xref: /freebsd/sys/contrib/device-tree/Bindings/net/can/sja1000.txt (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
1Memory mapped SJA1000 CAN controller from NXP (formerly Philips)
2
3Required properties:
4
5- compatible : should be one of "nxp,sja1000", "technologic,sja1000".
6
7- reg : should specify the chip select, address offset and size required
8	to map the registers of the SJA1000. The size is usually 0x80.
9
10- interrupts: property with a value describing the interrupt source
11	(number and sensitivity) required for the SJA1000.
12
13Optional properties:
14
15- reg-io-width : Specify the size (in bytes) of the IO accesses that
16	should be performed on the device.  Valid value is 1, 2 or 4.
17	This property is ignored for technologic version.
18	Default to 1 (8 bits).
19
20- nxp,external-clock-frequency : Frequency of the external oscillator
21	clock in Hz. Note that the internal clock frequency used by the
22	SJA1000 is half of that value. If not specified, a default value
23	of 16000000 (16 MHz) is used.
24
25- nxp,tx-output-mode : operation mode of the TX output control logic:
26	<0x0> : bi-phase output mode
27	<0x1> : normal output mode (default)
28	<0x2> : test output mode
29	<0x3> : clock output mode
30
31- nxp,tx-output-config : TX output pin configuration:
32	<0x01> : TX0 invert
33	<0x02> : TX0 pull-down (default)
34	<0x04> : TX0 pull-up
35	<0x06> : TX0 push-pull
36	<0x08> : TX1 invert
37	<0x10> : TX1 pull-down
38	<0x20> : TX1 pull-up
39	<0x30> : TX1 push-pull
40
41- nxp,clock-out-frequency : clock frequency in Hz on the CLKOUT pin.
42	If not specified or if the specified value is 0, the CLKOUT pin
43	will be disabled.
44
45- nxp,no-comparator-bypass : Allows to disable the CAN input comparator.
46
47For further information, please have a look to the SJA1000 data sheet.
48
49Examples:
50
51can@3,100 {
52	compatible = "nxp,sja1000";
53	reg = <3 0x100 0x80>;
54	interrupts = <2 0>;
55	interrupt-parent = <&mpic>;
56	nxp,external-clock-frequency = <16000000>;
57};
58
59