[PATCH v3 2/9] net: arc_emac: add phy reset is optional for device tree

From: Caesar Wang
Date: Mon Mar 14 2016 - 04:03:18 EST

This patch adds the following property for arc_emac.

1) phy-reset-gpios:
The phy-reset-gpio is an optional property for arc emac device tree boot.
Change the binding document to match the driver code.

2) phy-reset-duration:
Different boards may require different phy reset duration. Add property
phy-reset-duration for device tree probe, so that the boards that need
a longer reset duration can specify it in their device tree.

Anyway, we can add the above property for arc emac.

Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Cc; Alexander Kochetkov <al.kochet@xxxxxxxxx>


Changes in v3:
- As Sergei comments, the original name is better, so
- Add the Cc people.

Changes in v2:
- %s/phy-reset-gpios/reset-gpios

Documentation/devicetree/bindings/net/arc_emac.txt | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/arc_emac.txt b/Documentation/devicetree/bindings/net/arc_emac.txt
index a1d71eb..c73a0e9 100644
--- a/Documentation/devicetree/bindings/net/arc_emac.txt
+++ b/Documentation/devicetree/bindings/net/arc_emac.txt
@@ -7,6 +7,13 @@ Required properties:
- max-speed: see ethernet.txt file in the same directory.
- phy: see ethernet.txt file in the same directory.

+Optional properties:
+- phy-reset-gpios : Should specify the gpio for phy reset
+- phy-reset-duration : Reset duration in milliseconds. Should present
+ only if property "phy-reset-gpios" is available. Missing the property
+ will have the duration be 1 millisecond. Numbers greater than 1000 are
+ invalid and 1 millisecond will be used instead.
Clock handling:
The clock frequency is needed to calculate and set polling period of EMAC.
It must be provided by one of: