linux-kernel - Re: [PATCH 1/1] powerpc: mpc512x_dma: add support for data transfers between memory and i/o memory

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Message-ID: <20130503155223.1eff1d9f@crub>
Date:	Fri, 3 May 2013 15:52:23 +0200
From:	Anatolij Gustschin <agust@...x.de>
To:	Alexander Popov <a13xp0p0v88@...il.com>
Cc:	Vinod Koul <vinod.koul@...el.com>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, Dan Williams <djbw@...com>
Subject: Re: [PATCH 1/1] powerpc: mpc512x_dma: add support for data
 transfers between memory and i/o memory

Hello Alexander,

On Fri, 3 May 2013 14:43:23 +0400
Alexander Popov <a13xp0p0v88@...il.com> wrote:

> Hello Anatolij,
> 
> > Note that there is a patch for .device_prep_slave_sg() operation
> > for this driver as part of this series:
> > https://patchwork.kernel.org/patch/2368581/
> > https://patchwork.kernel.org/patch/2368591/
> Thanks, I haven't seen that patch.
> It's certainly what my SCLPC device driver needs
> (http://patchwork.ozlabs.org/patch/241010/).
> I will send the second version of it which uses .device_prep_slave_sg().
> 
> > maybe you can reuse and improve it.
> > Anatolij
> Should I propose my additions at https://patchwork.kernel.org/patch/2368591/ ?

Yes, I think so. I only used drivers new .device_prep_slave_sg()
for SDHC DMA channel transfers up to now. Adding support for other
peripherals would be good. With generic DMA DT bindings patch for
this driver you can use

    dmas = <&dma0 26>;
    dma-names = "rx-tx";

in your sclpc@...00 DT node and then
dma_request_slave_channel(&pdev->dev, "rx-tx") in the lpbfifo
driver.

Thanks,

Anatolij

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