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SubjectRe: [PATCH 1/5] dmaengine: add ep93xx DMA support
2011/5/26 H Hartley Sweeten <>:

> I think the biggest hurdle with using the amba-pl022 driver is that the ep93xx
> spi peripheral does not have the registers with the pid and cid id's.  Without
> those I don't think the amba bus driver will be able to match the device to
> the driver.

This is not a problem. We have this code to dynamically create and
register a device with a specific periphid on ux500. It worked even
before my recent patches to amba's bus.c if you have only
zeroes in these registers:

struct amba_device *
dbx500_add_amba_device(const char *name, resource_size_t base,
int irq, void *pdata, unsigned int periphid)
struct amba_device *dev;
int ret;

dev = kzalloc(sizeof *dev, GFP_KERNEL);
if (!dev)
return ERR_PTR(-ENOMEM);

dev->dev.init_name = name;

dev->res.start = base;
dev->res.end = base + SZ_4K - 1;
dev->res.flags = IORESOURCE_MEM;

dev->dma_mask = DMA_BIT_MASK(32);
dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);

dev->irq[0] = irq;
dev->irq[1] = NO_IRQ;

dev->periphid = periphid;

dev->dev.platform_data = pdata;

ret = amba_device_register(dev, &iomem_resource);
if (ret) {
return ERR_PTR(ret);

return dev;

I'd recommend coming up with some clever numbering scheme
with invented vendor ID.

Linus Walleij
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