/* RCC Set the Source for the USB Clock.  */
void rcc_set_usbclk_source(enum rcc_osc clk)
/* RCC Set the Source for the USB Clock.  */
void rcc_set_usbclk_source(enum rcc_osc clk)
{
	switch (clk) {
	case RCC_PLL:
		RCC_CFGR3 |= RCC_CFGR3_USBSW;
		break;
	case RCC_HSI48:
		RCC_CFGR3 &= ~RCC_CFGR3_USBSW;
		break;
	case RCC_HSI:
	case RCC_HSE:
	case RCC_LSI:
	case RCC_LSE:
	case RCC_HSI14:
		break;
	}
}