PAD_CTL_SRE_FAST 55 arch/arm/mach-imx/iomux-mx3.h PAD_CTL_SRE_FAST = 0x1 << 0 PAD_CTL_SRE_FAST 93 arch/arm/mach-imx/iomux-v3.h #define PAD_CTL_SRE_FAST (1 << 0)