linux-kernel - Re: [PATCH 1/3] dt-bindings: iommu: rockchip: Convert IOMMU to DT schema

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Message-ID: <c2087946-0dfb-b66e-bcb9-5bba5fd098bf@gmail.com>
Date:   Thu, 22 Apr 2021 15:13:38 +0200
From:   Johan Jonker <jbx6244@...il.com>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        joro@...tes.org, will@...nel.org, robh+dt@...nel.org,
        heiko@...ech.de, xxm@...k-chips.com
Cc:     iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH 1/3] dt-bindings: iommu: rockchip: Convert IOMMU to DT
 schema

Hi Benjamin,

Please check robh/dtbs-check failed build log at

https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20210422072442.111070-2-benjamin.gaignard@collabora.com/

make ARCH=arm64 dt_binding_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml


make ARCH=arm dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml

make ARCH=arm64 dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml

Test if all notifications are gone.

===

YAML also checks extra properties like "power-domains" not yet included
but needed for rk3568.
Add them in a separate patch.

===

rk3229-evb.dt.yaml: iommu@...30480: 'iommu-cells' does not match any of
the regexes

Change a rk322x.dtsi property to #iommu-cells in a separate patch.

===

rk3229-xms6.dt.yaml: iommu@...30480: reg: [[537068672, 64], [537068736,
64]] is too long

Change reg minItems maxItems.

===

Johan

On 4/22/21 9:24 AM, Benjamin Gaignard wrote:
> Convert Rockchip IOMMU to DT schema
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
>  .../bindings/iommu/rockchip,iommu.txt         | 38 ----------
>  .../bindings/iommu/rockchip,iommu.yaml        | 76 +++++++++++++++++++
>  2 files changed, 76 insertions(+), 38 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
>  create mode 100644 Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt b/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
> deleted file mode 100644
> index 6ecefea1c6f9..000000000000
> --- a/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
> +++ /dev/null
> @@ -1,38 +0,0 @@
> -Rockchip IOMMU
> -==============
> -
> -A Rockchip DRM iommu translates io virtual addresses to physical addresses for
> -its master device.  Each slave device is bound to a single master device, and
> -shares its clocks, power domain and irq.
> -
> -Required properties:
> -- compatible      : Should be "rockchip,iommu"
> -- reg             : Address space for the configuration registers
> -- interrupts      : Interrupt specifier for the IOMMU instance
> -- interrupt-names : Interrupt name for the IOMMU instance
> -- #iommu-cells    : Should be <0>.  This indicates the iommu is a
> -                    "single-master" device, and needs no additional information
> -                    to associate with its master device.  See:
> -                    Documentation/devicetree/bindings/iommu/iommu.txt
> -- clocks          : A list of clocks required for the IOMMU to be accessible by
> -                    the host CPU.
> -- clock-names     : Should contain the following:
> -	"iface" - Main peripheral bus clock (PCLK/HCL) (required)
> -	"aclk"  - AXI bus clock (required)
> -
> -Optional properties:
> -- rockchip,disable-mmu-reset : Don't use the mmu reset operation.
> -			       Some mmu instances may produce unexpected results
> -			       when the reset operation is used.
> -
> -Example:
> -
> -	vopl_mmu: iommu@...40300 {
> -		compatible = "rockchip,iommu";
> -		reg = <0xff940300 0x100>;
> -		interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
> -		interrupt-names = "vopl_mmu";
> -		clocks = <&cru ACLK_VOP1>, <&cru HCLK_VOP1>;
> -		clock-names = "aclk", "iface";
> -		#iommu-cells = <0>;
> -	};
> diff --git a/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml b/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> new file mode 100644
> index 000000000000..ab128f8e4c73
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> @@ -0,0 +1,76 @@

> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

GPL-2.0
This is a conversion of an existing document.

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iommu/rockchip,iommu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip IOMMU
> +
> +maintainers:
> +  - Simon Xue <xxm@...k-chips.com>

  - Heiko Stuebner <heiko@...ech.de>

Add someone that can respond in a short time in case rob+dt wants to
delete something.

> +
> +description: |+
> +  A Rockchip DRM iommu translates io virtual addresses to physical addresses for

> +  its master device. Each slave device is bound to a single master device, and

No comma "," before "and"

> +  shares its clocks, power domain and irq.
> +
> +  For information on assigning IOMMU controller to its peripheral devices,
> +  see generic IOMMU bindings.
> +
> +properties:
> +  compatible:
> +    const: rockchip,iommu
> +
> +  reg:

> +    maxItems: 1

minItems: 1
maxItems: 2


> +
> +  interrupts:
> +    maxItems: 1
> +
> +  interrupt-names:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Core clock
> +      - description: Interface clock
> +
> +  clock-names:
> +    items:
> +      - const: aclk
> +      - const: iface
> +
> +  "#iommu-cells":
> +    const: 0
> +

  power-domains:
    maxItems: 1

Add in separate patch for review by rob+bt

> +  rockchip,disable-mmu-reset:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |

> +      Don't use the mmu reset operation.

Do not use ....

The use of "'" in a YAML description gives problems in some text
highlighters. Try to avoid.

> +      Some mmu instances may produce unexpected results
> +      when the reset operation is used.
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - "#iommu-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/rk3399-cru.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    vopl_mmu: iommu@...40300 {
> +      compatible = "rockchip,iommu";
> +      reg = <0xff940300 0x100>;
> +      interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
> +      interrupt-names = "vopl_mmu";
> +      clocks = <&cru ACLK_VOP1>, <&cru HCLK_VOP1>;
> +      clock-names = "aclk", "iface";
> +      #iommu-cells = <0>;
> +    };
>