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net: arc_emac: add phy reset is optional for device tree

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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@rock-chips.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc; Alexander Kochetkov <al.kochet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Caesar Wang 2016-03-14 16:01:53 +08:00 committed by David S. Miller
parent 434242cd60
commit 8700eee627
1 changed files with 7 additions and 0 deletions
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7
Documentation/devicetree/bindings/net/arc_emac.txt
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@ -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: