target/linux/bcm27xx/patches-6.1/950-0457-net-phy-BCM54210PE-does-not-support-PTP.patch

   1 From b7bdb564eb5b2d0672d0c49d8b6b4c14196f71ca Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Sat, 5 Nov 2022 11:46:08 +0000
   4 Subject: [PATCH] net: phy: BCM54210PE does not support PTP
   5
   6 BCM54213PE is an Ethernet PHY that supports PTP hardware timestamping.
   7 BCM54210PW ia another Ethernet PHY, but one without PTP support.
   8 Unfortunately the two PHYs return the same ID when queried, so some
   9 extra information is required to determine whether the PHY is PTP-
  10 capable.
  11
  12 There are two Raspberry Pi products that use these PHYs - Pi 4B and
  13 CM4 - and fortunately they use different PHY addresses, so use that as
  14 a differentiator. Choose to treat a PHY with the same ID but another
  15 address as a BCM54210PE, which seems more common.
  16
  17 See: https://github.com/raspberrypi/linux/issues/5104
  18
  19 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  20 ---
  21  drivers/net/phy/bcm-phy-ptp.c | 12 ++++++++++++
  22  1 file changed, 12 insertions(+)
  23
  24 --- a/drivers/net/phy/bcm-phy-ptp.c
  25 +++ b/drivers/net/phy/bcm-phy-ptp.c
  26 @@ -916,6 +916,18 @@ struct bcm_ptp_private *bcm_ptp_probe(st
  27         switch (BRCM_PHY_MODEL(phydev)) {
  28         case PHY_ID_BCM54210E:
  29                 break;
  30 +#ifdef PHY_ID_BCM54213PE
  31 +       case PHY_ID_BCM54213PE:
  32 +               switch (phydev->mdio.addr) {
  33 +               case 0: // CM4 - this is a BCM54210PE which supports PTP
  34 +                       break;
  35 +               case 1: //  4B - this is a BCM54213PE which doesn't
  36 +                       return NULL;
  37 +               default: // Unknown - assume it's BCM54210PE
  38 +                       break;
  39 +               }
  40 +               break;
  41 +#endif
  42         default:
  43                 return NULL;
  44         }