linux-kernel - [PATCH 1/2] i2c: designware: device tree bindings for i2c speed mode

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Message-ID: <1408473276-10847-1-git-send-email-atull@opensource.altera.com>
Date:	Tue, 19 Aug 2014 13:34:35 -0500
From:	<atull@...nsource.altera.com>
To:	<wsa@...-dreams.de>, <baruch@...s.co.il>,
	<mika.westerberg@...ux.intel.com>
CC:	<grant.likely@...aro.org>, <robh+dt@...nel.org>,
	<skuribay@...ox.com>, <Romain.Baeriswyl@...lis.com>,
	<rafael.j.wysocki@...el.com>, <alan@...ux.intel.com>,
	<linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <delicious.quinoa@...il.com>,
	<dinguyen@...nsource.altera.com>, <yvanderv@...nsource.altera.com>,
	Alan Tull <atull@...nsource.altera.com>
Subject: [PATCH 1/2] i2c: designware: device tree bindings for i2c speed mode

From: Alan Tull <atull@...nsource.altera.com>

Add "speed-mode" Device Tree property to select between
standard and fast i2c mode.  Previously, driver was hardwired
as fast mode.  Default to fast mode if property is not
present.

Signed-off-by: Alan Tull <atull@...nsource.altera.com>
---
 .../devicetree/bindings/i2c/i2c-designware.txt     |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
index 5199b0c..0e4cd21 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
@@ -9,6 +9,8 @@ Required properties :
 Recommended properties :
 
  - clock-frequency : desired I2C bus clock frequency in Hz.
+ - speed-mode      : 0 = standard (0 - 100Kb/s)
+                   : 1 = fast (<= 400Kb/s) <== default
 
 Optional properties :
  - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
@@ -29,6 +31,7 @@ Example :
 		reg = <0xf0000 0x1000>;
 		interrupts = <11>;
 		clock-frequency = <400000>;
+		speed-mode = <0>;
 	};
 
 	i2c@...0000 {
-- 
1.7.9.5

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