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net: macb: timer adjust mode is not supported

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The ptp portion of this driver controls the tsu's timer using the
controls for "increment mode", which is not compatible with the hardware
trying to control it via the gem_tsu_inc_ctrl and gem_tsu_ms inputs in
"timer adjust mode". Abort probe if the property signalling that the
relevant signals have been wired up is present.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260325-facebook-chop-cf792c53f1da@spud
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Conor Dooley 2026-03-25 16:28:15 +00:00 committed by Jakub Kicinski
parent 09a6164a4f
commit 41adda8764
1 changed files with 7 additions and 0 deletions
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7
drivers/net/ethernet/cadence/macb_main.c
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@ -5838,6 +5838,13 @@ static int macb_probe(struct platform_device *pdev)
bp->usrio = macb_config->usrio;
if (of_property_read_bool(bp->pdev->dev.of_node, "cdns,timer-adjust") &&
IS_ENABLED(CONFIG_MACB_USE_HWSTAMP)) {
dev_err(&pdev->dev, "Timer adjust mode is not supported\n");
err = -EINVAL;
goto err_out_free_netdev;
}
/* By default we set to partial store and forward mode for zynqmp.
* Disable if not set in devicetree.
*/