# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/i2c/renesas,rcar-i2c.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Renesas R-Car I2C Controller
maintainers:
- Wolfram Sang <wsa+renesas@sang-engineering.com>
properties:
compatible:
oneOf:
- items:
- enum:
- renesas,i2c-r8a7778 # R-Car M1A
- renesas,i2c-r8a7779 # R-Car H1
- const: renesas,rcar-gen1-i2c # R-Car Gen1
- items:
- enum:
- renesas,i2c-r8a7742 # RZ/G1H
- renesas,i2c-r8a7743 # RZ/G1M
- renesas,i2c-r8a7744 # RZ/G1N
- renesas,i2c-r8a7745 # RZ/G1E
- renesas,i2c-r8a77470 # RZ/G1C
- renesas,i2c-r8a7790 # R-Car H2
- renesas,i2c-r8a7791 # R-Car M2-W
- renesas,i2c-r8a7792 # R-Car V2H
- renesas,i2c-r8a7793 # R-Car M2-N
- renesas,i2c-r8a7794 # R-Car E2
- const: renesas,rcar-gen2-i2c # R-Car Gen2 and RZ/G1
- items:
- enum:
- renesas,i2c-r8a774a1 # RZ/G2M
- renesas,i2c-r8a774b1 # RZ/G2N
- renesas,i2c-r8a774c0 # RZ/G2E
- renesas,i2c-r8a774e1 # RZ/G2H
- renesas,i2c-r8a7795 # R-Car H3
- renesas,i2c-r8a7796 # R-Car M3-W
- renesas,i2c-r8a77961 # R-Car M3-W+
- renesas,i2c-r8a77965 # R-Car M3-N
- renesas,i2c-r8a77970 # R-Car V3M
- renesas,i2c-r8a77980 # R-Car V3H
- renesas,i2c-r8a77990 # R-Car E3
- renesas,i2c-r8a77995 # R-Car D3
- const: renesas,rcar-gen3-i2c # R-Car Gen3 and RZ/G2
- items:
- enum:
- renesas,i2c-r8a779a0 # R-Car V3U
- renesas,i2c-r8a779f0 # R-Car S4-8
- renesas,i2c-r8a779g0 # R-Car V4H
- const: renesas,rcar-gen4-i2c # R-Car Gen4
reg:
maxItems: 1
interrupts:
maxItems: 1
clock-frequency:
description:
Desired I2C bus clock frequency in Hz. The absence of this property
indicates the default frequency 100 kHz.
clocks:
maxItems: 1
power-domains:
maxItems: 1
resets:
maxItems: 1
dmas:
minItems: 2
maxItems: 4
description:
Must contain a list of pairs of references to DMA specifiers, one for
transmission, and one for reception.
dma-names:
minItems: 2
maxItems: 4
items:
enum:
- tx
- rx
i2c-scl-falling-time-ns:
default: 35
description:
Number of nanoseconds the SCL signal takes to fall; t(f) in the I2C
specification.
i2c-scl-internal-delay-ns:
default: 50
description:
Number of nanoseconds the IP core additionally needs to setup SCL.
i2c-scl-rising-time-ns:
default: 200
description:
Number of nanoseconds the SCL signal takes to rise; t(r) in the I2C
specification.
required:
- compatible
- reg
- interrupts
- clocks
- power-domains
- '#address-cells'
- '#size-cells'
allOf:
- $ref: /schemas/i2c/i2c-controller.yaml#
- if:
properties:
compatible:
contains:
enum:
- renesas,rcar-gen1-i2c
- renesas,rcar-gen2-i2c
then:
properties:
dmas: false
dma-names: false
- if:
properties:
compatible:
contains:
enum:
- renesas,rcar-gen2-i2c
- renesas,rcar-gen3-i2c
- renesas,rcar-gen4-i2c
then:
required:
- resets
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/clock/r8a7791-cpg-mssr.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/power/r8a7791-sysc.h>
i2c0: i2c@e6508000 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "renesas,i2c-r8a7791", "renesas,rcar-gen2-i2c";
reg = <0xe6508000 0x40>;
interrupts = <GIC_SPI 287 IRQ_TYPE_LEVEL_HIGH>;
clock-frequency = <400000>;
clocks = <&cpg CPG_MOD 931>;
power-domains = <&sysc R8A7791_PD_ALWAYS_ON>;
resets = <&cpg 931>;
i2c-scl-internal-delay-ns = <6>;
};