Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754336AbaLBKGz (ORCPT ); Tue, 2 Dec 2014 05:06:55 -0500 Received: from mail-oi0-f45.google.com ([209.85.218.45]:64774 "EHLO mail-oi0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751061AbaLBKGw (ORCPT ); Tue, 2 Dec 2014 05:06:52 -0500 From: Harini Katakam To: wsa@the-dreams.de, grant.likely@linaro.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org Cc: michal.simek@xilinx.com, soren.brinkmann@xilinx.com, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, harinik@xilinx.com, vishnum@xilinx.com 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> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1417514749-24319-1-git-send-email-harinik@xilinx.com> References: <1417514749-24319-1-git-send-email-harinik@xilinx.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/