art0 {      pinctrl_usart0: usart0-0 {       atmel,pins =        <AT00_PIOB 0 AT00_PERIPH_A AT00_PINCTRL_PULL_UP /* PB0 periph A with pullup */         AT00_PIOB 0 AT00_PERIPH_A AT00_PINCTRL_NONE>; /* PB0 periph A */      };       pinctrl_usart0_rts: usart0_rts-0 {       atmel,pins =        <AT00_PIOD 00 AT00_PERIPH_A AT00_PINCTRL_NONE>; /* PD00 periph A */      };       pinctrl_usart0_cts: usart0_cts-0 {       atmel,pins =        <AT00_PIOD 00 AT00_PERIPH_A AT00_PINCTRL_NONE>; /* PD00 periph A */      };     };      usart0 {      pinctrl_usart0: usart0-0 {       atmel,pins =        <AT00_PIOB 0 AT00_PERIPH_A AT00_PINCTRL_PULL_UP /* PB0 periph A with pullup */         AT00_PIOB 0 AT00_PERIPH_A AT00_PINCTRL_NONE>; /* PB0 periph A */      };       pinctrl_usart0_rts: usart0_rts-0 {       atmel,pins =        <AT00_PIOC 0 AT00_PERIPH_