From: <atull@opensource.altera.com>
To: <wsa@the-dreams.de>, <baruch@tkos.co.il>,
<mika.westerberg@linux.intel.com>
Cc: <grant.likely@linaro.org>, <robh+dt@kernel.org>,
<skuribay@pobox.com>, <Romain.Baeriswyl@abilis.com>,
<rafael.j.wysocki@intel.com>, <alan@linux.intel.com>,
<linux-i2c@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<devicetree@vger.kernel.org>, <delicious.quinoa@gmail.com>,
<dinguyen@opensource.altera.com>,
<yvanderv@opensource.altera.com>,
Alan Tull <atull@opensource.altera.com>
Subject: [PATCH 1/2] i2c: designware: device tree bindings for i2c speed mode
Date: Tue, 19 Aug 2014 13:34:35 -0500 [thread overview]
Message-ID: <1408473276-10847-1-git-send-email-atull@opensource.altera.com> (raw)
From: Alan Tull <atull@opensource.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@opensource.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@1120000 {
--
1.7.9.5
next reply other threads:[~2014-08-19 18:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-19 18:34 atull [this message]
2014-08-19 18:34 ` [PATCH 2/2] i2c: designware: add speed mode device tree setting atull
2014-08-19 19:15 ` [PATCH 1/2] i2c: designware: device tree bindings for i2c speed mode Wolfram Sang
2014-08-19 20:24 ` atull
2014-08-20 9:34 ` Mark Rutland
2014-08-20 9:36 ` Mark Rutland
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