linux-kernel - Re: [PATCH] dw_dmac: absence of pdata isn't critical when autocfg is set

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Message-ID: <1352728712.11158.291.camel@smile>
Date:	Mon, 12 Nov 2012 15:58:32 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	viresh kumar <viresh.kumar@...aro.org>
Cc:	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCH] dw_dmac: absence of pdata isn't critical when autocfg
 is set

On Mon, 2012-11-12 at 19:24 +0530, viresh kumar wrote: 
> On Mon, Nov 12, 2012 at 4:53 PM, Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> 
> >  static int __devinit dw_probe(struct platform_device *pdev)
> >  {
> >         struct dw_dma_platform_data *pdata;
> > @@ -1604,9 +1610,6 @@ static int __devinit dw_probe(struct platform_device *pdev)
> >         if (!pdata)
> >                 pdata = dw_dma_parse_dt(pdev);
> >
> > -       if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS)
> > -               return -EINVAL;
> > -
> >         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >         if (!io)
> >                 return -EINVAL;
> > @@ -1622,6 +1625,12 @@ static int __devinit dw_probe(struct platform_device *pdev)
> >         dw_params = dma_read_byaddr(regs, DW_PARAMS);
> >         autocfg = dw_params >> DW_PARAMS_EN & 0x1;
> >
> > +       if (!pdata && autocfg)
> > +               pdata = &dw_dma_pdata;
> 
> Allocate it dynamically to support multiple controllers with different
> configuration
> in a SoC.

Like you did for device tree? No problem, but here is the question: what
the default values should be and where we can get them?


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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