linux-kernel - Re: [PATCH v2 1/2] dt-bindings: devapc: add bindings for mtk-devapc

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Message-ID: <a0a58181-525c-f7a3-4385-d778a113d60c@gmail.com>
Date:   Fri, 10 Jul 2020 12:41:56 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Neal Liu <neal.liu@...iatek.com>, Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        lkml <linux-kernel@...r.kernel.org>, wsd_upstream@...iatek.com
Subject: Re: [PATCH v2 1/2] dt-bindings: devapc: add bindings for mtk-devapc



On 09/07/2020 11:12, Neal Liu wrote:
> Add bindings for mtk-devapc.
> 
> Signed-off-by: Neal Liu <neal.liu@...iatek.com>
> ---
>   .../devicetree/bindings/soc/mediatek/devapc.yaml   |   82 ++++++++++++++++++++
>   1 file changed, 82 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/soc/mediatek/devapc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/mediatek/devapc.yaml b/Documentation/devicetree/bindings/soc/mediatek/devapc.yaml
> new file mode 100644
> index 0000000..f08243e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/mediatek/devapc.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# # Copyright 2020 MediaTek Inc.
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/soc/mediatek/devapc.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: MediaTek Device Access Permission Control driver
> +
> +description: |
> +  MediaTek bus fabric provides TrustZone security support and data
> +  protection to prevent slaves from being accessed by unexpected masters.
> +  The security violation is logged and sent to the processor for further
> +  analysis and countermeasures.
> +
> +maintainers:
> +  - Neal Liu <neal.liu@...iatek.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt6779-devapc
> +
> +  reg:
> +    description: The base address of devapc register bank
> +    maxItems: 1
> +
> +  interrupts:
> +    description: A single interrupt specifier
> +    maxItems: 1
> +
> +  clocks:
> +    description: Contains module clock source and clock names
> +    maxItems: 1
> +
> +  clock-names:
> +    description: Names of the clocks list in clocks property
> +    maxItems: 1
> +
> +  mediatek-slv_type_num:
> +    description: Numbers of slave type in mediatek platform
> +    maxItems: 1

This should go in the DT data, have a look for example at:
https://elixir.bootlin.com/linux/latest/source/drivers/soc/mediatek/mtk-pmic-wrap.c#L1842
and
https://elixir.bootlin.com/linux/latest/source/drivers/soc/mediatek/mtk-pmic-wrap.c#L1777

> +
> +  mediatek-vio_dbgs:
> +    description: The mask bit and start bit of devapc violation debug registers
> +    maxItems: 5
> +

same here

> +  mediatek-pds_offset:
> +    description: The offset of devapc pds registers
> +    maxItems: 1

same here

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - mediatek-slv_type_num
> +  - mediatek-vio_dbgs
> +  - mediatek-pds_offset
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/mt6779-clk.h>
> +
> +    devapc: devapc@...07000 {
> +      compatible = "mediatek,mt6779-devapc";
> +      reg = <0x10207000 0x1000>;
> +      interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_LOW>;
> +      clocks = <&infracfg_ao CLK_INFRA_DEVICE_APC>;
> +      clock-names = "devapc-infra-clock";
> +
> +      mediatek-slv_type_num = /bits/ 8 <1>;
> +      mediatek-vio_dbgs = <0x0000FFFF 0x0>,
> +                          <0x003F0000 0x10>,
> +                          <0x00400000 0x16>,
> +                          <0x00800000 0x17>,
> +                          <0x0F000000 0x18>;
> +      mediatek-pds_offset = <0x0 0x400 0x900 0x904
> +                             0xF00 0xF10 0xF14 0xF20>;
> +    };
>