linux-kernel - Re: [PATCH 1/4] dt-bindings: usb: atmel,at91rm9200-ohci: convert to DT schema

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Message-ID: <7bb66a07-51c5-4e9a-b484-e96a8f12c783@gmail.com>
Date: Wed, 4 Feb 2026 18:45:00 +0530
From: Charan Pedumuru <charan.pedumuru@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Claudiu Beznea
 <claudiu.beznea@...on.dev>, Herve Codina <herve.codina@...tlin.com>,
 Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: usb: atmel,at91rm9200-ohci: convert to
 DT schema



On 01-02-2026 17:04, Charan Pedumuru wrote:
> Convert Atmel AT91RM9200 / AT91SAM9 style OHCI USB Host
> Controller binding to DT schema.
> Changes during conversion:
> - Include "usb-ohci" as a fallback compatible to allow at91 OHCI
>   driver matching.
> 
> Signed-off-by: Charan Pedumuru <charan.pedumuru@...il.com>
> ---
>  .../bindings/usb/atmel,at91rm9200-ohci.yaml        | 85 ++++++++++++++++++++++
>  1 file changed, 85 insertions(+)

Hi Rob,

For this patch, can I modify the existing generic-ohci.yaml file to include the compatible "atmel,at91rm9200-ohci" to it and define missing properties, as the fall back compatible "usb-ohci" is already defined for other vendors there, can I drop this patch and make changes for generic-ohci.yaml file and include it in the patch series for the next revision?

> 
> diff --git a/Documentation/devicetree/bindings/usb/atmel,at91rm9200-ohci.yaml b/Documentation/devicetree/bindings/usb/atmel,at91rm9200-ohci.yaml
> new file mode 100644
> index 000000000000..f04de6d553d2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/atmel,at91rm9200-ohci.yaml
> @@ -0,0 +1,85 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/atmel,at91rm9200-ohci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel AT91RM9200 / AT91SAM9 style OHCI USB Host Controller
> +
> +maintainers:
> +  - Nicolas Ferre <nicolas.ferre@...rochip.com>
> +  - Alexandre Belloni <alexandre.belloni@...tlin.com>
> +
> +description:
> +  The Atmel AT91RM9200 / AT91SAM9 OHCI USB Host Controller implements a
> +  USB 1.1 Open Host Controller Interface (OHCI) compliant host interface.
> +  It provides low-speed and full-speed USB host functionality and is
> +  integrated into Atmel AT91RM9200 and AT91SAM9 family SoCs.
> +
> +allOf:
> +  - $ref: /schemas/usb/usb.yaml#
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - const: atmel,at91rm9200-ohci
> +          - const: usb-ohci
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 3
> +    maxItems: 3
> +
> +  clock-names:
> +    items:
> +      - const: ohci_clk
> +      - const: hclk
> +      - const: uhpck
> +
> +  num-ports:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Number of downstream ports supported by this OHCI controller
> +    minimum: 1
> +    maximum: 15
> +
> +  atmel,vbus-gpio:
> +    description: GPIO used to control or sense the USB VBUS power.
> +    minItems: 1
> +    maxItems: 3
> +
> +  atmel,oc-gpio:
> +    description: GPIO used to signal USB overcurrent condition.
> +    minItems: 1
> +    maxItems: 3
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/at91.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    usb@...000 {
> +        compatible = "atmel,at91rm9200-ohci", "usb-ohci";
> +        reg = <0x500000 0x100000>;
> +        interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&uhphs_clk>, <&uhphs_clk>, <&uhpck>;
> +        clock-names = "ohci_clk", "hclk", "uhpck";
> +        atmel,vbus-gpio = <&pioA 18 GPIO_ACTIVE_HIGH>;
> +        atmel,oc-gpio   = <&pioB 10 GPIO_ACTIVE_LOW>;
> +        num-ports = <2>;
> +    };
> +...
> 

-- 
Best Regards,
Charan.