Re: [PATCH v2 1/4] dt-bindings: crypto: rockchip: Add RK356x/RK3588 crypto engine binding

[Sebastian Reichel <sebastian.reichel@collabora.com>]

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Hi,

On Wed, Jul 08, 2026 at 06:58:22PM +0100, Dawid Olesinski wrote:
> Add a YAML device tree binding for the Rockchip second-generation (V2)
> cryptographic hardware accelerator present on the RK3568 and RK3588 SoCs.
> 
> The IP block exposes AES-ECB, AES-CBC, AES-XTS block ciphers, SHA-1,
> SHA-224, SHA-256, SHA-384, SHA-512, MD5, and SM3 hash algorithms, each
> with a hardware DMA engine controlled via linked-list descriptors.
> 
> The binding covers two compatible strings:
> 
>   - rockchip,rk3568-crypto: clocks and resets are driven directly by the
>     non-secure CRU (accessible to Linux at EL1).
>   - rockchip,rk3588-crypto: clocks and resets live in SECURECRU, a
>     register bank sandboxed to TrustZone. Linux must request them through
>     the ARM SCMI firmware interface (scmi_clk / scmi_reset), as direct
>     MMIO access to SECURECRU from EL1 triggers a bus fault.

Looking at the driver, the two implementations are compatible. The
clocks/reset line source being different is not a reason for not
being compatible. So the binding should look like this:

  compatible:
    oneOf:
      - const: rockchip,rk3568-crypto
      - items:
          - enum:
              - rockchip,rk3588-crypto
          - const: rockchip,rk3568-crypto

and then in the RK3588 DTS, use

compatible = "rockchip,rk3588-crypto", "rockchip,rk3568-crypto";

finally in the driver only bind against "rockchip,rk3568-crypto".
The RK3588 specific binding is only added in case a difference
requiring custom RK3588 quirks is found in the future.

Greetings,

-- Sebastian

> Signed-off-by: Dawid Olesinski <dawidro@gmail.com>
> ---
>  .../crypto/rockchip,rk3588-crypto.yaml        | 75 +++++++++++++++++++
>  1 file changed, 75 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/crypto/rockchip,rk3588-crypto.yaml
> 
> diff --git a/Documentation/devicetree/bindings/crypto/rockchip,rk3588-crypto.yaml b/Documentation/devicetree/bindings/crypto/rockchip,rk3588-crypto.yaml
> new file mode 100644
> index 000000000000..fc09f21b0654
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/crypto/rockchip,rk3588-crypto.yaml
> @@ -0,0 +1,75 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/crypto/rockchip,rk3588-crypto.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip cryptographic offloader
> +
> +maintainers:
> +  - Heiko Stuebner <heiko@sntech.de>
> +  - Corentin Labbe <clabbe@baylibre.com>
> +  - Dawid Olesinski <dawidro@gmail.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - rockchip,rk3568-crypto
> +      - rockchip,rk3588-crypto
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Core clock for the crypto IP internal logic
> +      - description: AXI interconnect clock interface
> +      - description: AHB interface clock
> +
> +  clock-names:
> +    items:
> +      - const: core
> +      - const: aclk
> +      - const: hclk
> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    items:
> +      - const: core
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/rockchip,rk3588-cru.h>
> +    #include <dt-bindings/reset/rockchip,rk3588-cru.h>
> +
> +    bus {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      crypto@fe370000 {
> +        compatible = "rockchip,rk3588-crypto";
> +        reg = <0x0 0xfe370000 0x0 0x2000>;
> +        interrupts = <GIC_SPI 209 IRQ_TYPE_LEVEL_HIGH 0>;
> +        clocks = <&scmi_clk SCMI_CRYPTO_CORE>, <&scmi_clk SCMI_ACLK_SECURE_NS>,
> +                 <&scmi_clk SCMI_HCLK_SECURE_NS>;
> +        clock-names = "core", "aclk", "hclk";
> +        resets = <&scmi_reset SCMI_SRST_CRYPTO_CORE>;
> +        reset-names = "core";
> +        };
> +    };
> -- 
> 2.47.3
> 
> 

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