> +/*
> + * The mem2_dma "device".
> + *
> + * This device "owns" a pool of coherent MEM2 memory that can be shared among
> + * several devices requiring MEM2 DMA buffers, instead of dedicating specific
> + * pools for each device.
> + *
> + * A device can use the shared coherent MEM2 memory pool by calling
> + * wii_set_mem2_dma_constraints().
> + *
> + */
> +
> +struct mem2_dma {
> + struct platform_device *pdev;
> +
The space there isn't neccessary.
> + dma_addr_t dma_base;
I think you need only one of them. You don't seem to use 'base'
> + void *base;
> + size_t size;
> +};
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