 @@
 #define MII_LAN83C185_MODE_POWERDOWN 0xC0 /* Power Down mode */
 #define MII_LAN83C185_MODE_ALL       0xE0 /* All capable mode */
 
+int smsc_phy_config_intr(struct phy_device *phydev);
+irqreturn_t smsc_phy_handle_interrupt(struct phy_device *phydev);
+int smsc_phy_config_init(struct phy_device *phydev);
+int lan87xx_read_status(struct phy_device *phydev);
+int smsc_phy_probe(struct phy_device *phydev);
+
 #endif /* __LINUX_SMSCPHY_H__ */
-- 
2.39.2