linux-kernel - [PATCH 3/4] devicetree: bindings: Add defeature-repeated-start property for Cadence I2C

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Message-Id: <1417514749-24319-4-git-send-email-harinik@xilinx.com>
Date:	Tue,  2 Dec 2014 15:35:48 +0530
From:	Harini Katakam <harinik@...inx.com>
To:	wsa@...-dreams.de, grant.likely@...aro.org, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org
Cc:	michal.simek@...inx.com, soren.brinkmann@...inx.com,
	linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	harinik@...inx.com, vishnum@...inx.com
Subject: [PATCH 3/4] devicetree: bindings: Add defeature-repeated-start property for Cadence I2C

From: Vishnu Motghare <vishnum@...inx.com>

This patch adds "defeature-repeated-start" property in i2c-cadence.txt.

Signed-off-by: Vishnu Motghare <vishnum@...inx.com>
Signed-off-by: Harini Katakam <harinik@...inx.com>
---
 .../devicetree/bindings/i2c/i2c-cadence.txt        |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-cadence.txt b/Documentation/devicetree/bindings/i2c/i2c-cadence.txt
index 7cb0b56..9d417a7 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-cadence.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-cadence.txt
@@ -11,6 +11,17 @@ Required properties:
 Optional properties:
   - clock-frequency: Desired operating frequency, in Hz, of the bus.
   - clock-names: Input clock name, should be 'pclk'.
+  - defeature-repeated-start: Include this property to defeature repeated start
+			      This defeature is due to a few bugs in the
+			      I2C controller.
+			      Completion interrupt after a read/receive
+			      operation is NOT obtained if HOLD bit is set
+			      at that time. Because of this bug, repeated start
+			      will only work if there are no transfers following
+			      a read/receive transfer.
+			      If HOLD is held for long without a transfer,
+			      invalid read transactions are generated by the
+			      controller due to a HW timeout related bug.
 
 Example:
 	i2c@...04000 {
-- 
1.7.9.5

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