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can: sja1000: generic OF platform bus driver

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This patch adds a generic driver for SJA1000 chips on the OpenFirmware
platform bus found on embedded PowerPC systems. You need a SJA1000 node
definition in your flattened device tree source (DTS) file similar to:

  can@3,100 {
  	compatible = "nxp,sja1000";
  	reg = <3 0x100 0x80>;
  	interrupts = <2 0>;
  	interrupt-parent = <&mpic>;
  	nxp,external-clock-frequency = <16000000>;
  };

See also Documentation/powerpc/dts-bindings/can/sja1000.txt.

CC: [email protected]
Signed-off-by: Wolfgang Grandegger <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Wolfgang Grandegger 2009-05-30 07:55:50 +00:00 • committed by David S. Miller
commit d1a277c584
5 changed files with 299 additions and 0 deletions
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Documentation/powerpc/dts-bindings/can/sja1000.txt Normal file
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Memory mapped SJA1000 CAN controller from NXP (formerly Philips)
Required properties:
- compatible : should be "nxp,sja1000".
- reg : should specify the chip select, address offset and size required
to map the registers of the SJA1000. The size is usually 0x80.
- interrupts: property with a value describing the interrupt source
(number and sensitivity) required for the SJA1000.
Optional properties:
- nxp,external-clock-frequency : Frequency of the external oscillator
clock in Hz. Note that the internal clock frequency used by the
SJA1000 is half of that value. If not specified, a default value
of 16000000 (16 MHz) is used.
- nxp,tx-output-mode : operation mode of the TX output control logic:
<0x0> : bi-phase output mode
<0x1> : normal output mode (default)
<0x2> : test output mode
<0x3> : clock output mode
- nxp,tx-output-config : TX output pin configuration:
<0x01> : TX0 invert
<0x02> : TX0 pull-down (default)
<0x04> : TX0 pull-up
<0x06> : TX0 push-pull
<0x08> : TX1 invert
<0x10> : TX1 pull-down
<0x20> : TX1 pull-up
<0x30> : TX1 push-pull
- nxp,clock-out-frequency : clock frequency in Hz on the CLKOUT pin.
If not specified or if the specified value is 0, the CLKOUT pin
will be disabled.
- nxp,no-comparator-bypass : Allows to disable the CAN input comperator.
For futher information, please have a look to the SJA1000 data sheet.
Examples:
can@3,100 {
compatible = "nxp,sja1000";
reg = <3 0x100 0x80>;
interrupts = <2 0>;
interrupt-parent = <&mpic>;
nxp,external-clock-frequency = <16000000>;
};