Messages in this thread | | | From | Lu Jingchang-B35083 <> | Subject | RE: [PATCH v4 3/3] dma: Add Freescale eDMA engine driver support | Date | Thu, 5 Sep 2013 08:18:24 +0000 |
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> -----Original Message----- > From: Vinod Koul [mailto:vinod.koul@intel.com] > Sent: Tuesday, September 03, 2013 7:32 PM > To: Lu Jingchang-B35083 > Cc: shawn.guo@linaro.org; linux-kernel@vger.kernel.org; linux-arm- > kernel@lists.infradead.org; devicetree@vger.kernel.org > Subject: Re: [PATCH v4 3/3] dma: Add Freescale eDMA engine driver support > > On Tue, Sep 03, 2013 at 05:43:21AM +0000, Lu Jingchang-B35083 wrote: > > Do you mean the DMA_SLAVE_CONFIG device_control? Yeah, the slave > driver could pass > > the slave_id. But the DMA_SLAVE_CONFIG may be called more than once, > and the eDMA > > driver just needs to set the slave id once for any given channel, after > that the > > transfer is transparent to the device. > It depends, for a channel requested, if you are only tranferring to a > particular > slave device then it can be confugured once. > so > 1. allocate channel > 2. dmaengine_slave_config() > > then you cnan do preare etc multiple times based on need. But if the preferred slave id configuration should be in dmaengine_slave_config, I will send out this change in the next version patch. Thanks!
Best Regards, Jingchang
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