linux-kernel - Re: [PATCH v2] ARM: dts: imx6dl: disable dma support for spi on i.mx6dl

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Message-ID: <20140917091922.GA6551@Robin-OptiPlex-780>
Date:	Wed, 17 Sep 2014 17:19:24 +0800
From:	Robin Gong <b38343@...escale.com>
To:	Lucas Stach <l.stach@...gutronix.de>
CC:	<mark.rutland@....com>, <devicetree@...r.kernel.org>,
	<linux@....linux.org.uk>, <pawel.moll@....com>,
	<ijc+devicetree@...lion.org.uk>, <linux-kernel@...r.kernel.org>,
	<robh+dt@...nel.org>, <shawn.guo@...escale.com>,
	<kernel@...gutronix.de>, <galak@...eaurora.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] ARM: dts: imx6dl: disable dma support for spi on
 i.mx6dl

On Wed, Sep 17, 2014 at 10:55:56AM +0200, Lucas Stach wrote:
> Am Mittwoch, den 17.09.2014, 16:41 +0800 schrieb Robin Gong:
> > On Tue, Sep 16, 2014 at 11:50:06AM +0200, Lucas Stach wrote:
> > > Hi Robin,
> > > 
> > > Am Dienstag, den 16.09.2014, 11:41 +0800 schrieb Robin Gong:
> > > > Hi Lucas,
> > > >   I understood your concern,but looks we have to break old DT.
> > > 
> > > Sorry, but this isn't going to happen. And honestly I don't even see the
> > > need to do so.
> > > 
> > > > Our old DT
> > > > support SPI DMA on i.mx6q/dl(v2,b3810c3dc1bcbc6a), but the DMA support patch
> > > > for SPI driver is still in reviewing(v6).
> > > 
> > > So this means now is the time to fix this driver patch to not enable DMA
> > > on imx6dl. Nobody will experience any breakage in this case.
> > >
> > Sorry, i.mx6q and i.mx6dl are totally same, not only IP but also clock. So we
> > can't distinguish them except for different compatible name....
> 
> I know that, but I still don't see the problem.
> 
> If this issue is specific to the ECSPI IP integrated into a imx6dl SoC
> you need to check for the machine compatible in the driver and disable
> DMA support based on this. We generally avoid checking for the machine
> compatible in drivers and prefer to have a specific IP block compatible
> instead, but in that case it's the only reasonable thing to do.
> 
> Regards,
> Lucas
Sounds we make a agreement on use different compatible name, right? I will
make patch for reviewing, thanks.
> -- 
> Pengutronix e.K.             | Lucas Stach                 |
> Industrial Linux Solutions   | http://www.pengutronix.de/  |
> 
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