On Tue, May 15, 2012 at 03:03:55PM +0100, Russell King - ARM Linux wrote:
> On Tue, May 15, 2012 at 09:58:20PM +0800, Richard Zhao wrote:
> > + plat_ci = platform_device_alloc("ci_hdrc", (int)res->start);
> > + if (!plat_ci) {
> > + dev_err(&pdev->dev, "can't allocate ci_hdrc platform device\n");
> > + return -ENOMEM;
> > + }
> > +
> > + ret = platform_device_add_resources(plat_ci, pdev->resource,
> > + pdev->num_resources);
> > + if (ret) {
> > + dev_err(&pdev->dev, "can't add resources to platform device\n");
> > + goto put_platform;
> > + }
> > +
> > + ret = platform_device_add_data(plat_ci, &ci13xxx_imx_udc_driver,
> > + sizeof(ci13xxx_imx_udc_driver));
> > + if (ret)
> > + goto put_platform;
> > +
> > + plat_ci->dev.dma_mask =
> > + kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
> > + if (!plat_ci->dev.dma_mask) {
> > + ret = -ENOMEM;
> > + goto put_platform;
> > + }
> > + *plat_ci->dev.dma_mask = DMA_BIT_MASK(32);
> > + plat_ci->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> > +
> > + ret = platform_device_add(plat_ci);
>
> Is there a reason not to use platform_device_register_full() ?
platform_device_register_full() allocate the dma_mask but
platform_device_unregister() didn't free it. I have to free it
manually? Sounds strange.
Thanks
Richard
>
> Also, you don't set the parent device - is there a dependency between
> 'pdev' and this new platform device you're creating? If so, it should
> be a child of 'pdev'.
>
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