On 09:34 Wed 07 Mar , Russell King - ARM Linux wrote:
> On Wed, Mar 07, 2012 at 10:15:38AM +0100, Jean-Christophe PLAGNIOL-VILLARD
> wrote:
> > +static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);
> > +
> > +static int __devinit ohci_at91_of_init(struct platform_device *pdev)
> > +{
> > + struct device_node *np = pdev->dev.of_node;
> > + int i, ret, gpio;
> > + enum of_gpio_flags flags;
> > + struct at91_usbh_data *pdata;
> > + u32 ports;
> > +
> > + if (!np)
> > + return 0;
> > +
> > + /* Right now device-tree probed devices don't get dma_mask set.
> > + * Since shared usb code relies on it, set it here for now.
> > + * Once we have dma capability bindings this can go away.
> > + */
> > + if (!pdev->dev.dma_mask)
> > + pdev->dev.dma_mask = &at91_ohci_dma_mask;
>
> That sounds like a rather big omission from DT - what's happening to
> address this (before we end up with lots of drivers with this). Pretty
> much any device which does DMA needs both this and the coherent DMA mask
> set properly.
>
> We really don't want this kind of workaround scattered in every driver
> which has been converted to DT.
Tegra do it also
I do yet found a good generic way in DT
Today only usb need I do plan to drop it for 3.5 can we have for 3.4
Best Regards,
J.
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