From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Zhao Subject: Re: [PATCH 6/9] serial: tegra: move to generic dma DT binding Date: Tue, 30 Jul 2013 11:31:35 +0800 Message-ID: <20130730033134.GM15855@rizhao-lap> References: <1374639002-16753-1-git-send-email-rizhao@nvidia.com> <1374639002-16753-7-git-send-email-rizhao@nvidia.com> <51F2D063.5010505@wwwdotorg.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Return-path: In-Reply-To: <51F2D063.5010505-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> Content-Disposition: inline Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Stephen Warren Cc: "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , "linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org" List-Id: linux-tegra@vger.kernel.org On Sat, Jul 27, 2013 at 03:39:15AM +0800, Stephen Warren wrote: > On 07/23/2013 10:09 PM, Richard Zhao wrote: > > - driver: remove use of nvidia,dma-request-selector > > use dma_request_slave_channel to request channel > > - update binding doc > > This patch needs to be amended so that the DMA channel is looked up > during probe() rather than open(), to guarantee that deferred probe > works. It's possible to hold off probe, but not possible AFAIK to hold > off opening the port. How about avoid return -EPROBE_DEFER at open() time? It can be in another patch. Thanks Richard