US_ 70 drivers/spi/spi-at91-usart.c readl_relaxed((port)->regs + US_##reg) US_ 72 drivers/spi/spi-at91-usart.c writel_relaxed((value), (port)->regs + US_##reg) US_ 75 drivers/spi/spi-at91-usart.c readb_relaxed((port)->regs + US_##reg) US_ 77 drivers/spi/spi-at91-usart.c writeb_relaxed((value), (port)->regs + US_##reg)