linux-kernel - RE: [PATCH v2 1/2] dma-mapping: move dma configuration to bus infrastructure

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Date:   Wed, 21 Mar 2018 07:29:38 +0000
From:   Nipun Gupta <nipun.gupta@....com>
To:     Bharat Bhushan <bharat.bhushan@....com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "hch@....de" <hch@....de>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "m.szyprowski@...sung.com" <m.szyprowski@...sung.com>
CC:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "zajec5@...il.com" <zajec5@...il.com>,
        "andy.gross@...aro.org" <andy.gross@...aro.org>,
        "david.brown@...aro.org" <david.brown@...aro.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "vinod.koul@...el.com" <vinod.koul@...el.com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "frowand.list@...il.com" <frowand.list@...il.com>,
        "jarkko.sakkinen@...ux.intel.com" <jarkko.sakkinen@...ux.intel.com>,
        "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        "johan@...nel.org" <johan@...nel.org>,
        "msuchanek@...e.de" <msuchanek@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-soc@...r.kernel.org" <linux-soc@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Leo Li <leoyang.li@....com>
Subject: RE: [PATCH v2 1/2] dma-mapping: move dma configuration to bus
 infrastructure



> -----Original Message-----
> From: Bharat Bhushan
> Sent: Wednesday, March 21, 2018 12:49

> >
> > +int dma_configure(struct device *dev)
> > +{
> > +	if (dev->bus->dma_configure)
> > +		return dev->bus->dma_configure(dev);
> 
> What if dma_common_configure() is called in case "bus->dma_configure" is
> not defined?
> 
> Thanks
> -Bharat

I think it is cleaner for bus to call '/dma_common_configure/' rather
than this been called implicitly, but Robin/Christoph can comment
better on this.

Thanks,
Nipun