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,
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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
next prev 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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