[v4,1/2] net: phy: mscc: add support for VSC8514 PHY

The VSC8514 PHY is a 4-ports PHY that is 10/100/1000BASE-T, 100BASE-FX,
1000BASE-X, can communicate with the MAC via QSGMII.
The MAC interface protocol for each port within QSGMII can
be either 1000BASE-X or SGMII, if the QSGMII MAC that the VSC8514 is
connecting to supports this functionality.
VSC8514 also supports SGMII MAC-side autonegotiation on each individual
port, downshifting, can set the blinking pattern of each of its 4 LEDs,
SyncE, 1000BASE-T Ring Resiliency as well as HP Auto-MDIX detection.

This adds support for 10BASE-T, 100BASE-TX, and 1000BASE-T,
QSGMII link with the MAC, downshifting, HP Auto-MDIX detection
and blinking pattern for its 4 LEDs.

The GPIO register bank is a set of registers that are common to all PHYs
in the package. So any modification in any register of this bank affects
all PHYs of the package.

If the PHYs haven't been reset before booting the Linux kernel and were
configured to use interrupts for e.g. link status updates, it is
required to clear the interrupts mask register of all PHYs before being
able to use interrupts with any PHY. The first PHY of the package that
will be init will take care of clearing all PHYs interrupts mask
registers. Thus, we need to keep track of the init sequence in the
package, if it's already been done or if it's to be done.

Most of the init sequence of a PHY of the package is common to all PHYs
in the package, thus we use the SMI broadcast feature which enables us
to propagate a write in one register of one PHY to all PHYs in the same
package.

Signed-off-by: Kavya Sree Kotagiri <kavyasree.kotagiri@microchip.com>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
Co-developed-by: Quentin Schulz <quentin.schulz@bootlin.com>
---

Changes in v4:
- Removed features and aneg_done settings.

Changes in v3:
- Used BIT(x) instead of hex values.
- Replaced magic numbers with constants.
- Handled delays and timeouts.
- Added comments where needed.

Changes in v2:
- Sorted variable declarations.

 drivers/net/phy/Kconfig |   2 +-
 drivers/net/phy/mscc.c  | 426 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 427 insertions(+), 1 deletion(-)

On 10.04.2019 13:32, Kavyasree.Kotagiri@microchip.com wrote:
> The VSC8514 PHY is a 4-ports PHY that is 10/100/1000BASE-T, 100BASE-FX,
> 1000BASE-X, can communicate with the MAC via QSGMII.
> The MAC interface protocol for each port within QSGMII can
> be either 1000BASE-X or SGMII, if the QSGMII MAC that the VSC8514 is
> connecting to supports this functionality.
> VSC8514 also supports SGMII MAC-side autonegotiation on each individual
> port, downshifting, can set the blinking pattern of each of its 4 LEDs,
> SyncE, 1000BASE-T Ring Resiliency as well as HP Auto-MDIX detection.
> 
> This adds support for 10BASE-T, 100BASE-TX, and 1000BASE-T,
> QSGMII link with the MAC, downshifting, HP Auto-MDIX detection
> and blinking pattern for its 4 LEDs.
> 
> The GPIO register bank is a set of registers that are common to all PHYs
> in the package. So any modification in any register of this bank affects
> all PHYs of the package.
> 
> If the PHYs haven't been reset before booting the Linux kernel and were
> configured to use interrupts for e.g. link status updates, it is
> required to clear the interrupts mask register of all PHYs before being
> able to use interrupts with any PHY. The first PHY of the package that
> will be init will take care of clearing all PHYs interrupts mask
> registers. Thus, we need to keep track of the init sequence in the
> package, if it's already been done or if it's to be done.
> 
> Most of the init sequence of a PHY of the package is common to all PHYs
> in the package, thus we use the SMI broadcast feature which enables us
> to propagate a write in one register of one PHY to all PHYs in the same
> package.
> 
> Signed-off-by: Kavya Sree Kotagiri <kavyasree.kotagiri@microchip.com>
> Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
> Co-developed-by: Quentin Schulz <quentin.schulz@bootlin.com>
> ---
> 
> Changes in v4:
> - Removed features and aneg_done settings.
> 
> Changes in v3:
> - Used BIT(x) instead of hex values.
> - Replaced magic numbers with constants.
> - Handled delays and timeouts.
> - Added comments where needed.
> 
> Changes in v2:
> - Sorted variable declarations.
> 
>  drivers/net/phy/Kconfig |   2 +-
>  drivers/net/phy/mscc.c  | 426 ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 427 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index 520657945b82..89085e87ecab 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -397,7 +397,7 @@ config MICROCHIP_T1_PHY
>  config MICROSEMI_PHY
>  	tristate "Microsemi PHYs"
>  	---help---
> -	  Currently supports VSC8530, VSC8531, VSC8540 and VSC8541 PHYs
> +	  Currently supports VSC8514, VSC8530, VSC8531, VSC8540 and VSC8541 PHYs
>  
>  config NATIONAL_PHY
>  	tristate "National Semiconductor PHYs"
> diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
> index db50efb30df5..43a13fc9183e 100644
> --- a/drivers/net/phy/mscc.c
> +++ b/drivers/net/phy/mscc.c
> @@ -85,12 +85,38 @@ enum rgmii_rx_clock_delay {
>  #define LED_MODE_SEL_MASK(x)		  (GENMASK(3, 0) << LED_MODE_SEL_POS(x))
>  #define LED_MODE_SEL(x, mode)		  (((mode) << LED_MODE_SEL_POS(x)) & LED_MODE_SEL_MASK(x))
>  
> +#define MSCC_EXT_PAGE_CSR_CNTL_17           17
> +#define MSCC_EXT_PAGE_CSR_CNTL_18           18
> +
> +#define MSCC_EXT_PAGE_CSR_CNTL_19           19
> +#define MSCC_PHY_CSR_CNTL_19_REG_ADDR(x)    (x)
> +#define MSCC_PHY_CSR_CNTL_19_TARGET(x)      ((x) << 12)
> +#define MSCC_PHY_CSR_CNTL_19_READ           BIT(14)
> +#define MSCC_PHY_CSR_CNTL_19_CMD            BIT(15)
> +
> +#define MSCC_EXT_PAGE_CSR_CNTL_20           20
> +#define MSCC_PHY_CSR_CNTL_20_TARGET(x)      (x)
> +
> +#define PHY_MCB_TARGET                    0x07
> +#define PHY_MCB_S6G_WRITE                 BIT(31)
> +#define PHY_MCB_S6G_READ                  BIT(30)
> +
> +#define PHY_S6G_SYS_RST_POS		  31
> +#define PHY_S6G_ENA_LANE_POS		  18
> +#define PHY_S6G_ENA_LOOP_POS		  8
> +#define PHY_S6G_QRATE_POS		  6
> +#define PHY_S6G_IF_MODE_POS		  4
> +#define PHY_S6G_PLL_ENA_OFFS_POS	  21
> +#define PHY_S6G_PLL_FSM_CTRL_DATA_POS	  8
> +#define PHY_S6G_PLL_FSM_ENA_POS		  7
> +
>  #define MSCC_EXT_PAGE_ACCESS		  31
>  #define MSCC_PHY_PAGE_STANDARD		  0x0000 /* Standard registers */
>  #define MSCC_PHY_PAGE_EXTENDED		  0x0001 /* Extended registers */
>  #define MSCC_PHY_PAGE_EXTENDED_2	  0x0002 /* Extended reg - page 2 */
>  #define MSCC_PHY_PAGE_EXTENDED_3	  0x0003 /* Extended reg - page 3 */
>  #define MSCC_PHY_PAGE_EXTENDED_4	  0x0004 /* Extended reg - page 4 */
> +#define MSCC_PHY_PAGE_CSR_CNTL		  MSCC_PHY_PAGE_EXTENDED_4
>  /* Extended reg - GPIO; this is a bank of registers that are shared for all PHYs
>   * in the same package.
>   */
> @@ -216,6 +242,7 @@ enum rgmii_rx_clock_delay {
>  #define MSCC_PHY_TR_MSB			  18
>  
>  /* Microsemi PHY ID's */
> +#define PHY_ID_VSC8514			  0x00070670
>  #define PHY_ID_VSC8530			  0x00070560
>  #define PHY_ID_VSC8531			  0x00070570
>  #define PHY_ID_VSC8540			  0x00070760
> @@ -1742,6 +1769,357 @@ static int vsc8584_did_interrupt(struct phy_device *phydev)
>  	return (rc < 0) ? 0 : rc & MII_VSC85XX_INT_MASK_MASK;
>  }
>  
> +static int vsc8514_config_pre_init(struct phy_device *phydev)
> +{
> +	/* These are the settings to override the silicon default
> +	 * values to handle hardware performance of PHY. They
> +	 * are set at Power-On state and remain until PHY Reset.
> +	 */
> +	const struct reg_val pre_init1[] = {
> +		{0x0f90, 0x00688980},
> +		{0x0786, 0x00000003},
> +		{0x07fa, 0x0050100f},
> +		{0x0f82, 0x0012b002},
> +		{0x1686, 0x00000004},
> +		{0x168c, 0x00d2c46f},
> +		{0x17a2, 0x00000620},
> +		{0x16a0, 0x00eeffdd},
> +		{0x16a6, 0x00071448},
> +		{0x16a4, 0x0013132f},
> +		{0x16a8, 0x00000000},
> +		{0x0ffc, 0x00c0a028},
> +		{0x0fe8, 0x0091b06c},
> +		{0x0fea, 0x00041600},
> +		{0x0f80, 0x00fffaff},
> +		{0x0fec, 0x00901809},
> +		{0x0ffe, 0x00b01007},
> +		{0x16b0, 0x00eeff00},
> +		{0x16b2, 0x00007000},
> +		{0x16b4, 0x00000814},
> +	};
> +	unsigned int i;
> +	u16 reg;
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_STANDARD);
> +
> +	/* all writes below are broadcasted to all PHYs in the same package */
> +	reg = phy_base_read(phydev, MSCC_PHY_EXT_CNTL_STATUS);
> +	reg |= SMI_BROADCAST_WR_EN;
> +	phy_base_write(phydev, MSCC_PHY_EXT_CNTL_STATUS, reg);
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_TEST);
> +
> +	reg = phy_base_read(phydev, MSCC_PHY_TEST_PAGE_8);
> +	reg |= BIT(15);
> +	phy_base_write(phydev, MSCC_PHY_TEST_PAGE_8, reg);
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_TR);
> +
> +	for (i = 0; i < ARRAY_SIZE(pre_init1); i++)
> +		vsc8584_csr_write(phydev, pre_init1[i].reg, pre_init1[i].val);
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_TEST);
> +
> +	reg = phy_base_read(phydev, MSCC_PHY_TEST_PAGE_8);
> +	reg &= ~BIT(15);
> +	phy_base_write(phydev, MSCC_PHY_TEST_PAGE_8, reg);
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_STANDARD);
> +
> +	reg = phy_base_read(phydev, MSCC_PHY_EXT_CNTL_STATUS);
> +	reg &= ~SMI_BROADCAST_WR_EN;
> +	phy_base_write(phydev, MSCC_PHY_EXT_CNTL_STATUS, reg);
> +
> +	return 0;
> +}
> +
> +static u32 vsc85xx_csr_ctrl_phy_read(struct phy_device *phydev,
> +				     u32 target, u32 reg)
> +{
> +	unsigned long deadline;
> +	u32 val, val_l, val_h;
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_CSR_CNTL);
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_CSR_CNTL_20,
> +		       MSCC_PHY_CSR_CNTL_20_TARGET(target >> 2));
> +
> +	if (target >> 2 == 0x1)

This target handling and shifting isn't really self-explaining.
A comment what is being done here would be good.
And can this 0x1 be replaced with a constant?

> +		/* non-MACsec access */
> +		target &= 0x3;
> +	else
> +		target = 0;
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_CSR_CNTL_19,
> +		       MSCC_PHY_CSR_CNTL_19_CMD | MSCC_PHY_CSR_CNTL_19_READ |
> +		       MSCC_PHY_CSR_CNTL_19_REG_ADDR(reg) |
> +		       MSCC_PHY_CSR_CNTL_19_TARGET(target));
> +
> +	deadline = jiffies + msecs_to_jiffies(PROC_CMD_NCOMPLETED_TIMEOUT_MS);
> +	do {
> +		usleep_range(500, 1000);
> +		val = phy_base_read(phydev, MSCC_EXT_PAGE_CSR_CNTL_19);
> +	} while (time_before(jiffies, deadline) &&
> +		!(val & MSCC_PHY_CSR_CNTL_19_CMD));
> +
> +	if (!(val & MSCC_PHY_CSR_CNTL_19_CMD))
> +		return -ETIMEDOUT;

The function returns u32. And all callers of this function don't check
for errors so far.

> +
> +	val_l = phy_base_read(phydev, MSCC_EXT_PAGE_CSR_CNTL_17);
> +	val_h = phy_base_read(phydev, MSCC_EXT_PAGE_CSR_CNTL_18);
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS,
> +		       MSCC_PHY_PAGE_STANDARD);
> +
> +	return (val_h << 16) | val_l;
> +}
> +
> +static int vsc85xx_csr_ctrl_phy_write(struct phy_device *phydev,
> +				      u32 target, u32 reg, u32 val)
> +{
> +	unsigned long deadline;
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_CSR_CNTL);
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_CSR_CNTL_20,
> +		       MSCC_PHY_CSR_CNTL_20_TARGET(target >> 2));
> +
> +	if ((target >> 2 == 0x1) || (target >> 2 == 0x3))

Same as in a previous comment: Can 0x1 and 0x3 be replaced with constants?

> +		target &= 0x3;
> +	else
> +		/* MACsec access */
> +		target = 0;
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_CSR_CNTL_17, (u16)val);
> +	phy_base_write(phydev, MSCC_EXT_PAGE_CSR_CNTL_18, (u16)(val >> 16));
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_CSR_CNTL_19,
> +		       MSCC_PHY_CSR_CNTL_19_CMD |
> +		       MSCC_PHY_CSR_CNTL_19_REG_ADDR(reg) |
> +		       MSCC_PHY_CSR_CNTL_19_TARGET(target));
> +	deadline = jiffies + msecs_to_jiffies(PROC_CMD_NCOMPLETED_TIMEOUT_MS);
> +	do {
> +		usleep_range(500, 1000);
> +		val = phy_base_read(phydev, MSCC_EXT_PAGE_CSR_CNTL_19);
> +	} while (time_before(jiffies, deadline) &&
> +		 !(val & MSCC_PHY_CSR_CNTL_19_CMD));
> +
> +	if (!(val & MSCC_PHY_CSR_CNTL_19_CMD))
> +		return -ETIMEDOUT;
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS,
> +		       MSCC_PHY_PAGE_STANDARD);
> +
> +	return 0;
> +}
> +
> +static int __phy_write_mcb_s6g(struct phy_device *phydev, u32 reg, u8 mcb,
> +			       u32 op)
> +{
> +	unsigned long deadline;
> +	u32 val;
> +	int ret;
> +
> +	ret = vsc85xx_csr_ctrl_phy_write(phydev, PHY_MCB_TARGET, reg,
> +					 op | (1 << mcb));
> +	if (ret)
> +		return -EINVAL;
> +
> +	deadline = jiffies + msecs_to_jiffies(PROC_CMD_NCOMPLETED_TIMEOUT_MS);
> +	do {
> +		usleep_range(500, 1000);
> +		val = vsc85xx_csr_ctrl_phy_read(phydev, PHY_MCB_TARGET, reg);
> +	} while (time_before(jiffies, deadline) && (val & op));
> +
> +	if (val & op)
> +		return -ETIMEDOUT;
> +
> +	return 0;
> +}
> +
> +/* Trigger a read to the spcified MCB */
> +static int phy_update_mcb_s6g(struct phy_device *phydev, u32 reg, u8 mcb)
> +{
> +	return __phy_write_mcb_s6g(phydev, reg, mcb, PHY_MCB_S6G_READ);
> +}
> +
> +/* Trigger a write to the spcified MCB */
> +static int phy_commit_mcb_s6g(struct phy_device *phydev, u32 reg, u8 mcb)
> +{
> +	return __phy_write_mcb_s6g(phydev, reg, mcb, PHY_MCB_S6G_WRITE);
> +}
> +
> +static int vsc8514_config_init(struct phy_device *phydev)
> +{
> +	struct vsc8531_private *vsc8531 = phydev->priv;
> +	unsigned long deadline;
> +	u16 val, addr;
> +	int ret, i;
> +	u32 reg;
> +
> +	phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
> +
> +	mutex_lock(&phydev->mdio.bus->mdio_lock);
> +
> +	__mdiobus_write(phydev->mdio.bus, phydev->mdio.addr,
> +			MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_EXTENDED);
> +	addr = __mdiobus_read(phydev->mdio.bus, phydev->mdio.addr,
> +			      MSCC_PHY_EXT_PHY_CNTL_4);

Instead of the __mdiobus functions you could use __phy_write and
__phy_read here.

> +	addr >>= PHY_CNTL_4_ADDR_POS;
> +
> +	val = __mdiobus_read(phydev->mdio.bus, phydev->mdio.addr,
> +			     MSCC_PHY_ACTIPHY_CNTL);
> +
Same here.

> +	if (val & PHY_ADDR_REVERSED)
> +		vsc8531->base_addr = phydev->mdio.addr + addr;
> +	else
> +		vsc8531->base_addr = phydev->mdio.addr - addr;
> +
> +	/* Some parts of the init sequence are identical for every PHY in the
> +	 * package. Some parts are modifying the GPIO register bank which is a
> +	 * set of registers that are affecting all PHYs, a few resetting the
> +	 * microprocessor common to all PHYs.
> +	 * All PHYs' interrupts mask register has to be zeroed before enabling
> +	 * any PHY's interrupt in this register.
> +	 * For all these reasons, we need to do the init sequence once and only
> +	 * once whatever is the first PHY in the package that is initialized and
> +	 * do the correct init sequence for all PHYs that are package-critical
> +	 * in this pre-init function.
> +	 */
> +	if (!vsc8584_is_pkg_init(phydev, val & PHY_ADDR_REVERSED ? 1 : 0)) {
> +		if ((phydev->phy_id & phydev->drv->phy_id_mask) ==
> +		    (PHY_ID_VSC8514 & phydev->drv->phy_id_mask))
> +			ret = vsc8514_config_pre_init(phydev);
> +		else
> +			ret = -EINVAL;
> +
> +		if (ret)
> +			goto err;
> +	}
> +
> +	vsc8531->pkg_init = true;
> +
> +	phy_base_write(phydev, MSCC_EXT_PAGE_ACCESS,
> +		       MSCC_PHY_PAGE_EXTENDED_GPIO);
> +
> +	val = phy_base_read(phydev, MSCC_PHY_MAC_CFG_FASTLINK);
> +
> +	val &= ~MAC_CFG_MASK;
> +	val |= MAC_CFG_QSGMII;
> +	ret = phy_base_write(phydev, MSCC_PHY_MAC_CFG_FASTLINK, val);
> +
> +	if (ret)
> +		goto err;
> +
> +	ret = vsc8584_cmd(phydev,
> +			  PROC_CMD_MCB_ACCESS_MAC_CONF |
> +			  PROC_CMD_RST_CONF_PORT |
> +			  PROC_CMD_READ_MOD_WRITE_PORT | PROC_CMD_QSGMII_MAC);
> +	if (ret)
> +		goto err;
> +
> +	/* 6g mcb */
> +	phy_update_mcb_s6g(phydev, 0x3f, 0);
> +	/* lcpll mcb */
> +	phy_update_mcb_s6g(phydev, 0x11, 0);
> +	/* pll5gcfg0 */
> +	ret = vsc85xx_csr_ctrl_phy_write(phydev, PHY_MCB_TARGET, 0x06,
> +					 0x7036f145);
> +	if (ret)
> +		goto err;
> +
> +	phy_commit_mcb_s6g(phydev, 0x11, 0);
> +	/* pllcfg */
> +	ret = vsc85xx_csr_ctrl_phy_write(phydev, PHY_MCB_TARGET, 0x2b,
> +					 (3 << PHY_S6G_PLL_ENA_OFFS_POS) |
> +					 (120 << PHY_S6G_PLL_FSM_CTRL_DATA_POS)
> +					 | (0 << PHY_S6G_PLL_FSM_ENA_POS));

Can a constant be used for the 0x2b? Same for the following calls.

> +	if (ret)
> +		goto err;
> +
> +	/* commoncfg */
> +	ret = vsc85xx_csr_ctrl_phy_write(phydev, PHY_MCB_TARGET, 0x2c,
> +					 (0 << PHY_S6G_SYS_RST_POS) |
> +					 (0 << PHY_S6G_ENA_LANE_POS) |
> +					 (0 << PHY_S6G_ENA_LOOP_POS) |
> +					 (0 << PHY_S6G_QRATE_POS) |
> +					 (3 << PHY_S6G_IF_MODE_POS));
> +	if (ret)
> +		goto err;
> +
> +	/* misccfg */
> +	ret = vsc85xx_csr_ctrl_phy_write(phydev, PHY_MCB_TARGET, 0x3b, 1);
> +	if (ret)
> +		goto err;
> +
> +	/* gpcfg */
> +	ret = vsc85xx_csr_ctrl_phy_write(phydev, PHY_MCB_TARGET, 0x2e, 768);
> +	if (ret)
> +		goto err;
> +
> +	phy_commit_mcb_s6g(phydev, 0x3e, 0);
> +
> +	deadline = jiffies + msecs_to_jiffies(PROC_CMD_NCOMPLETED_TIMEOUT_MS);
> +	do {
> +		usleep_range(500, 1000);
> +		phy_update_mcb_s6g(phydev, 0x3f, 0); /* read 6G MCB into CSRs */
> +		reg = vsc85xx_csr_ctrl_phy_read(phydev,
> +						PHY_MCB_TARGET, 0x31);
> +	} while (time_before(jiffies, deadline) && (reg & BIT(12)));
> +
> +	if (reg & BIT(12)) {
> +		mutex_unlock(&phydev->mdio.bus->mdio_lock);
> +		return -ETIMEDOUT;
> +	}
> +
> +	/* misccfg */
> +	ret = vsc85xx_csr_ctrl_phy_write(phydev, PHY_MCB_TARGET, 0x3b, 0);
> +	if (ret)
> +		goto err;
> +
> +	phy_commit_mcb_s6g(phydev, 0x3f, 0);
> +
> +	deadline = jiffies + msecs_to_jiffies(PROC_CMD_NCOMPLETED_TIMEOUT_MS);
> +	do {
> +		usleep_range(500, 1000);
> +		phy_update_mcb_s6g(phydev, 0x3f, 0); /* read 6G MCB into CSRs */
> +		reg = vsc85xx_csr_ctrl_phy_read(phydev,
> +						PHY_MCB_TARGET, 0x2f);
> +	} while (time_before(jiffies, deadline) && !(reg & BIT(8)));
> +
> +	if (!(reg & BIT(8))) {
> +		mutex_unlock(&phydev->mdio.bus->mdio_lock);
> +		return -ETIMEDOUT;
> +	}
> +
> +	mutex_unlock(&phydev->mdio.bus->mdio_lock);
> +
> +	phy_write(phydev, MSCC_EXT_PAGE_ACCESS,
> +		  MSCC_PHY_PAGE_STANDARD);
> +
> +	val = phy_read(phydev, MSCC_PHY_EXT_PHY_CNTL_1);
> +	val &= ~MEDIA_OP_MODE_MASK;
> +	val |= MEDIA_OP_MODE_COPPER;
> +	ret = phy_write(phydev, MSCC_PHY_EXT_PHY_CNTL_1, val);

You could use phy_modify here. And ret isn't checked but immediately
overwritten by the next call.

> +
> +	ret = genphy_soft_reset(phydev);
> +
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < vsc8531->nleds; i++) {
> +		ret = vsc85xx_led_cntl_set(phydev, i, vsc8531->leds_mode[i]);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return ret;
> +
> +err:
> +	mutex_unlock(&phydev->mdio.bus->mdio_lock);
> +	return ret;
> +}
> +
>  static int vsc85xx_ack_interrupt(struct phy_device *phydev)
>  {
>  	int rc = 0;
> @@ -1791,6 +2169,30 @@ static int vsc85xx_read_status(struct phy_device *phydev)
>  	return genphy_read_status(phydev);
>  }
>  
> +static int vsc8514_probe(struct phy_device *phydev)
> +{
> +	struct vsc8531_private *vsc8531;
> +	u32 default_mode[4] = {VSC8531_LINK_1000_ACTIVITY,
> +	   VSC8531_LINK_100_ACTIVITY, VSC8531_LINK_ACTIVITY,
> +	   VSC8531_DUPLEX_COLLISION};
> +
> +	vsc8531 = devm_kzalloc(&phydev->mdio.dev, sizeof(*vsc8531), GFP_KERNEL);
> +	if (!vsc8531)
> +		return -ENOMEM;
> +
> +	phydev->priv = vsc8531;
> +
> +	vsc8531->nleds = 4;
> +	vsc8531->supp_led_modes = VSC85XX_SUPP_LED_MODES;
> +	vsc8531->hw_stats = vsc85xx_hw_stats;
> +	vsc8531->nstats = ARRAY_SIZE(vsc85xx_hw_stats);
> +	vsc8531->stats = devm_kmalloc_array(&phydev->mdio.dev, vsc8531->nstats,
> +					    sizeof(u64), GFP_KERNEL);
> +	if (!vsc8531->stats)
> +		return -ENOMEM;

Typically an empty line is used before the return statement.

> +	return vsc85xx_dt_led_modes_get(phydev, default_mode);
> +}
> +
>  static int vsc8574_probe(struct phy_device *phydev)
>  {
>  	struct vsc8531_private *vsc8531;
> @@ -1878,6 +2280,29 @@ static int vsc85xx_probe(struct phy_device *phydev)
>  
>  /* Microsemi VSC85xx PHYs */
>  static struct phy_driver vsc85xx_driver[] = {
> +{
> +	.phy_id		= PHY_ID_VSC8514,
> +	.name		= "Microsemi GE VSC8514 SyncE",
> +	.phy_id_mask	= 0xfffffff0,
> +	.soft_reset	= &genphy_soft_reset,
> +	.config_init    = &vsc8514_config_init,
> +	.config_aneg    = &vsc85xx_config_aneg,
> +	.read_status	= &vsc85xx_read_status,
> +	.ack_interrupt  = &vsc85xx_ack_interrupt,
> +	.config_intr    = &vsc85xx_config_intr,
> +	.suspend	= &genphy_suspend,
> +	.resume		= &genphy_resume,
> +	.probe		= &vsc8514_probe,
> +	.set_wol	= &vsc85xx_wol_set,
> +	.get_wol	= &vsc85xx_wol_get,
> +	.get_tunable	= &vsc85xx_get_tunable,
> +	.set_tunable	= &vsc85xx_set_tunable,
> +	.read_page      = &vsc85xx_phy_read_page,
> +	.write_page     = &vsc85xx_phy_write_page,
> +	.get_sset_count = &vsc85xx_get_sset_count,
> +	.get_strings    = &vsc85xx_get_strings,
> +	.get_stats      = &vsc85xx_get_stats,
> +},
>  {
>  	.phy_id		= PHY_ID_VSC8530,
>  	.name		= "Microsemi FE VSC8530",
> @@ -2034,6 +2459,7 @@ static struct phy_driver vsc85xx_driver[] = {
>  module_phy_driver(vsc85xx_driver);
>  
>  static struct mdio_device_id __maybe_unused vsc85xx_tbl[] = {
> +	{ PHY_ID_VSC8514, 0xfffffff0, },
>  	{ PHY_ID_VSC8530, 0xfffffff0, },
>  	{ PHY_ID_VSC8531, 0xfffffff0, },
>  	{ PHY_ID_VSC8540, 0xfffffff0, },
>