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From: Harini Katakam <harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
To: wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org,
	grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
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Cc: michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org,
	soren.brinkmann-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
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	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org,
	vishnum-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org
Subject: [PATCH 3/4] devicetree: bindings: Add defeature-repeated-start property for Cadence I2C
Date: Tue,  2 Dec 2014 15:35:48 +0530	[thread overview]
Message-ID: <1417514749-24319-4-git-send-email-harinik@xilinx.com> (raw)
In-Reply-To: <1417514749-24319-1-git-send-email-harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>

From: Vishnu Motghare <vishnum-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>

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

Signed-off-by: Vishnu Motghare <vishnum-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Harini Katakam <harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
---
 .../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@e0004000 {
-- 
1.7.9.5

  parent reply	other threads:[~2014-12-02 10:05 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-02 10:05 [PATCH 0/4] Cadence I2C driver fixes Harini Katakam
2014-12-02 10:05 ` [PATCH 1/4] i2c: cadence: Handle > 252 byte transfers Harini Katakam
     [not found] ` <1417514749-24319-1-git-send-email-harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
2014-12-02 10:05   ` [PATCH 2/4] i2c: cadence: Set the hardware time-out register to maximum value Harini Katakam
2014-12-03 11:28     ` Wolfram Sang
2014-12-02 10:05   ` Harini Katakam [this message]
2014-12-02 11:19     ` [PATCH 3/4] devicetree: bindings: Add defeature-repeated-start property for Cadence I2C Mark Rutland
2014-12-02 12:13       ` Harini Katakam
     [not found]         ` <CAFcVECLtPx6shBXJbg9Uf_8fnhkMoO1zpoxGcdda7PSA7z_2rA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-12-02 12:52           ` Wolfram Sang
2014-12-02 13:10             ` Harini Katakam
     [not found]               ` <CAFcVECJwFoFd6GrmF282CG+fELnYb=FNCTDq=RYKky_dHha=Jg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-12-02 13:16                 ` Wolfram Sang
2014-12-02 13:30                   ` Harini Katakam
2014-12-02 14:15                     ` Wolfram Sang
2014-12-02 15:12                       ` Lars-Peter Clausen
2014-12-02 10:05   ` [PATCH 4/4] i2c: cadence: Defeature repeated start based on devicetree property Harini Katakam
     [not found]     ` <1417514749-24319-5-git-send-email-harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
2014-12-02 11:21       ` Mark Rutland

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