[PATCH 2/6] dt-bindings: i2c: renesas,riic: Document RZ/T2H support

Prabhakar
2025-05-30T14:31:49Z

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Document support for the I2C Bus Interface (RIIC) found on the Renesas
RZ/T2H (R9A09G077) SoC. The RIIC IP on this SoC is similar to that on
the RZ/V2H(P) SoC but supports fewer interrupts, lacks FM+ support and
does not require resets. Due to these differences, add a new compatible
string `renesas,riic-r9a09g077` for the RZ/T2H SoC.

Unlike earlier SoCs that use eight distinct interrupts, the RZ/T2H uses
only four, including a combined error/event interrupt. Update the binding
schema to reflect this interrupt layout and skip the `resets` property
check, as it is not required on these SoCs.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
.../devicetree/bindings/i2c/renesas,riic.yaml | 71 ++++++++++++++-----
1 file changed, 52 insertions(+), 19 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/renesas,riic.yaml b/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
index bfcc400655dc..d2b11a702be0 100644
--- a/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
+++ b/Documentation/devicetree/bindings/i2c/renesas,riic.yaml
@@ -29,32 +29,46 @@ properties:
- renesas,riic-r9a09g056 # RZ/V2N
- const: renesas,riic-r9a09g057 # RZ/V2H(P)

- - const: renesas,riic-r9a09g057 # RZ/V2H(P)
+ - enum:
+ - renesas,riic-r9a09g057 # RZ/V2H(P)
+ - renesas,riic-r9a09g077 # RZ/T2H

reg:
maxItems: 1

interrupts:
- items:
- - description: Transmit End Interrupt
- - description: Receive Data Full Interrupt
- - description: Transmit Data Empty Interrupt
- - description: Stop Condition Detection Interrupt
- - description: Start Condition Detection Interrupt
- - description: NACK Reception Interrupt
- - description: Arbitration-Lost Interrupt
- - description: Timeout Interrupt
+ oneOf:
+ - items:
+ - description: Transmit End Interrupt
+ - description: Receive Data Full Interrupt
+ - description: Transmit Data Empty Interrupt
+ - description: Stop Condition Detection Interrupt
+ - description: Start Condition Detection Interrupt
+ - description: NACK Reception Interrupt
+ - description: Arbitration-Lost Interrupt
+ - description: Timeout Interrupt
+ - items:
+ - description: Transmit End Interrupt
+ - description: Receive Data Full Interrupt
+ - description: Transmit Data Empty Interrupt
+ - description: Transmit error or event Interrupt

interrupt-names:
- items:
- - const: tei
- - const: ri
- - const: ti
- - const: spi
- - const: sti
- - const: naki
- - const: ali
- - const: tmoi
+ oneOf:
+ - items:
+ - const: tei
+ - const: ri
+ - const: ti
+ - const: spi
+ - const: sti
+ - const: naki
+ - const: ali
+ - const: tmoi
+ - items:
+ - const: tei
+ - const: ri
+ - const: ti
+ - const: eei

clock-frequency:
description:
@@ -84,6 +98,25 @@ required:
allOf:
- $ref: /schemas/i2c/i2c-controller.yaml#

+ - if:
+ properties:
+ compatible:
+ contains:
+ const: renesas,riic-r9a09g077
+ then:
+ properties:
+ interrupts:
+ maxItems: 4
+ interrupt-names:
+ maxItems: 4
+ resets: false
+ else:
+ properties:
+ interrupts:
+ minItems: 8
+ interrupt-names:
+ minItems: 8
+
- if:
properties:
compatible:
--
2.49.0