On Wed, Apr 26, 2023 at 04:13:13PM +0530, Harini Katakam wrote:
> From: Harini Katakam <harini.katakam@xxxxxxxxxx>
>
> 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@xxxxxxx>
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xxxxxxxxxx>
> Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx>
> ---
> v2:
> - Switch both VSC8531 and VSC8531-02 to use exact phy id match as they
> share the same model number
> - Ensure RCT
> - Improve optional property read
>
> drivers/net/phy/mscc/mscc.h | 3 +++
> drivers/net/phy/mscc/mscc_main.c | 40 ++++++++++++++++++++++++++++----
> 2 files changed, 39 insertions(+), 4 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 75d9582e5784..80cc90a23d57 100644
> --- a/drivers/net/phy/mscc/mscc_main.c
> +++ b/drivers/net/phy/mscc/mscc_main.c
> @@ -525,6 +525,7 @@ static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
> {
> u16 rgmii_rx_delay_pos = ffs(rgmii_rx_delay_mask) - 1;
> u16 rgmii_tx_delay_pos = ffs(rgmii_tx_delay_mask) - 1;
> + struct vsc8531_private *vsc8531 = phydev->priv;
> u16 reg_val = 0;
> int rc;
>
> @@ -532,10 +533,10 @@ static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
>
> 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,
> @@ -1812,6 +1813,15 @@ 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;
> +
> + vsc8531->rx_delay = RGMII_CLK_DELAY_2_0_NS;
> + rc = of_property_read_u32(of_node, "mscc,rx-delay",
> + &vsc8531->rx_delay);
> +
> + vsc8531->tx_delay = RGMII_CLK_DELAY_2_0_NS;
> + rc = of_property_read_u32(of_node, "mscc,tx-delay",
> + &vsc8531->tx_delay);
Since the dt-bindings document says "If this property is present then
the PHY applies the RX|TX delay", then I guess the precedence as applied
by vsc85xx_rgmii_set_skews() should be different. The RX delays should
be applied based on rx-internal-delay-ps (if present) regardless of
phy-mode, or set to RGMII_CLK_DELAY_2_0_NS if we are in the rgmii-rxid
or rgmii-id modes. Similar for tx.
Also, please split the VSC8531-02 addition into a separate patch, since
the configurable RGMII delays also affect existing PHYs (like VSC8502).
