uart_fdt_get_clock
if ((err = uart_fdt_get_clock(node, &clk)) != 0)
if (uart_fdt_get_clock(node, &clk) != 0)
if ((err = uart_fdt_get_clock(node, &clock)) != 0)
int uart_fdt_get_clock(phandle_t node, pcell_t *cell);