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SubjectRe: [PATCH v3 1/8] dt-bindings: net: meson-dwmac: Add the amlogic,rx-delay-ns property
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On 5/24/2020 2:28 PM, Pavel Machek wrote:
> On Tue 2020-05-12 23:10:56, Martin Blumenstingl wrote:
>> The PRG_ETHERNET registers on Meson8b and newer SoCs can add an RX
>> delay. Add a property with the known supported values so it can be
>> configured according to the board layout.
>>
>> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
>> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
>> ---
>> .../bindings/net/amlogic,meson-dwmac.yaml | 13 +++++++++++++
>> 1 file changed, 13 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
>> index ae91aa9d8616..66074314e57a 100644
>> --- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
>> +++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
>> @@ -67,6 +67,19 @@ allOf:
>> PHY and MAC are adding a delay).
>> Any configuration is ignored when the phy-mode is set to "rmii".
>>
>> + amlogic,rx-delay-ns:
>> + enum:
>
> Is it likely other MACs will need rx-delay property, too? Should we get rid of the amlogic,
> prefix?

Yes, there are several MAC bindings that already define a delay property:

Documentation/devicetree/bindings/net/allwinner,sun8i-a83t-emac.yaml:
allwinner,rx-delay-ps:
Documentation/devicetree/bindings/net/allwinner,sun8i-a83t-emac.yaml:
allwinner,rx-delay-ps:
Documentation/devicetree/bindings/net/apm-xgene-enet.txt:- rx-delay:
Delay value for RGMII bridge RX clock.
Documentation/devicetree/bindings/net/apm-xgene-enet.txt: rx-delay
= <2>;
Documentation/devicetree/bindings/net/cavium-pip.txt:- rx-delay: Delay
value for RGMII receive clock. Optional. Disabled if 0.
Documentation/devicetree/bindings/net/mediatek-dwmac.txt:-
mediatek,rx-delay-ps: RX clock delay macro value. Default is 0.
Documentation/devicetree/bindings/net/mediatek-dwmac.txt:
mediatek,rx-delay-ps = <1530>;

standardizing on rx-delay-ps and tx-delay-ps would make sense since that
is the lowest resolution and the property would be correctly named with
an unit in the name.
--
Florian

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