From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751936AbcF3DzS (ORCPT ); Wed, 29 Jun 2016 23:55:18 -0400 Received: from mail-pa0-f54.google.com ([209.85.220.54]:33234 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751703AbcF3Dyr (ORCPT ); Wed, 29 Jun 2016 23:54:47 -0400 From: apronin@chromium.org To: Mark Brown Cc: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, Andrey Pronin Subject: [PATCH 4/4] spi: Document option to insert delay between transactions Date: Wed, 29 Jun 2016 20:54:27 -0700 Message-Id: <1467258867-117727-4-git-send-email-apronin@chromium.org> X-Mailer: git-send-email 2.8.0.rc3.226.g39d4020 In-Reply-To: <1467258867-117727-1-git-send-email-apronin@chromium.org> References: <1467258867-117727-1-git-send-email-apronin@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrey Pronin Some devices may need CS to be deasserted for some time between transactions. Added a new capability to guarantee a delay between SPI transactions for the device. Signed-off-by: Andrey Pronin --- Documentation/devicetree/bindings/spi/spi-bus.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt index 1b7ffd4..87c117a 100644 --- a/Documentation/devicetree/bindings/spi/spi-bus.txt +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt @@ -70,6 +70,8 @@ contain the following properties. sleep if there was no SPI activity (msec). - cs-wake-duration - (optional) Time it takes the device to wake up after toggling CS if it went to sleep (msec). +- xfer-delay - (optional) Delay to insert between SPI transactions + to guarantee that CS is deasserted at least for some time. Some SPI controllers and devices support Dual and Quad SPI transfer mode. It allows data in the SPI system to be transferred in 2 wires(DUAL) or 4 wires(QUAD). -- 2.6.6