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

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Message-Id: <1457942520-12859-3-git-send-email-wxt@rock-chips.com>
Date:	Mon, 14 Mar 2016 16:01:53 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>,
	"David S. Miller" <davem@...emloft.net>,
	Rob Herring <robh+dt@...nel.org>
Cc:	linux-rockchip@...ts.infradead.org, keescook@...gle.com,
	leozwang@...gle.com, sergei.shtylyov@...entembedded.com,
	netdev@...r.kernel.org, Caesar Wang <wxt@...k-chips.com>,
	devicetree@...r.kernel.org, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/9] net: arc_emac: add phy reset is optional for device tree

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@...k-chips.com>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: devicetree@...r.kernel.org
Cc: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc; Alexander Kochetkov <al.kochet@...il.com>

---

Changes in v3:
- As Sergei comments, the original name is better, so
  %s/reset-gpios/phy-reset-gpios
- 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:
-- 
1.9.1