linux-kernel - Re: [Patch v5 6/9] dt-bindings: arm: tegra: Add NVIDIA Tegra234 CBB2.0 binding

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Date:   Wed, 11 May 2022 21:44:33 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     Rob Herring <robh@...nel.org>
CC:     <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <kbuild-all@...ts.01.org>,
        <bbasu@...dia.com>, <vsethi@...dia.com>, <jsequeira@...dia.com>,
        Sumit Gupta <sumitg@...dia.com>
Subject: Re: [Patch v5 6/9] dt-bindings: arm: tegra: Add NVIDIA Tegra234
 CBB2.0 binding



On 11/05/22 20:19, Rob Herring wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Fri, May 06, 2022 at 04:42:14PM +0530, Sumit Gupta wrote:
>> Add device-tree binding documentation to represent CBB2.0 (Control
>> Backbone) error handling driver. The driver prints debug information
>> about failed transaction on receiving interrupt from CBB2.0.
> 
> Same issues in this one that I won't repeat...
Will send v6 with the changes.

> 
>>
>> Signed-off-by: Sumit Gupta <sumitg@...dia.com>
>> ---
>>   .../arm/tegra/nvidia,tegra234-cbb.yaml        | 70 +++++++++++++++++++
>>   1 file changed, 70 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/arm/tegra/nvidia,tegra234-cbb.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra234-cbb.yaml b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra234-cbb.yaml
>> new file mode 100644
>> index 000000000000..fa4383be19d8
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra234-cbb.yaml
>> @@ -0,0 +1,70 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/arm/tegra/nvidia,tegra234-cbb.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: NVIDIA Tegra CBB 2.0 Error handling driver device tree bindings
>> +
>> +maintainers:
>> +  - Sumit Gupta <sumitg@...dia.com>
>> +
>> +description: |+
>> +  The Control Backbone (CBB) is comprised of the physical path from an initiator to a target's
>> +  register configuration space. CBB 2.0 consists of multiple sub-blocks connected to each other
>> +  to create a topology. The Tegra234 SoC has different fabrics based on CBB2.0 architecture which
>> +  include cluster fabrics BPMP, AON, PSC, SCE, RCE, DCE, FSI and "CBB central fabric".
>> +
>> +  In CBB 2.0, each initiator which can issue transactions connects to a Root Master Node (MN)
>> +  before it connects to any other element of the fabric. Each Root MN contains a Error Monitor
>> +  (EM) which detects and logs error. Interrupts from various EM blocks are collated by Error
>> +  Notifier (EN) which is per fabric and presents a single interrupt from fabric to the SoC
>> +  interrupt controller.
>> +
>> +  The driver handles errors from CBB due to illegal register accesses and prints debug information
>> +  about failed transaction on receiving the interrupt from EN. Debug information includes Error
>> +  Code, Error Description, MasterID, Fabric, SlaveID, Address, Cache, Protection, Security Group
>> +  etc on receiving error notification.
>> +
>> +  If the Error Response Disable (ERD) is set/enabled for an initiator, then SError or Data abort
>> +  exception error response is masked and an interrupt is used for reporting errors due to illegal
>> +  accesses from that initiator. The value returned on read failures is '0xFFFFFFFF' for
>> +  compatibility with PCIE.
>> +
>> +properties:
>> +  $nodename:
>> +    pattern: "^[a-z]+-fabric@[0-9a-f]+$"
>> +
>> +  compatible:
>> +    enum:
>> +      - nvidia,tegra234-aon-fabric
>> +      - nvidia,tegra234-bpmp-fabric
>> +      - nvidia,tegra234-cbb-fabric
>> +      - nvidia,tegra234-dce-fabric
>> +      - nvidia,tegra234-rce-fabric
>> +      - nvidia,tegra234-sce-fabric
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    items:
>> +      - description: secure interrupt from error notifier
>> +
>> +additionalProperties: true
> 
> True is only allowed for common bindings included in other bindings.
Ok, will mark as false.

> 
> 
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +    cbb-fabric@...0000 {
>> +      compatible = "nvidia,tegra234-cbb-fabric";
>> +      reg = <0x13a00000 0x400000>;
>> +      interrupts = <GIC_SPI 231 IRQ_TYPE_LEVEL_HIGH>;
>> +      status = "okay";
>> +    };
>> --
>> 2.17.1
>>
>>