Kernel-4.18.0-80.el8_omap_serial

OMAP UART controller

Required properties:

• compatible : should be “ti,omap2-uart” for OMAP2 controllers
• compatible : should be “ti,omap3-uart” for OMAP3 controllers
• compatible : should be “ti,omap4-uart” for OMAP4 controllers
• compatible : should be “ti,am4372-uart” for AM437x controllers
• compatible : should be “ti,am3352-uart” for AM335x controllers
• compatible : should be “ti,dra742-uart” for DRA7x controllers
• reg : address and length of the register space
• interrupts or interrupts-extended : Should contain the uart interrupt

                                  specifier or both the interrupt
                                  controller phandle and interrupt
                                  specifier.
  

• ti,hwmods : Must be “uart“, n being the instance number (1-based)

Optional properties:

• clock-frequency : frequency of the clock input to the UART
• dmas : DMA specifier, consisting of a phandle to the DMA controller

     node and a DMA channel number.
  

• dma-names : “rx” for receive channel, “tx” for transmit channel.
• rs485-rts-delay, rs485-rx-during-tx, linux,rs485-enabled-at-boot-time: see rs485.txt
• rs485-rts-active-high: drive RTS high when sending (default is low).

Example:

            uart4: serial@49042000 {
                    compatible = "ti,omap3-uart";
                    reg = <0x49042000 0x400>;
                    interrupts = <80>;
                    dmas = <&sdma 81 &sdma 82>;
                    dma-names = "tx", "rx";
                    ti,hwmods = "uart4";
                    clock-frequency = <48000000>;
            };