PCI: brcmstb: Make two changes in MDIO register fields

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The hardware has been updated with two changes to the MDIO packet
format.

The CMD field used to be 12 bits and now is only 1 bit. This change
is backwards compatible because the field's starting bit position is
unchanged, and the only commands we've used have values 0 and 1.

The PORT field's width has been changed from 4 bits to 5 bits. When
written, the new bit is not contiguous with the other four. However,
this change is backwards compatible because the driver never used
anything other than 0 for the port field's value.

Thus, update the existing code to handle new changes to the hardware
in a backwards-compatible manner.

Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20250214173944.47506-8-james.quinlan@broadcom.com
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

...

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Jim Quinlan 2025-02-14 12:39:35 -05:00 • committed by Krzysztof Wilczyński

parent 42fd45be82

commit a9ec9fb738

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drivers/pci/controller/pcie-brcmstb.c

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