linux-kernel - Re: [PATCH 03/11] dt-bindings: usb: Add binding for Cypress cypd4226 I2C driver

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Date:   Wed, 26 Oct 2022 08:13:57 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Wayne Chang <waynec@...dia.com>, gregkh@...uxfoundation.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        treding@...dia.com, thierry.reding@...il.com,
        heikki.krogerus@...ux.intel.com, ajayg@...dia.com, kishon@...com,
        vkoul@...nel.org, p.zabel@...gutronix.de, balbi@...nel.org,
        mathias.nyman@...el.com, jckuo@...dia.com
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, singhanc@...dia.com,
        linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 03/11] dt-bindings: usb: Add binding for Cypress cypd4226
 I2C driver


On 24/10/2022 08:41, Wayne Chang wrote:
> add device-tree binding documentation for Cypress cypd4226 type-C
> controller's I2C interface. It is a standard i2c slave with GPIO
> input as IRQ interface.
> 
> Signed-off-by: Wayne Chang <waynec@...dia.com>
> ---
>   .../bindings/usb/cypress,cypd4226.yaml        | 86 +++++++++++++++++++
>   1 file changed, 86 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/usb/cypress,cypd4226.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/cypress,cypd4226.yaml b/Documentation/devicetree/bindings/usb/cypress,cypd4226.yaml
> new file mode 100644
> index 000000000000..5ac28ab4e7a1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/cypress,cypd4226.yaml
> @@ -0,0 +1,86 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/cypress,cypd4226.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cypress cypd4226 UCSI I2C Type-C Controller
> +
> +maintainers:
> +  - Wayne Chang <waynec@...dia.com>
> +
> +description: |
> +  The Cypress cypd4226 UCSI I2C type-C controller is a I2C interface type-C
> +  controller.
> +
> +properties:
> +  compatible:
> +    const: cypress,cypd4226
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  reg:
> +    const: 0x08
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  cypress,firmware-build:
> +    enum:
> +      - nv
> +      - gn
> +    description: |
> +      the name of the CCGx firmware built for product series.
> +      should be set one of following:
> +      - "nv" for the RTX product series

Please add 'NVIDIA' so that it is 'for the NVIDIA RTX product series'

> +      - "gn" for the Jetson product series

Same here please add 'NVIDIA' so that it is 'for the NVIDIA Jetson 
product series'.

Rob, any concerns about this property in general? Unfortunately, ACPI 
choose a 16-bit type for this and used 'nv' for the RTX product. I don't 
find 'gn' for Jetson very descriptive but we need a way to differentiate 
from RTX.

This is needed in the Cypress CCGX driver for the following ...

https://lore.kernel.org/lkml/20220928150840.3804313-1-waynec@nvidia.com/

Ideally, this should have been included in this series but was sent 
before. We can always re-work/update the above patch even though it has 
been queued up now.

Jon

-- 
nvpublic