linux-kernel - Re: [PATCH 2/3] spi: mediatek: Add spi bus for Mediatek MT8173

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Message-ID: <1433923569.22080.1.camel@mtksdaap41>
Date:	Wed, 10 Jun 2015 16:06:09 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Leilk Liu (刘磊) 
	<Leilk.Liu@...iatek.com>, Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	HongZhou Yang <hongzhou.yang@...iatek.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH 2/3] spi: mediatek: Add spi bus for Mediatek MT8173

Hi Mark,

On Tue, 2015-06-09 at 11:39 +0100, Mark Brown wrote:
> On Tue, Jun 09, 2015 at 06:05:21PM +0800, Eddie Huang wrote:
> 
> > --- a/drivers/spi/spi.c
> > +++ b/drivers/spi/spi.c
> > @@ -539,8 +539,8 @@ static int __spi_map_msg(struct spi_master *master,
> > struct spi_message *msg)
> >         if (!master->can_dma)
> >                 return 0;
> 
> > -       tx_dev = master->dma_tx->device->dev;
> > -       rx_dev = master->dma_rx->device->dev;
> > +       tx_dev = master->dma_tx ? master->dma_tx->device->dev :
> > master->dev;
> > +       rx_dev = master->dma_rx ? master->dma_rx->device->dev : master-
> 
> > Is this what you want ? Actually, I don't like first one at all.
> 
> Not quite what I'd been thinking of - we can't just pick the device in
> the core safely, the device might be a MFD or have some other
> restriction that needs us to use a separate struct device.  However most
> of those cases are likely to point towards implementing a dmaengine
> device so probably the above will work for most cases and is fine.  Can
> you send a proper patch please?

Sure, we will send this with new MTK SPI driver, such that can verify
it.

> 
> Please don't use the ternery operator, though.
OK, will fix it

Eddie
Thanks


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