Re: [PATCH 2/3] iommu: bindings: Add binding documentation for Toshiba Visconti5 IOMMU device

Rob Herring
2022-06-02T13:44:00Z

On Wed, May 25, 2022 at 10:31:46AM +0900, Nobuhiro Iwamatsu wrote:
> Add documentation for the binding of Toshiba Visconti5 SoC's IOMMU.
>
> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
> ---
> .../bindings/iommu/toshiba,visconti-atu.yaml | 62 +++++++++++++++++++
> 1 file changed, 62 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iommu/toshiba,visconti-atu.yaml
>
> diff --git a/Documentation/devicetree/bindings/iommu/toshiba,visconti-atu.yaml b/Documentation/devicetree/bindings/iommu/toshiba,visconti-atu.yaml
> new file mode 100644
> index 000000000000..af8d6688fa70
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iommu/toshiba,visconti-atu.yaml
> @@ -0,0 +1,62 @@
> +# SPDX-License-Identifier: GPL-2.0-only

Dual license: GPL-2.0-only OR BSD-2-Clause

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iommu/toshiba,visconti-atu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Toshiba ARM SoC Visconti5 IOMMU (ATU)
> +
> +maintainers:
> + - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
> +
> +description: |+
> + IOMMU (ATU) driver can bse used for Visconti5's multimedia IPs, such as

Bindings are for hardware, not drivers.

> + DCNN (Deep Convolutional Neural Network), VIIF(Video Input), VOIF(Video
> + output), and others.
> +
> +properties:
> + compatible:
> + const: toshiba,visconti-atu
> +
> + reg:
> + maxItems: 1
> +
> + "#iommu-cells":
> + const: 0
> +
> + toshiba,max-entry:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: The size of entry for address
> + enum:
> + - 16
> + - 32
> +
> + toshiba,reserved-entry:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: The reserve number of entry address.
> + default: 0
> + minimum: 0
> + maximum: 32

These 2 need a better description of what they are for.

> +
> +required:
> + - compatible
> + - reg
> + - "#iommu-cells"
> + - toshiba,max-entry
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + soc {
> + #address-cells = <2>;
> + #size-cells = <2>;
> +
> + atu_affine0: iommu@1400f000 {

Drop unused labels.

> + compatible = "toshiba,visconti-atu";
> + reg = <0 0x1400F000 0 0x1000>;
> + toshiba,max-entry = <16>;
> + toshiba,reserved-entry = <1>;
> + #iommu-cells = <0>;
> + };
> + };
> --
> 2.36.0
>
>
>