On Mon, Aug 25, 2014 at 01:01:52PM -0600, Stephen Warren wrote: > On 08/18/2014 11:08 AM, Andrew Bresticker wrote: [...] > >+static int tegra_xusb_mbox_probe(struct platform_device *pdev) > > >+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > >+ if (!res) > >+ return -ENODEV; > > Should devm_request_mem_region() be called here to claim the region? > > >+ mbox->regs = devm_ioremap_nocache(&pdev->dev, res->start, > >+ resource_size(res)); > >+ if (!mbox->regs) > >+ return -ENOMEM; > > Is _nocache required? I don't see other drivers using it. I assume there's > nothing special about the mbox registers. Most drivers should be using devm_ioremap_resource() which will use the _nocache variant of devm_ioremap() when appropriate. Usually the region will not be marked cacheable (IORESOURCE_CACHEABLE) and therefore be remapped uncached. Thierry
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