97 lines
2.9 KiB
Plaintext
97 lines
2.9 KiB
Plaintext
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Renesas R-Car CAN FD controller Device Tree Bindings
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----------------------------------------------------
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Required properties:
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- compatible: Must contain one or more of the following:
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- "renesas,rcar-gen3-canfd" for R-Car Gen3 compatible controller.
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- "renesas,r8a7795-canfd" for R8A7795 (R-Car H3) compatible controller.
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When compatible with the generic version, nodes must list the
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SoC-specific version corresponding to the platform first, followed by the
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family-specific and/or generic versions.
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- reg: physical base address and size of the R-Car CAN FD register map.
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- interrupts: interrupt specifier for the Global & Channel interrupts
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- clocks: phandles and clock specifiers for 3 clock inputs.
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- clock-names: 3 clock input name strings: "fck", "canfd", "can_clk".
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- pinctrl-0: pin control group to be used for this controller.
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- pinctrl-names: must be "default".
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Required child nodes:
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The controller supports two channels and each is represented as a child node.
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The name of the child nodes are "channel0" and "channel1" respectively. Each
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child node supports the "status" property only, which is used to
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enable/disable the respective channel.
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Required properties for "renesas,r8a7795-canfd" compatible:
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In R8A7795 SoC, canfd clock is a div6 clock and can be used by both CAN
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and CAN FD controller at the same time. It needs to be scaled to maximum
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frequency if any of these controllers use it. This is done using the
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below properties.
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- assigned-clocks: phandle of canfd clock.
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- assigned-clock-rates: maximum frequency of this clock.
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Optional property:
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The controller can operate in either CAN FD only mode (default) or
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Classical CAN only mode. The mode is global to both the channels. In order to
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enable the later, define the following optional property.
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- renesas,no-can-fd: puts the controller in Classical CAN only mode.
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Example
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-------
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SoC common .dtsi file:
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canfd: can@e66c0000 {
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compatible = "renesas,r8a7795-canfd",
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"renesas,rcar-gen3-canfd";
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reg = <0 0xe66c0000 0 0x8000>;
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interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&cpg CPG_MOD 914>,
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<&cpg CPG_CORE R8A7795_CLK_CANFD>,
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<&can_clk>;
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clock-names = "fck", "canfd", "can_clk";
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assigned-clocks = <&cpg CPG_CORE R8A7795_CLK_CANFD>;
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assigned-clock-rates = <40000000>;
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power-domains = <&cpg>;
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status = "disabled";
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channel0 {
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status = "disabled";
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};
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channel1 {
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status = "disabled";
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};
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};
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Board specific .dts file:
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E.g. below enables Channel 1 alone in the board in Classical CAN only mode.
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&canfd {
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pinctrl-0 = <&canfd1_pins>;
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pinctrl-names = "default";
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renesas,no-can-fd;
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status = "okay";
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channel1 {
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status = "okay";
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};
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};
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E.g. below enables Channel 0 alone in the board using External clock
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as fCAN clock.
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&canfd {
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pinctrl-0 = <&canfd0_pins &can_clk_pins>;
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pinctrl-names = "default";
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status = "okay";
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channel0 {
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status = "okay";
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};
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};
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