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generic: rtl836x: support defered probe on mdio-bus

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On the WNDAP620, the mdio and mdc lines are controlled by
the EMAC ethernet device. This results in a hen-vs-egg problem.
The rtl8367b driver is probed before the ethernet driver and
the mdio-bus is not available yet, which caused the rtl8367b
driver to fail.

This patch changes the rtl8366_smi_probe_of() function to
return -EPROBE_DEFER if the mdio-bus lookup failed and changes
rtl8366_smi_probe()'s signature to return the error code back to
the callee, so it can propagate back to the kernel. Which, will
retry the switch probe at a later time.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Christian Lamparter
2018-10-17 22:37:36 +02:00
committed by John Crispin
parent fb4bed5fe9
commit 910c2f9e68
5 changed files with 17 additions and 13 deletions
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4
target/linux/generic/files/drivers/net/phy/rtl8366rb.c
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@@ -1445,8 +1445,8 @@ static int rtl8366rb_probe(struct platform_device *pdev)
" version " RTL8366RB_DRIVER_VER"\n");
smi = rtl8366_smi_probe(pdev);
if (!smi)
return -ENODEV;
if (IS_ERR(smi))
return PTR_ERR(smi);
smi->clk_delay = 10;
smi->cmd_read = 0xa9;