[PATCH v4 5/6] dt-bindings: net: dsa: make reset optional and add rgmii-mode to mt7531

[Rob Herring]

On Fri, 10 Jun 2022 19:05:40 +0200, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w at public-files.de>
> 
> A board may have no independent reset-line, so reset cannot be used
> inside switch driver.
> 
> E.g. on Bananapi-R2 Pro switch and gmac are connected to same reset-line.
> 
> Resets should be acquired only to 1 device/driver. This prevents reset to
> be bound to switch-driver if reset is already used for gmac. If reset is
> only used by switch driver it resets the switch *and* the gmac after the
> mdio bus comes up resulting in mdio bus goes down. It takes some time
> until all is up again, switch driver tries to read from mdio, will fail
> and defer the probe. On next try the reset does the same again.
> 
> Make reset optional for such boards.
> 
> Allow port 5 as cpu-port and phy-mode rgmii for mt7531.
> 
> - MT7530 supports RGMII on port 5 and RGMII/TRGMII on port 6.
> - MT7531 supports on port 5 RGMII and SGMII (dual-sgmii) and
>   SGMII on port 6.
> 
> Signed-off-by: Frank Wunderlich <frank-w at public-files.de>
> ---
> v4:
>  - add port 5 as CPU-Port
>  - change description
> ---
>  .../devicetree/bindings/net/dsa/mediatek,mt7530.yaml      | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 

Reviewed-by: Rob Herring <robh at kernel.org>