[alsa-devel] [PATCH 2/2] ASoC: add pxa-squ dma support

Haojian Zhuang haojian.zhuang at gmail.com
Fri May 18 06:25:58 CEST 2012


On Fri, May 18, 2012 at 10:39 AM, Qiao Zhou <zhouqiao at marvell.com> wrote:
> this patch adds ASoC pxa-squ DMA audio support.
>
> Signed-off-by: Qiao Zhou <zhouqiao at marvell.com>
> +/*
> + * Descriptor structure for PXA's SQU engine
> + * Note: this structure must always be aligned to a 16-byte boundary.
> + */
> +struct pxa_squ_desc {
> +       __iomem u32 byte_cnt;   /* byte count */
> +       __iomem u32 src_addr;   /* source address */
> +       __iomem u32 dst_addr;   /* target address */
> +       __iomem u32 nxt_desc;   /* next descriptor dress */
Why do you use __iomem at here?

> +};
> +
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