simple question about struct pointer

[Ben Wu]

Dear All ，Im new to linux kernel program, and found struct pointer is difficult to understand, that the  struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai) means,? why is use the struct pointer assgn another struct pointer??


static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
                 struct snd_pcm_hw_params *params,
                 struct snd_soc_dai *cpu_dai)
{
    struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
    struct s3c_dma_params *dma_data;
    ....................................................................
}
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