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Date: Fri, 7 May 2021 09:51:48 +0200 (CEST)
From: Ulrich Hecht <uli@...nd.eu>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
Sergei Shtylyov <sergei.shtylyov@...il.com>,
Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
Wolfgang Grandegger <wg@...ndegger.com>,
Marc Kleine-Budde <mkl@...gutronix.de>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Rob Herring <robh+dt@...nel.org>
Cc: linux-can@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
devicetree@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: can: rcar_canfd: Convert to
json-schema
> On 05/06/2021 7:55 PM Geert Uytterhoeven <geert+renesas@...der.be> wrote:
>
>
> Convert the Renesas R-Car CAN FD Controller Device Tree binding
> documentation to json-schema.
>
> Document missing properties.
> The CANFD clock needs to be configured for the maximum frequency on
> R-Car V3M and V3H, too.
> Update the example to match reality.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> I have listed Fabrizio as the maintainer, as Ramesh is no longer
> available. Fabrizio: Please scream if this is inappropriate ;-)
> ---
> .../bindings/net/can/rcar_canfd.txt | 107 ---------------
> .../bindings/net/can/renesas,rcar-canfd.yaml | 122 ++++++++++++++++++
> 2 files changed, 122 insertions(+), 107 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/net/can/rcar_canfd.txt
> create mode 100644 Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
>
> diff --git a/Documentation/devicetree/bindings/net/can/rcar_canfd.txt b/Documentation/devicetree/bindings/net/can/rcar_canfd.txt
> deleted file mode 100644
> index 248c4ed97a0a078e..0000000000000000
> --- a/Documentation/devicetree/bindings/net/can/rcar_canfd.txt
> +++ /dev/null
> @@ -1,107 +0,0 @@
> -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 and RZ/G2 compatible controllers.
> - - "renesas,r8a774a1-canfd" for R8A774A1 (RZ/G2M) compatible controller.
> - - "renesas,r8a774b1-canfd" for R8A774B1 (RZ/G2N) compatible controller.
> - - "renesas,r8a774c0-canfd" for R8A774C0 (RZ/G2E) compatible controller.
> - - "renesas,r8a774e1-canfd" for R8A774E1 (RZ/G2H) compatible controller.
> - - "renesas,r8a7795-canfd" for R8A7795 (R-Car H3) compatible controller.
> - - "renesas,r8a7796-canfd" for R8A7796 (R-Car M3-W) compatible controller.
> - - "renesas,r8a77965-canfd" for R8A77965 (R-Car M3-N) compatible controller.
> - - "renesas,r8a77970-canfd" for R8A77970 (R-Car V3M) compatible controller.
> - - "renesas,r8a77980-canfd" for R8A77980 (R-Car V3H) compatible controller.
> - - "renesas,r8a77990-canfd" for R8A77990 (R-Car E3) compatible controller.
> - - "renesas,r8a77995-canfd" for R8A77995 (R-Car D3) 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 specifiers for the Channel & Global 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 R8A774A1, R8A774B1, R8A774C0, R8A774E1, R8A7795,
> -R8A7796, R8A77965, R8A77990, and R8A77995:
> -In the denoted SoCs, 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.
> -
> -Optional property:
> -The controller can operate in either CAN FD only mode (default) or
> -Classical CAN only mode. The mode is global to both the channels. In order to
> -enable the later, define the following optional property.
> - - renesas,no-can-fd: puts the controller in Classical CAN only mode.
> -
> -Example
> --------
> -
> -SoC common .dtsi file:
> -
> - canfd: can@...c0000 {
> - 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 in Classical CAN only mode.
> -
> -&canfd {
> - pinctrl-0 = <&canfd1_pins>;
> - pinctrl-names = "default";
> - renesas,no-can-fd;
> - 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";
> - };
> -};
> diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> new file mode 100644
> index 0000000000000000..0b33ba9ccb47d1ab
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> @@ -0,0 +1,122 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/can/renesas,rcar-canfd.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas R-Car CAN FD Controller
> +
> +maintainers:
> + - Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> +
> +allOf:
> + - $ref: can-controller.yaml#
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - enum:
> + - renesas,r8a774a1-canfd # RZ/G2M
> + - renesas,r8a774b1-canfd # RZ/G2N
> + - renesas,r8a774c0-canfd # RZ/G2E
> + - renesas,r8a774e1-canfd # RZ/G2H
> + - renesas,r8a7795-canfd # R-Car H3
> + - renesas,r8a7796-canfd # R-Car M3-W
> + - renesas,r8a77965-canfd # R-Car M3-N
> + - renesas,r8a77970-canfd # R-Car V3M
> + - renesas,r8a77980-canfd # R-Car V3H
> + - renesas,r8a77990-canfd # R-Car E3
> + - renesas,r8a77995-canfd # R-Car D3
> + - const: renesas,rcar-gen3-canfd # R-Car Gen3 and RZ/G2
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + items:
> + - description: Channel interrupt
> + - description: Global interrupt
> +
> + clocks:
> + maxItems: 3
> +
> + clock-names:
> + items:
> + - const: fck
> + - const: canfd
> + - const: can_clk
> +
> + power-domains:
> + maxItems: 1
> +
> + resets:
> + maxItems: 1
> +
> + renesas,no-can-fd:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + The controller can operate in either CAN FD only mode (default) or
> + Classical CAN only mode. The mode is global to both the channels.
> + Specify this property to put the controller in Classical CAN only mode.
> +
> + assigned-clocks:
> + description:
> + Reference to the CANFD clock. The CANFD clock is a div6 clock and can be
> + used by both CAN (if present) and CAN FD controllers at the same time.
> + It needs to be scaled to maximum frequency if any of these controllers
> + use it.
> +
> + assigned-clock-rates:
> + description: Maximum frequency of the CANFD clock.
> +
> +patternProperties:
> + "^channel[01]$":
> + type: object
> + description:
> + The controller supports two channels and each is represented as a child
> + node. Each child node supports the "status" property only, which
> + is used to enable/disable the respective channel.
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - clocks
> + - clock-names
> + - power-domains
> + - resets
> + - assigned-clocks
> + - assigned-clock-rates
> + - channel0
> + - channel1
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/r8a7795-cpg-mssr.h>
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> + #include <dt-bindings/power/r8a7795-sysc.h>
> +
> + canfd: can@...c0000 {
> + compatible = "renesas,r8a7795-canfd",
> + "renesas,rcar-gen3-canfd";
> + reg = <0xe66c0000 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 = <&sysc R8A7795_PD_ALWAYS_ON>;
> + resets = <&cpg 914>;
> +
> + channel0 {
> + };
> +
> + channel1 {
> + };
> + };
> --
> 2.25.1
Reviewed-by: Ulrich Hecht <uli+renesas@...nd.eu>
CU
Uli
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