G_USART1
K_MGATE(G_USART1, RCC_APB5ENSETR, 4, 0),
PCLK(USART1, "usart1", "pclk5", 0, G_USART1),
KCLK(USART1_K, "usart1_k", usart1_src, 0, G_USART1, M_USART1),