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SubjectRe: [PATCH 3/3] phy: mscc: Add support for VSC8531_02 with RGMII tuning
Date
On 29.06.2021 11:40, Harini Katakam wrote:
> Add support for VSC8531_02 (Rev 2) device.
> Add support for optional RGMII RX and TX delay tuning via devicetree.
> The hierarchy is:
> - Retain the defaul 0.2ns delay when RGMII tuning is not set.
> - Retain the default 2ns delay when RGMII tuning is set and DT delay
> property is NOT specified.
> - Use the DT delay value when RGMII tuning is set and a DT delay
> property is specified.
>
> Signed-off-by: Harini Katakam <harini.katakam@xilinx.com>
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> ---
> drivers/net/phy/mscc/mscc.h | 3 +++
> drivers/net/phy/mscc/mscc_main.c | 41 ++++++++++++++++++++++++++++++--
> 2 files changed, 42 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/phy/mscc/mscc.h b/drivers/net/phy/mscc/mscc.h
> index a50235fdf7d9..5a26eba0ace0 100644
> --- a/drivers/net/phy/mscc/mscc.h
> +++ b/drivers/net/phy/mscc/mscc.h
> @@ -281,6 +281,7 @@ enum rgmii_clock_delay {
> #define PHY_ID_VSC8514 0x00070670
> #define PHY_ID_VSC8530 0x00070560
> #define PHY_ID_VSC8531 0x00070570
> +#define PHY_ID_VSC8531_02 0x00070572
> #define PHY_ID_VSC8540 0x00070760
> #define PHY_ID_VSC8541 0x00070770
> #define PHY_ID_VSC8552 0x000704e0
> @@ -373,6 +374,8 @@ struct vsc8531_private {
> * package.
> */
> unsigned int base_addr;
> + u32 rx_delay;
> + u32 tx_delay;
>
> #if IS_ENABLED(CONFIG_MACSEC)
> /* MACsec fields:
> diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_main.c
> index 6e32da28e138..2b501824c802 100644
> --- a/drivers/net/phy/mscc/mscc_main.c
> +++ b/drivers/net/phy/mscc/mscc_main.c
> @@ -535,15 +535,16 @@ static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
> u16 rgmii_tx_delay_pos = ffs(rgmii_tx_delay_mask) - 1;
> u16 reg_val = 0;
> int rc;
> + struct vsc8531_private *vsc8531 = phydev->priv;
>
> mutex_lock(&phydev->lock);
>
> if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
> phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
> - reg_val |= RGMII_CLK_DELAY_2_0_NS << rgmii_rx_delay_pos;
> + reg_val |= vsc8531->rx_delay << rgmii_rx_delay_pos;
> if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
> phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
> - reg_val |= RGMII_CLK_DELAY_2_0_NS << rgmii_tx_delay_pos;
> + reg_val |= vsc8531->tx_delay << rgmii_tx_delay_pos;
>
> rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2,
> rgmii_cntl,
> @@ -1820,6 +1821,17 @@ static int vsc85xx_config_init(struct phy_device *phydev)
> {
> int rc, i, phy_id;
> struct vsc8531_private *vsc8531 = phydev->priv;
> + struct device_node *of_node = phydev->mdio.dev.of_node;
> +
> + rc = of_property_read_u32(of_node, "vsc8531,rx-delay",
> + &vsc8531->rx_delay);
> + if (rc < 0)
> + vsc8531->rx_delay = RGMII_CLK_DELAY_2_0_NS;
> +
> + rc = of_property_read_u32(of_node, "vsc8531,tx-delay",
> + &vsc8531->tx_delay);
> + if (rc < 0)
> + vsc8531->tx_delay = RGMII_CLK_DELAY_2_0_NS;
>
> rc = vsc85xx_default_config(phydev);
> if (rc)
> @@ -2444,6 +2456,30 @@ static struct phy_driver vsc85xx_driver[] = {
> .get_strings = &vsc85xx_get_strings,
> .get_stats = &vsc85xx_get_stats,
> },
> +{
> + .phy_id = PHY_ID_VSC8531_02,
> + .name = "Microsemi VSC8531-02",
> + .phy_id_mask = 0xfffffff0,

VSC8531 and VSC8531-02 share the same model number, therefore you
would have to switch both PHY drivers to exact match.
phy_id_mask = 0xffffffff, or better use macro PHY_ID_MATCH_EXACT().


> + /* PHY_GBIT_FEATURES */
> + .soft_reset = &genphy_soft_reset,
> + .config_init = &vsc85xx_config_init,
> + .config_aneg = &vsc85xx_config_aneg,
> + .read_status = &vsc85xx_read_status,
> + .handle_interrupt = vsc85xx_handle_interrupt,
> + .config_intr = &vsc85xx_config_intr,
> + .suspend = &genphy_suspend,
> + .resume = &genphy_resume,
> + .probe = &vsc85xx_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_VSC8540,
> .name = "Microsemi FE VSC8540 SyncE",
> @@ -2668,6 +2704,7 @@ static struct mdio_device_id __maybe_unused vsc85xx_tbl[] = {
> { PHY_ID_VSC8514, 0xfffffff0, },
> { PHY_ID_VSC8530, 0xfffffff0, },
> { PHY_ID_VSC8531, 0xfffffff0, },
> + { PHY_ID_VSC8531_02, 0xfffffff0, },

Effectively this is the same as the line before. Maybe it would make sense
to change this table in a follow-up patch to just one entry covering all
PHY ID's with the vendor part being Microsemi, e.g. using macro
PHY_ID_MATCH_VENDOR().

> { PHY_ID_VSC8540, 0xfffffff0, },
> { PHY_ID_VSC8541, 0xfffffff0, },
> { PHY_ID_VSC8552, 0xfffffff0, },
>

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