net: phy: meson-gxl: reuse functionality of the SMSC 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
reuse SMSC PHY driver functionality in the meson-gxl PHY driver.

Tested with a G12A internal PHY. I don't have GXL test hw,
therefore I replace only the callbacks that are identical in
the SMSC PHY driver.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/Kconfig

@@ -70,6 +70,7 @@ config AMD_PHY
 config MESON_GXL_PHY
 	tristate "Amlogic Meson GXL Internal PHY"
 	depends on ARCH_MESON || COMPILE_TEST
+	select SMSC_PHY
 	help
 	  Currently has a driver for the Amlogic Meson GXL Internal PHY
 

drivers/net/phy/meson-gxl.c

@@ -13,6 +13,7 @@
 #include <linux/phy.h>
 #include <linux/netdevice.h>
 #include <linux/bitfield.h>
+#include <linux/smscphy.h>
 
 #define TSTCNTL		20
 #define  TSTCNTL_READ		BIT(15)
@@ -23,18 +24,6 @@
 #define  TSTCNTL_WRITE_ADDRESS	GENMASK(4, 0)
 #define TSTREAD1	21
 #define TSTWRITE	23
-#define INTSRC_FLAG	29
-#define  INTSRC_ANEG_PR		BIT(1)
-#define  INTSRC_PARALLEL_FAULT	BIT(2)
-#define  INTSRC_ANEG_LP_ACK	BIT(3)
-#define  INTSRC_LINK_DOWN	BIT(4)
-#define  INTSRC_REMOTE_FAULT	BIT(5)
-#define  INTSRC_ANEG_COMPLETE	BIT(6)
-#define  INTSRC_ENERGY_DETECT	BIT(7)
-#define INTSRC_MASK	30
-
-#define INT_SOURCES (INTSRC_LINK_DOWN | INTSRC_ANEG_COMPLETE | \
-		     INTSRC_ENERGY_DETECT)
 
 #define BANK_ANALOG_DSP		0
 #define BANK_WOL		1
@@ -195,59 +184,6 @@ static int meson_gxl_read_status(struct phy_device *phydev)
 	return genphy_read_status(phydev);
 }
 
-static int meson_gxl_ack_interrupt(struct phy_device *phydev)
-{
-	int ret = phy_read(phydev, INTSRC_FLAG);
-
-	return ret < 0 ? ret : 0;
-}
-
-static int meson_gxl_config_intr(struct phy_device *phydev)
-{
-	int ret;
-
-	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
-		/* Ack any pending IRQ */
-		ret = meson_gxl_ack_interrupt(phydev);
-		if (ret)
-			return ret;
-
-		ret = phy_write(phydev, INTSRC_MASK, INT_SOURCES);
-	} else {
-		ret = phy_write(phydev, INTSRC_MASK, 0);
-
-		/* Ack any pending IRQ */
-		ret = meson_gxl_ack_interrupt(phydev);
-	}
-
-	return ret;
-}
-
-static irqreturn_t meson_gxl_handle_interrupt(struct phy_device *phydev)
-{
-	int irq_status;
-
-	irq_status = phy_read(phydev, INTSRC_FLAG);
-	if (irq_status < 0) {
-		phy_error(phydev);
-		return IRQ_NONE;
-	}
-
-	irq_status &= INT_SOURCES;
-
-	if (irq_status == 0)
-		return IRQ_NONE;
-
-	/* Aneg-complete interrupt is used for link-up detection */
-	if (phydev->autoneg == AUTONEG_ENABLE &&
-	    irq_status == INTSRC_ENERGY_DETECT)
-		return IRQ_HANDLED;
-
-	phy_trigger_machine(phydev);
-
-	return IRQ_HANDLED;
-}
-
 static struct phy_driver meson_gxl_phy[] = {
 	{
 		PHY_ID_MATCH_EXACT(0x01814400),
@@ -257,8 +193,8 @@ static struct phy_driver meson_gxl_phy[] = {
 		.soft_reset     = genphy_soft_reset,
 		.config_init	= meson_gxl_config_init,
 		.read_status	= meson_gxl_read_status,
-		.config_intr	= meson_gxl_config_intr,
-		.handle_interrupt = meson_gxl_handle_interrupt,
+		.config_intr	= smsc_phy_config_intr,
+		.handle_interrupt = smsc_phy_handle_interrupt,
 		.suspend        = genphy_suspend,
 		.resume         = genphy_resume,
 		.read_mmd	= genphy_read_mmd_unsupported,
@@ -268,9 +204,12 @@ static struct phy_driver meson_gxl_phy[] = {
 		.name		= "Meson G12A Internal PHY",
 		/* PHY_BASIC_FEATURES */
 		.flags		= PHY_IS_INTERNAL,
+		.probe		= smsc_phy_probe,
+		.config_init	= smsc_phy_config_init,
 		.soft_reset     = genphy_soft_reset,
-		.config_intr	= meson_gxl_config_intr,
-		.handle_interrupt = meson_gxl_handle_interrupt,
+		.read_status	= lan87xx_read_status,
+		.config_intr	= smsc_phy_config_intr,
+		.handle_interrupt = smsc_phy_handle_interrupt,
 		.suspend        = genphy_suspend,
 		.resume         = genphy_resume,
 		.read_mmd	= genphy_read_mmd_unsupported,