Question about s3c24xx_dma_addr in kernel ?

[peter meng <mengsanshui@yahoo.com.cn>]

HI

I found never used both the from and to field of s3c24xx_dma_addr in Linux except declare s3c24XX_dma_mappings .

So I want to know why still leave this struct in kernel ? 


Thanks a lot .
Best Regards.
Peter Meng 


struct s3c24xx_dma_addr {
	unsigned long		from;
	unsigned long		to;
};

struct s3c24xx_dma_map {
	const char		*name;
	struct s3c24xx_dma_addr  hw_addr;

	unsigned long		 channels[S3C2410_DMA_CHANNELS];
	unsigned long		 channels_rx[S3C2410_DMA_CHANNELS];
};

static struct s3c24xx_dma_map __initdata s3c2412_dma_mappings[] = {
	[DMACH_XD0] = {
		.name		= "xdreq0",
		.channels	= MAP(S3C2412_DMAREQSEL_XDREQ0),
		.channels_rx	= MAP(S3C2412_DMAREQSEL_XDREQ0),
	},
	[DMACH_XD1] = {
		.name		= "xdreq1",
		.channels	= MAP(S3C2412_DMAREQSEL_XDREQ1),
		.channels_rx	= MAP(S3C2412_DMAREQSEL_XDREQ1),
	},
	[DMACH_SDI] = {
		.name		= "sdi",
		.channels	= MAP(S3C2412_DMAREQSEL_SDI),
		.channels_rx	= MAP(S3C2412_DMAREQSEL_SDI),
		.hw_addr.to	= S3C2410_PA_SDI + S3C2410_SDIDATA,
		.hw_addr.from	= S3C2410_PA_SDI + S3C2410_SDIDATA,
        ..........