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Subject[PATCH RFC v1 1/4] dt-bindings: net: dwmac-meson: use picoseconds for the RGMII RX delay
Date
Amlogic Meson G12A, G12B and SM1 SoCs have a more advanced RGMII RX
delay register which allows picoseconds precision. Deprecate the old
"amlogic,rx-delay-ns" in favour of a new "amlogic,rgmii-rx-delay-ps"
property.

For older SoCs the only known supported values were 0ns and 2ns. The new
SoCs have 200ps precision and support RGMII RX delays between 0ps and
3000ps.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
.../bindings/net/amlogic,meson-dwmac.yaml | 52 ++++++++++++++++++-
1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
index 6b057b117aa0..bafde1194193 100644
--- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
@@ -74,18 +74,68 @@ allOf:
Any configuration is ignored when the phy-mode is set to "rmii".

amlogic,rx-delay-ns:
+ deprecated: true
enum:
- 0
- 2
default: 0
+ description:
+ The internal RGMII RX clock delay in nanoseconds. Deprecated, use
+ amlogic,rgmii-rx-delay-ps instead.
+
+ amlogic,rgmii-rx-delay-ps:
+ default: 0
description:
The internal RGMII RX clock delay (provided by this IP block) in
- nanoseconds. When phy-mode is set to "rgmii" then the RX delay
+ picoseconds. When phy-mode is set to "rgmii" then the RX delay
should be explicitly configured. When the phy-mode is set to
either "rgmii-id" or "rgmii-rxid" the RX clock delay is already
provided by the PHY. Any configuration is ignored when the
phy-mode is set to "rmii".

+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - amlogic,meson8b-dwmac
+ - amlogic,meson8m2-dwmac
+ - amlogic,meson-gxbb-dwmac
+ - amlogic,meson-axg-dwmac
+ then:
+ properties:
+ amlogic,rgmii-rx-delay-ps:
+ enum:
+ - 0
+ - 2000
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - amlogic,meson-g12a-dwmac
+ then:
+ properties:
+ amlogic,rgmii-rx-delay-ps:
+ enum:
+ - 0
+ - 200
+ - 400
+ - 600
+ - 800
+ - 1000
+ - 1200
+ - 1400
+ - 1600
+ - 1800
+ - 2000
+ - 2200
+ - 2400
+ - 2600
+ - 2800
+ - 3000
+
properties:
compatible:
additionalItems: true
--
2.29.2
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