1*75219d57SThomas Chou* Synopsys DesignWare ABP UART 2*75219d57SThomas Chou 3*75219d57SThomas ChouRequired properties: 4*75219d57SThomas Chou- compatible : "snps,dw-apb-uart" 5*75219d57SThomas Chou- reg : offset and length of the register set for the device. 6*75219d57SThomas Chou- interrupts : should contain uart interrupt. 7*75219d57SThomas Chou 8*75219d57SThomas ChouClock handling: 9*75219d57SThomas ChouThe clock rate of the input clock needs to be supplied by one of 10*75219d57SThomas Chou- clock-frequency : the input clock frequency for the UART. 11*75219d57SThomas Chou- clocks : phandle to the input clock 12*75219d57SThomas Chou 13*75219d57SThomas ChouThe supplying peripheral clock can also be handled, needing a second property 14*75219d57SThomas Chou- clock-names: tuple listing input clock names. 15*75219d57SThomas Chou Required elements: "baudclk", "apb_pclk" 16*75219d57SThomas Chou 17*75219d57SThomas ChouOptional properties: 18*75219d57SThomas Chou- snps,uart-16550-compatible : reflects the value of UART_16550_COMPATIBLE 19*75219d57SThomas Chou configuration parameter. Define this if your UART does not implement the busy 20*75219d57SThomas Chou functionality. 21*75219d57SThomas Chou- resets : phandle to the parent reset controller. 22*75219d57SThomas Chou- reg-shift : quantity to shift the register offsets by. If this property is 23*75219d57SThomas Chou not present then the register offsets are not shifted. 24*75219d57SThomas Chou- reg-io-width : the size (in bytes) of the IO accesses that should be 25*75219d57SThomas Chou performed on the device. If this property is not present then single byte 26*75219d57SThomas Chou accesses are used. 27*75219d57SThomas Chou- dcd-override : Override the DCD modem status signal. This signal will always 28*75219d57SThomas Chou be reported as active instead of being obtained from the modem status 29*75219d57SThomas Chou register. Define this if your serial port does not use this pin. 30*75219d57SThomas Chou- dsr-override : Override the DTS modem status signal. This signal will always 31*75219d57SThomas Chou be reported as active instead of being obtained from the modem status 32*75219d57SThomas Chou register. Define this if your serial port does not use this pin. 33*75219d57SThomas Chou- cts-override : Override the CTS modem status signal. This signal will always 34*75219d57SThomas Chou be reported as active instead of being obtained from the modem status 35*75219d57SThomas Chou register. Define this if your serial port does not use this pin. 36*75219d57SThomas Chou- ri-override : Override the RI modem status signal. This signal will always be 37*75219d57SThomas Chou reported as inactive instead of being obtained from the modem status register. 38*75219d57SThomas Chou Define this if your serial port does not use this pin. 39*75219d57SThomas Chou 40*75219d57SThomas ChouExample: 41*75219d57SThomas Chou 42*75219d57SThomas Chou uart@80230000 { 43*75219d57SThomas Chou compatible = "snps,dw-apb-uart"; 44*75219d57SThomas Chou reg = <0x80230000 0x100>; 45*75219d57SThomas Chou clock-frequency = <3686400>; 46*75219d57SThomas Chou interrupts = <10>; 47*75219d57SThomas Chou reg-shift = <2>; 48*75219d57SThomas Chou reg-io-width = <4>; 49*75219d57SThomas Chou dcd-override; 50*75219d57SThomas Chou dsr-override; 51*75219d57SThomas Chou cts-override; 52*75219d57SThomas Chou ri-override; 53*75219d57SThomas Chou }; 54*75219d57SThomas Chou 55*75219d57SThomas ChouExample with one clock: 56*75219d57SThomas Chou 57*75219d57SThomas Chou uart@80230000 { 58*75219d57SThomas Chou compatible = "snps,dw-apb-uart"; 59*75219d57SThomas Chou reg = <0x80230000 0x100>; 60*75219d57SThomas Chou clocks = <&baudclk>; 61*75219d57SThomas Chou interrupts = <10>; 62*75219d57SThomas Chou reg-shift = <2>; 63*75219d57SThomas Chou reg-io-width = <4>; 64*75219d57SThomas Chou }; 65*75219d57SThomas Chou 66*75219d57SThomas ChouExample with two clocks: 67*75219d57SThomas Chou 68*75219d57SThomas Chou uart@80230000 { 69*75219d57SThomas Chou compatible = "snps,dw-apb-uart"; 70*75219d57SThomas Chou reg = <0x80230000 0x100>; 71*75219d57SThomas Chou clocks = <&baudclk>, <&apb_pclk>; 72*75219d57SThomas Chou clock-names = "baudclk", "apb_pclk"; 73*75219d57SThomas Chou interrupts = <10>; 74*75219d57SThomas Chou reg-shift = <2>; 75*75219d57SThomas Chou reg-io-width = <4>; 76*75219d57SThomas Chou }; 77