Add device-tree binding documentation to represent the Control Backbone (CBB) version 1.0 used in Tegra194 SOC. Signed-off-by: Sumit Gupta <sumitg@xxxxxxxxxx> --- .../arm/tegra/nvidia,tegra194-cbb.yaml | 98 +++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/tegra/nvidia,tegra194-cbb.yaml diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra194-cbb.yaml b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra194-cbb.yaml new file mode 100644 index 000000000000..f967b45e83d5 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra194-cbb.yaml @@ -0,0 +1,98 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/arm/tegra/nvidia,tegra194-cbb.yaml#"; +$schema: "http://devicetree.org/meta-schemas/core.yaml#"; + +title: NVIDIA Tegra194 CBB 1.0 bindings + +maintainers: + - Sumit Gupta <sumitg@xxxxxxxxxx> + +description: |+ + The Control Backbone (CBB) is comprised of the physical path from an + initiator to a target's register configuration space. CBB 1.0 has + multiple hierarchical sub-NOCs (Network-on-Chip) and connects various + initiators and targets using different bridges like AXIP2P, AXI2APB. + + This driver handles errors due to illegal register accesses reported + by the NOCs inside the CBB. NOCs reporting errors are cluster NOCs + "AON-NOC, SCE-NOC, RCE-NOC, BPMP-NOC, CV-NOC" and "CBB Central NOC" + which is the main NOC. + + By default, the access issuing initiator is informed about the error + using SError or Data Abort exception unless the ERD (Error Response + Disable) is enabled/set for that initiator. If the ERD is enabled, then + SError or Data Abort is masked and the error is reported with interrupt. + + - For CCPLEX (CPU Complex) initiator, the driver sets ERD bit. So, the + errors due to illegal accesses from CCPLEX are reported by interrupts. + If ERD is not set, then error is reported by SError. + - For other initiators, the ERD is disabled. So, the access issuing + initiator is informed about the illegal access by Data Abort exception. + In addition, an interrupt is also generated to CCPLEX. These initiators + include all engines using Cortex-R5 (which is ARMv7 CPU cluster) and + engines like TSEC (Security co-processor), NVDEC (NVIDIA Video Decoder + engine) etc which can initiate transactions. + + The driver prints relevant debug information like Error Code, Error + Description, Master, Address, AXI ID, Cache, Protection, Security Group + etc on receiving error notification. + +properties: + $nodename: + pattern: "^[a-z]+-noc@[0-9a-f]+$" + + compatible: + enum: + - nvidia,tegra194-cbb-noc + - nvidia,tegra194-aon-noc + - nvidia,tegra194-bpmp-noc + - nvidia,tegra194-rce-noc + - nvidia,tegra194-sce-noc + + reg: + maxItems: 1 + + interrupts: + description: + CCPLEX receives secure or nonsecure interrupt depending on error type. + A secure interrupt is received for SEC(firewall) & SLV errors and a + non-secure interrupt is received for TMO & DEC errors. + items: + - description: non-secure interrupt + - description: secure interrupt + + nvidia,axi2apb: + $ref: '/schemas/types.yaml#/definitions/phandle' + description: + Specifies the node having all axi2apb bridges which need to be checked + for any error logged in their status register. + + nvidia,apbmisc: + $ref: '/schemas/types.yaml#/definitions/phandle' + description: + Specifies the apbmisc node which need to be used for reading the ERD + register. + +additionalProperties: false + +required: + - compatible + - reg + - interrupts + - nvidia,axi2apb + - nvidia,apbmisc + +examples: + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + + cbb-noc@2300000 { + compatible = "nvidia,tegra194-cbb-noc"; + reg = <0x02300000 0x1000>; + interrupts = <GIC_SPI 230 IRQ_TYPE_LEVEL_HIGH>, + <GIC_SPI 231 IRQ_TYPE_LEVEL_HIGH>; + nvidia,axi2apb = <&axi2apb>; + nvidia,apbmisc = <&apbmisc>; + }; -- 2.17.1
