From mboxrd@z Thu Jan 1 00:00:00 1970 From: Harini Katakam Subject: [PATCH 3/4] devicetree: bindings: Add defeature-repeated-start property for Cadence I2C Date: Tue, 2 Dec 2014 15:35:48 +0530 Message-ID: <1417514749-24319-4-git-send-email-harinik@xilinx.com> References: <1417514749-24319-1-git-send-email-harinik@xilinx.com> Return-path: In-Reply-To: <1417514749-24319-1-git-send-email-harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org, grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org, galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org Cc: michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org, soren.brinkmann-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org, vishnum-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org List-Id: linux-i2c@vger.kernel.org From: Vishnu Motghare This patch adds "defeature-repeated-start" property in i2c-cadence.txt. Signed-off-by: Vishnu Motghare Signed-off-by: Harini Katakam --- .../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