linux-kernel - Re: [PACTH v3 1/3] dt-bindings: crypto: Convert Atmel AES to yaml

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Date:   Fri, 11 Feb 2022 08:55:33 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <Tudor.Ambarus@...rochip.com>, <herbert@...dor.apana.org.au>,
        <krzysztof.kozlowski@...onical.com>, <robh+dt@...nel.org>
CC:     <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <linux-crypto@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <Kavyasree.Kotagiri@...rochip.com>,
        <devicetree@...r.kernel.org>
Subject: Re: [PACTH v3 1/3] dt-bindings: crypto: Convert Atmel AES to yaml

Hi Tudor,

On 11.02.2022 10:21, Tudor Ambarus wrote:
> Convert Atmel AES documentation to yaml format. With the conversion the
> clock and clock-names properties are made mandatory. The driver returns
> -EINVAL if "aes_clk" is not found, reflect that in the bindings and make
> the clock and clock-names properties mandatory. Update the example to
> better describe how one should define the dt node.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  .../crypto/atmel,at91sam9g46-aes.yaml         | 66 +++++++++++++++++++
>  .../bindings/crypto/atmel-crypto.txt          | 20 ------
>  2 files changed, 66 insertions(+), 20 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/crypto/atmel,at91sam9g46-aes.yaml
> 
> diff --git a/Documentation/devicetree/bindings/crypto/atmel,at91sam9g46-aes.yaml b/Documentation/devicetree/bindings/crypto/atmel,at91sam9g46-aes.yaml
> new file mode 100644
> index 000000000000..fe59ad30b171
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/crypto/atmel,at91sam9g46-aes.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/crypto/atmel,at91sam9g46-aes.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel Advanced Encryption Standard (AES) HW cryptographic accelerator
> +
> +maintainers:
> +  - Tudor Ambarus <tudor.ambarus@...rochip.com>
> +
> +properties:
> +  compatible:
> +    const: atmel,at91sam9g46-aes
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: aes_clk
> +
> +  dmas:
> +    items:
> +      - description: TX DMA Channel
> +      - description: RX DMA Channel
> +
> +  dma-names:
> +    items:
> +      - const: tx
> +      - const: rx
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - dmas
> +  - dma-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/at91.h>
> +    #include <dt-bindings/dma/at91.h>
> +
> +    aes: crypto@...38000 {

Address here        ^

> +      compatible = "atmel,at91sam9g46-aes";
> +      reg = <0xe1810000 0x100>;

and here            ^  don't match.

> +      interrupts = <GIC_SPI 27 IRQ_TYPE_LEVEL_HIGH>;
> +      clocks = <&pmc PMC_TYPE_PERIPHERAL 27>;
> +      clock-names = "aes_clk";
> +      dmas = <&dma0 AT91_XDMAC_DT_PERID(1)>,
> +             <&dma0 AT91_XDMAC_DT_PERID(2)>;
> +      dma-names = "tx", "rx";
> +    };
> diff --git a/Documentation/devicetree/bindings/crypto/atmel-crypto.txt b/Documentation/devicetree/bindings/crypto/atmel-crypto.txt
> index f2aab3dc2b52..1353ebd0dcaa 100644
> --- a/Documentation/devicetree/bindings/crypto/atmel-crypto.txt
> +++ b/Documentation/devicetree/bindings/crypto/atmel-crypto.txt
> @@ -2,26 +2,6 @@
>  
>  These are the HW cryptographic accelerators found on some Atmel products.
>  
> -* Advanced Encryption Standard (AES)
> -
> -Required properties:
> -- compatible : Should be "atmel,at91sam9g46-aes".
> -- reg: Should contain AES registers location and length.
> -- interrupts: Should contain the IRQ line for the AES.
> -- dmas: List of two DMA specifiers as described in
> -        atmel-dma.txt and dma.txt files.
> -- dma-names: Contains one identifier string for each DMA specifier
> -             in the dmas property.
> -
> -Example:
> -aes@...38000 {
> -	compatible = "atmel,at91sam9g46-aes";
> -	reg = <0xf8038000 0x100>;
> -	interrupts = <43 4 0>;
> -	dmas = <&dma1 2 18>,
> -	       <&dma1 2 19>;
> -	dma-names = "tx", "rx";
> -
>  * Triple Data Encryption Standard (Triple DES)
>  
>  Required properties: