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7d4008eb JI |
1 | * Synopsys DesignWare ABP UART |
2 | ||
3 | Required properties: | |
4 | - compatible : "snps,dw-apb-uart" | |
5 | - reg : offset and length of the register set for the device. | |
6 | - interrupts : should contain uart interrupt. | |
7d78cbef HS |
7 | |
8 | Clock handling: | |
9 | The clock rate of the input clock needs to be supplied by one of | |
7d4008eb | 10 | - clock-frequency : the input clock frequency for the UART. |
7d78cbef HS |
11 | - clocks : phandle to the input clock |
12 | ||
13 | The supplying peripheral clock can also be handled, needing a second property | |
14 | - clock-names: tuple listing input clock names. | |
15 | Required elements: "baudclk", "apb_pclk" | |
7d4008eb JI |
16 | |
17 | Optional properties: | |
c73942e2 HK |
18 | - snps,uart-16550-compatible : reflects the value of UART_16550_COMPATIBLE |
19 | configuration parameter. Define this if your UART does not implement the busy | |
20 | functionality. | |
7fe090bf | 21 | - resets : phandle to the parent reset controller. |
7d4008eb JI |
22 | - reg-shift : quantity to shift the register offsets by. If this property is |
23 | not present then the register offsets are not shifted. | |
24 | - reg-io-width : the size (in bytes) of the IO accesses that should be | |
25 | performed on the device. If this property is not present then single byte | |
26 | accesses are used. | |
dfd37668 DL |
27 | - dcd-override : Override the DCD modem status signal. This signal will always |
28 | be reported as active instead of being obtained from the modem status | |
29 | register. Define this if your serial port does not use this pin. | |
30 | - dsr-override : Override the DTS modem status signal. This signal will always | |
31 | be reported as active instead of being obtained from the modem status | |
32 | register. Define this if your serial port does not use this pin. | |
33 | - cts-override : Override the CTS modem status signal. This signal will always | |
34 | be reported as active instead of being obtained from the modem status | |
35 | register. Define this if your serial port does not use this pin. | |
36 | - ri-override : Override the RI modem status signal. This signal will always be | |
37 | reported as inactive instead of being obtained from the modem status register. | |
38 | Define this if your serial port does not use this pin. | |
7d4008eb JI |
39 | |
40 | Example: | |
41 | ||
42 | uart@80230000 { | |
43 | compatible = "snps,dw-apb-uart"; | |
44 | reg = <0x80230000 0x100>; | |
45 | clock-frequency = <3686400>; | |
46 | interrupts = <10>; | |
47 | reg-shift = <2>; | |
48 | reg-io-width = <4>; | |
dfd37668 DL |
49 | dcd-override; |
50 | dsr-override; | |
51 | cts-override; | |
52 | ri-override; | |
7d4008eb | 53 | }; |
7d78cbef HS |
54 | |
55 | Example with one clock: | |
56 | ||
57 | uart@80230000 { | |
58 | compatible = "snps,dw-apb-uart"; | |
59 | reg = <0x80230000 0x100>; | |
60 | clocks = <&baudclk>; | |
61 | interrupts = <10>; | |
62 | reg-shift = <2>; | |
63 | reg-io-width = <4>; | |
64 | }; | |
65 | ||
66 | Example with two clocks: | |
67 | ||
68 | uart@80230000 { | |
69 | compatible = "snps,dw-apb-uart"; | |
70 | reg = <0x80230000 0x100>; | |
71 | clocks = <&baudclk>, <&apb_pclk>; | |
72 | clock-names = "baudclk", "apb_pclk"; | |
73 | interrupts = <10>; | |
74 | reg-shift = <2>; | |
75 | reg-io-width = <4>; | |
76 | }; |