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Renesas R-Car CAN FD controller Device Tree Bindings
----------------------------------------------------
Required properties:
- compatible: Must contain one or more of the following:
- "renesas,rcar-gen3-canfd" for R-Car Gen3 compatible controller.
- "renesas,r8a7795-canfd" for R8A7795 (R-Car H3) compatible controller.
When compatible with the generic version, nodes must list the
SoC-specific version corresponding to the platform first, followed by the
family-specific and/or generic versions.
- reg: physical base address and size of the R-Car CAN FD register map.
- interrupts: interrupt specifier for the Global & Channel interrupts
- clocks: phandles and clock specifiers for 3 clock inputs.
- clock-names: 3 clock input name strings: "fck", "canfd", "can_clk".
- pinctrl-0: pin control group to be used for this controller.
- pinctrl-names: must be "default".
Required child nodes:
The controller supports two channels and each is represented as a child node.
The name of the child nodes are "channel0" and "channel1" respectively. Each
child node supports the "status" property only, which is used to
enable/disable the respective channel.
Required properties for "renesas,r8a7795-canfd" compatible:
In R8A7795 SoC, canfd clock is a div6 clock and can be used by both CAN
and CAN FD controller at the same time. It needs to be scaled to maximum
frequency if any of these controllers use it. This is done using the
below properties.
- assigned-clocks: phandle of canfd clock.
- assigned-clock-rates: maximum frequency of this clock.
Example
-------
SoC common .dtsi file:
canfd: can@e66c0000 {
compatible = "renesas,r8a7795-canfd",
"renesas,rcar-gen3-canfd";
reg = <0 0xe66c0000 0 0x8000>;
interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&cpg CPG_MOD 914>,
<&cpg CPG_CORE R8A7795_CLK_CANFD>,
<&can_clk>;
clock-names = "fck", "canfd", "can_clk";
assigned-clocks = <&cpg CPG_CORE R8A7795_CLK_CANFD>;
assigned-clock-rates = <40000000>;
power-domains = <&cpg>;
status = "disabled";
channel0 {
status = "disabled";
};
channel1 {
status = "disabled";
};
};
Board specific .dts file:
E.g. below enables Channel 1 alone in the board.
&canfd {
pinctrl-0 = <&canfd1_pins>;
pinctrl-names = "default";
status = "okay";
channel1 {
status = "okay";
};
};
E.g. below enables Channel 0 alone in the board using External clock
as fCAN clock.
&canfd {
pinctrl-0 = <&canfd0_pins &can_clk_pins>;
pinctrl-names = "default";
status = "okay";
channel0 {
status = "okay";
};
};
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