BCM2835_I2S_CLKM 542 sound/soc/bcm/bcm2835-i2s.c mode |= BCM2835_I2S_CLKM; BCM2835_I2S_CLKM 608 sound/soc/bcm/bcm2835-i2s.c !!(mode & BCM2835_I2S_CLKM),