From mboxrd@z Thu Jan 1 00:00:00 1970 From: Piotr =?iso-8859-1?Q?Kr=F3l?= Subject: amba-pl011 complains about DMA for bcm2835 where it is not supported Date: Tue, 28 Oct 2014 00:44:31 +0100 Message-ID: <20141027234430.GA1788@haysend> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from az0017.srv.az.pl ([46.242.145.17]:48001 "EHLO az0017.srv.az.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752734AbaJ1ADK (ORCPT ); Mon, 27 Oct 2014 20:03:10 -0400 Content-Disposition: inline Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: linux-serial@vger.kernel.org Cc: jslaby@suse.cz, gregkh@linuxfoundation.org, linux@arm.linux.org.uk Hi all, according to BCM2835 ARM Peripherals spec DMA is optional functionality for ARM PL011 UART and it is not supported on this SoC. It looks like amba-pl011 search for device tree property (dma-names) unconditionally, what leads to error message: of_dma_request_slave_channel: dma-names property of node '/soc/uart@7e2= 01000' missing or empty uart-pl011 20201000.uart: no DMA platform data I assume that if it is possible that amba-pl011 can be without DMA we should check if DMA is supported and then try to read properties. Is there any known method for checking dma support ? If yes that I would b= e glad for any pointers. Let me know if I should ignore/accept this error message or there is some code fix needed. Thanks, Piotr Kr=F3l ~ -- To unsubscribe from this list: send the line "unsubscribe linux-serial"= in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html