From mboxrd@z Thu Jan 1 00:00:00 1970 From: Huang Shijie Subject: [PATCH v2 0/3] serial: mxs-auart: add RTS/CTS check for DMA support Date: Tue, 16 Jul 2013 14:55:29 +0800 Message-ID: <1373957732-16638-1-git-send-email-b32955@freescale.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from ch1ehsobe005.messaging.microsoft.com ([216.32.181.185]:5775 "EHLO ch1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750913Ab3GPHY7 (ORCPT ); Tue, 16 Jul 2013 03:24:59 -0400 Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: gregkh@linuxfoundation.org Cc: linux-serial@vger.kernel.org, shawn.guo@linaro.org, linux-arm-kernel@lists.infradead.org, u.kleine-koenig@pengutronix.de, Huang Shijie The original DMA support works only when RTS/CTS is enabled. But after several patches, DMA support has lost this limit. So a UART without the RTS/CTS lines may also enables the DMA support for it, but it may does not work or works abnormally (since without the RTS/CTS signals, the TX/RX may not works) This patch set remove the unnecessary macro MXS_AUART_DMA_CONFIG, and adds an optional property "fsl,uart-has-rtscts" for the UART DT node which indicates the UART has RTS and CTS lines. This patch set also adds a macro MXS_AUART_RTSCTS, and uses it to check RTS/CTS before we enable the DMA for the UART. At last, enable the DMA support for auart0 in the imx28-evk boards. v1 --> v2: [0] changed the comments. [1] fix the typos. Huang Shijie (3): serial: mxs: remove the MXS_AUART_DMA_CONFIG serial: mxs: enable the DMA only when the RTS/CTS is valid ARM: dts: imx28-evk: add the RTS/CTS property for auart0 .../bindings/tty/serial/fsl-mxs-auart.txt | 4 ++++ arch/arm/boot/dts/imx28-evk.dts | 1 + drivers/tty/serial/mxs-auart.c | 8 ++++---- 3 files changed, 9 insertions(+), 4 deletions(-)