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This commit adds documentation for the Technologic Systems version of SJA1000. The difference with the NXP version is in the way the registers are accessed. Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
59 lines
1.8 KiB
Plaintext
59 lines
1.8 KiB
Plaintext
Memory mapped SJA1000 CAN controller from NXP (formerly Philips)
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Required properties:
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- compatible : should be one of "nxp,sja1000", "technologic,sja1000".
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- reg : should specify the chip select, address offset and size required
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to map the registers of the SJA1000. The size is usually 0x80.
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- interrupts: property with a value describing the interrupt source
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(number and sensitivity) required for the SJA1000.
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Optional properties:
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- reg-io-width : Specify the size (in bytes) of the IO accesses that
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should be performed on the device. Valid value is 1, 2 or 4.
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This property is ignored for technologic version.
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Default to 1 (8 bits).
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- nxp,external-clock-frequency : Frequency of the external oscillator
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clock in Hz. Note that the internal clock frequency used by the
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SJA1000 is half of that value. If not specified, a default value
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of 16000000 (16 MHz) is used.
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- nxp,tx-output-mode : operation mode of the TX output control logic:
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<0x0> : bi-phase output mode
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<0x1> : normal output mode (default)
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<0x2> : test output mode
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<0x3> : clock output mode
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- nxp,tx-output-config : TX output pin configuration:
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<0x01> : TX0 invert
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<0x02> : TX0 pull-down (default)
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<0x04> : TX0 pull-up
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<0x06> : TX0 push-pull
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<0x08> : TX1 invert
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<0x10> : TX1 pull-down
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<0x20> : TX1 pull-up
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<0x30> : TX1 push-pull
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- nxp,clock-out-frequency : clock frequency in Hz on the CLKOUT pin.
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If not specified or if the specified value is 0, the CLKOUT pin
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will be disabled.
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- nxp,no-comparator-bypass : Allows to disable the CAN input comparator.
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For further information, please have a look to the SJA1000 data sheet.
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Examples:
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can@3,100 {
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compatible = "nxp,sja1000";
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reg = <3 0x100 0x80>;
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interrupts = <2 0>;
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interrupt-parent = <&mpic>;
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nxp,external-clock-frequency = <16000000>;
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};
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