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44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
From 913dc02ad0c59c2148db939f14db6b79f921bdf5 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Sat, 5 Nov 2022 11:46:08 +0000
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Subject: [PATCH] net: phy: BCM54210PE does not support PTP
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BCM54213PE is an Ethernet PHY that supports PTP hardware timestamping.
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BCM54210PW ia another Ethernet PHY, but one without PTP support.
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Unfortunately the two PHYs return the same ID when queried, so some
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extra information is required to determine whether the PHY is PTP-
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capable.
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There are two Raspberry Pi products that use these PHYs - Pi 4B and
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CM4 - and fortunately they use different PHY addresses, so use that as
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a differentiator. Choose to treat a PHY with the same ID but another
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address as a BCM54210PE, which seems more common.
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See: https://github.com/raspberrypi/linux/issues/5104
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/net/phy/bcm-phy-ptp.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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--- a/drivers/net/phy/bcm-phy-ptp.c
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+++ b/drivers/net/phy/bcm-phy-ptp.c
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@@ -916,6 +916,18 @@ struct bcm_ptp_private *bcm_ptp_probe(st
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switch (BRCM_PHY_MODEL(phydev)) {
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case PHY_ID_BCM54210E:
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break;
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+#ifdef PHY_ID_BCM54213PE
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+ case PHY_ID_BCM54213PE:
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+ switch (phydev->mdio.addr) {
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+ case 0: // CM4 - this is a BCM54210PE which supports PTP
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+ break;
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+ case 1: // 4B - this is a BCM54213PE which doesn't
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+ return NULL;
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+ default: // Unknown - assume it's BCM54210PE
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+ break;
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+ }
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+ break;
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+#endif
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default:
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return NULL;
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}
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