Device Tree Configuration

For Linux 5.15, UART has the following configuration for a general UART Controller:

uart0: serial@10000000 {
        compatible = "snps,dw-apb-uart";
        reg = <0x0 0x10000000 0x0 0xl0000>;
        reg-io-width = <4>;
        reg-shift = <2>;
        clocks = <&clkgen JH7110_UART0_CLK_CORE>, 
                 <&clkgen JH7110_UART0_CLK_APB>;
        clock-names = "baudclk", ”apb_pclk";
        resets = <&rstgen RSTN_U0_DW_UART_APB>,
                 <&rstgen RSTN_U0_DW_UART_CORE>;
        interrupts = <32>;
        status = "disabled";
};

The following list provides explanations for the parameters included in the above code block.

• compatible: Compatibility information, used to associate the driver and its target device.
• reg: Register base address "0x10000000" and range "0x10000". Make sure you do not change the 2 bits after it, reg-io-width and reg-shift.
• clocks: The clocks used by the UART module.
• clock-names: The names of the above clocks.
• resets: The reset signals used by the UART module.
• interrupts: Hardware interrupt ID.
• status: The work status of the UART module. To enable the module, set this bit as "okay" or to disable the module, set this bit as "disabled".