Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932258AbbHXGCT (ORCPT ); Mon, 24 Aug 2015 02:02:19 -0400 Received: from mail-pa0-f52.google.com ([209.85.220.52]:35726 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754010AbbHXGCO (ORCPT ); Mon, 24 Aug 2015 02:02:14 -0400 From: Vaibhav Hiremath To: linux-arm-kernel@lists.infradead.org Cc: wsa@the-dreams.de, robh+dt@kernel.org, robert.jarzmik@free.fr, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, Vaibhav Hiremath Subject: [PATCH-v5 RESEND 4/5] Documentation: binding: add sclk adjustment properties to i2c-pxa Date: Mon, 24 Aug 2015 11:29:37 +0530 Message-Id: <1440395978-9065-5-git-send-email-vaibhav.hiremath@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1440395978-9065-1-git-send-email-vaibhav.hiremath@linaro.org> References: <1440395978-9065-1-git-send-email-vaibhav.hiremath@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2151 Lines: 57 With addition of PXA910 family of devices, the TWSI module supports new feature which allows us to adjust SCLK. i2c-pxa driver takes input configuration in nsec and converts it to respective bit-fields, - i2c-sclk-low-time-ns : SCLK low time (tlow) This property is used along with mode selection. - i2c-sclk-high-time-ns : SCLK high time (thigh) - i2c-start-hold-time-ns : Used in case of high speed mode for start bit hold/setup wait counter. - i2c-stop-hold-time-ns : Used in case of high speed mode for stop bit hold/setup wait counter. - i2c-sda-hold-time-ns : Used to calculate hold/setup wait counter for standard and fast mode. Signed-off-by: Vaibhav Hiremath --- Documentation/devicetree/bindings/i2c/i2c-pxa.txt | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/i2c-pxa.txt b/Documentation/devicetree/bindings/i2c/i2c-pxa.txt index 9657db5..bb4df60 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-pxa.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-pxa.txt @@ -23,12 +23,25 @@ Optional properties : - i2c-disable-after-xfer : If set, driver will disable I2C module after msg xfer and enable it again before xfer. + (Applicable to PXA910 family): + + - i2c-sclk-low-time-ns : SCLK low time (tlow), for standard/fast/high + speed mode. + This property is used along with mode selection. Driver uses this property + to set low/high time for standard and fast speed mode, as HW counter + bit-field is same for both. + - i2c-sclk-high-time-ns : SCLK high time (thigh), Used in case of high speed + mode only. + Examples: twsi1: i2c@d4011000 { compatible = "mrvl,mmp-twsi"; reg = <0xd4011000 0x1000>; interrupts = <7>; mrvl,i2c-fast-mode; + + i2c-sclk-low-time-ns = <988>; + i2c-sclk-high-time-ns = <988>; }; twsi2: i2c@d4025000 { -- 1.9.1 -- 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/