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Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: [PATCH v8 1/6] dt-bindings: remoteproc: Add Xilinx RPU subsystem bindings Content-Language: en-US To: Rob Herring , Peter Korsgaard CC: , , , , , , , , , References: <20220602203834.3675160-1-tanmay.shah@xilinx.com> <20220602203834.3675160-2-tanmay.shah@xilinx.com> <87tu921ck6.fsf@dell.be.48ers.dk> <20220609174108.GB3996953-robh@kernel.org> From: Tanmay Shah In-Reply-To: <20220609174108.GB3996953-robh@kernel.org> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8bb77887-53cc-4cbe-b569-08da4afcbbf3 X-MS-TrafficTypeDiagnostic: MWHPR02MB2542:EE_ X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:149.199.62.198;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:xsj-pvapexch01.xlnx.xilinx.com;PTR:unknown-62-198.xilinx.com;CAT:NONE;SFS:(13230001)(4636009)(46966006)(36840700001)(40470700004)(2616005)(966005)(356005)(5660300002)(186003)(9786002)(7416002)(36860700001)(31696002)(53546011)(83380400001)(8936002)(508600001)(4326008)(8676002)(70586007)(70206006)(82310400005)(40460700003)(26005)(44832011)(336012)(47076005)(36756003)(31686004)(110136005)(426003)(54906003)(7636003)(316002)(2906002)(50156003)(43740500002);DIR:OUT;SFP:1101; X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jun 2022 16:17:37.0934 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8bb77887-53cc-4cbe-b569-08da4afcbbf3 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: SN1NAM02FT0038.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR02MB2542 X-Spam-Status: No, score=-3.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2, SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org HI Rob, Thanks for reviews. Please find my comments below. On 6/9/22 10:41 AM, Rob Herring wrote: > On Fri, Jun 03, 2022 at 08:33:13AM +0200, Peter Korsgaard wrote: >>>>>>> "Tanmay" == Tanmay Shah writes: >> Hi, >> >> > Xilinx ZynqMP platform has dual-core ARM Cortex R5 Realtime Processing >> > Unit(RPU) subsystem. This patch adds dt-bindings for RPU subsystem >> > (cluster). >> >> > Signed-off-by: Tanmay Shah >> > --- >> >> > Changes in v8: >> > - Add 'items:' for sram property >> >> > Changes in v7: >> > - Add minItems in sram property >> >> > Changes in v6: >> > - Add maxItems to sram and memory-region property >> >> > Changes in v5: >> > - Add constraints of the possible values of xlnx,cluster-mode property >> > - fix description of power-domains property for r5 core >> > - Remove reg, address-cells and size-cells properties as it is not required >> > - Fix description of mboxes property >> > - Add description of each memory-region and remove old .txt binding link >> > reference in the description >> >> > Changes in v4: >> > - Add memory-region, mboxes and mbox-names properties in example >> >> > Changes in v3: >> > - None >> >> > .../bindings/remoteproc/xlnx,r5f-rproc.yaml | 130 ++++++++++++++++++ >> > include/dt-bindings/power/xlnx-zynqmp-power.h | 6 + >> > 2 files changed, 138 insertions(+) >> > create mode 100644 Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml >> >> > diff --git a/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml >> > new file mode 100644 >> > index 000000000000..adfe05ff157a >> > --- /dev/null >> > +++ b/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml >> > @@ -0,0 +1,132 @@ >> > +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause) >> > +%YAML 1.2 >> > +--- >> > +$id: http://devicetree.org/schemas/remoteproc/xlnx,r5f-rproc.yaml# >> > +$schema: http://devicetree.org/meta-schemas/core.yaml# >> > + >> > +title: Xilinx R5F processor subsystem >> > + >> > +maintainers: >> > + - Ben Levinsky >> > + - Tanmay Shah >> > + >> > +description: | >> > + The Xilinx platforms include a pair of Cortex-R5F processors (RPU) for >> > + real-time processing based on the Cortex-R5F processor core from ARM. >> > + The Cortex-R5F processor implements the Arm v7-R architecture and includes a >> > + floating-point unit that implements the Arm VFPv3 instruction set. >> > + >> > +properties: >> > + compatible: >> > + const: xlnx,zynqmp-r5fss >> > + >> > + xlnx,cluster-mode: >> > + $ref: /schemas/types.yaml#/definitions/uint32 >> > + enum: [0, 1, 2] >> >> A textual mode ("dual", "lock-step", "single") would be more readable. >> >> >> > + description: | >> > + The RPU MPCore can operate in split mode(Dual-processor performance), Safety >> >> space missing before "(Dual-processor" >> >> >> > + lock-step mode(Both RPU cores execute the same code in lock-step, >> > + clock-for-clock) or Single CPU mode (RPU core 0 can be held in reset while >> >> "can be" sounds a bit weak, perhaps "is" >> >> >> > + core 1 runs normally). The processor does not support dynamic configuration. >> > + Switching between modes is only permitted immediately after a processor reset. >> > + If set to 1 then lockstep mode and if 0 then split mode. >> > + If set to 2 then single CPU mode. When not defined, default will be lockstep mode. >> >> This looks a bit confusing. If you decide to stick to the numerical >> modes, then at least list them in numerical order, E.G.: >> >> 0: split >> 1: lockstep >> 2: single I think the description is fine. for readability I can just add numerical order as above. > The bigger issue has been multiple Cortex-R5 bindings all doing their > own thing for this feature which is not vendor specific (except TI has > their own extra mode or something). How TCMs are described is the > other issue. I've just stopped caring because no one listens. Values used for cluster-mode property for xlnx platform is same as ti's cluster mode property. 0: split, 1: lockstep and 2: single-cpu mode. It is matching with ti,k3-r5 bindings. However, default value for some of the ti platforms are different. xlnx platforms have single-cpu mode as well. It will take some time to design system-dt spec for TCM. So, for now I use hard-code values of TCM from driver. TCM bindings for linux will be posted once system-dt spec is accepted. Meanwhile we would like to upstream rest of the bindings and driver. > >>> + >> > +patternProperties: >> > + "^r5f-[a-f0-9]+$": >> > + type: object >> > + description: | >> > + The RPU is located in the Low Power Domain of the Processor Subsystem. >> > + Each processor includes separate L1 instruction and data caches and >> > + tightly coupled memories (TCM). System memory is cacheable, but the TCM >> > + memory space is non-cacheable. >> > + >> > + Each RPU contains one 64KB memory and two 32KB memories that >> > + are accessed via the TCM A and B port interfaces, for a total of 128KB >> > + per processor. In lock-step mode, the processor has access to 256KB of >> > + TCM memory. >> > + >> > + properties: >> > + compatible: >> > + const: xlnx,zynqmp-r5f >> > + >> > + power-domains: >> > + description: RPU core PM domain specifier >> > + maxItems: 1 >> >> A bit more detail would be good, E.G. something like arm/cpus.yaml does: >> >> List of phandles and PM domain specifiers, as defined by bindings of the >> PM domain provider (see also ../power_domain.txt). >> >> And the phandle-array ref. > Both suggestions are wrong. We don't need common properties re-described > by every user. They already have a type definition too, so we don't need > to repeat phandle-array ref either. > > The existing description is not needed either as it doesn't provide any > information specific to this binding. You only need to describe each > entry when there is more than 1 entry because we need to know what each > entry is and the order. I will remove current description as well. Thanks. > >>> + >> > + mboxes: >> > + minItems: 1 >> > + items: >> > + - description: mailbox channel to send data to RPU >> > + - description: mailbox channel to receive data from RPU >> > + >> > + mbox-names: >> > + minItems: 1 >> > + items: >> > + - const: tx >> > + - const: rx >> >> And here as well for mailbox/mailbox.txt > Nope! > >> >> > + >> > + sram: >> > + $ref: /schemas/types.yaml#/definitions/phandle-array >> > + minItems: 1 >> > + maxItems: 8 >> > + items: >> > + maxItems: 1 >> > + description: | >> > + phandles to one or more reserved on-chip SRAM regions. Other than TCM, >> > + the RPU can execute instructions and access data from, the OCM memory, >> > + the main DDR memory, and other system memories. >> >> Drop the comma after "from" >> >> >> > + >> > + The regions should be defined as child nodes of the respective SRAM >> > + node, and should be defined as per the generic bindings in, >> >> Drop the comma after "in" >> >> >> > + Documentation/devicetree/bindings/sram/sram.yaml >> > + >> > + memory-region: >> > + description: | >> > + List of phandles to the reserved memory regions associated with the >> > + remoteproc device. This is variable and describes the memories shared with >> > + the remote processor (e.g. remoteproc firmware and carveouts, rpmsg >> > + vrings, ...). This reserved memory region will be allocated on DDR memory. >> >> s/on DDR/in DDR/ >> >> > + minItems: 1 >> > + maxItems: 8 >> > + items: >> > + - description: region used for RPU firmware image section >> > + - description: vdev buffer >> > + - description: vring0 >> > + - description: vring1 >> > + additionalItems: true >> > + >> > + required: >> > + - compatible >> > + - power-domains >> > + >> > + unevaluatedProperties: false >> > + >> > +required: >> > + - compatible >> > + >> > +additionalProperties: false >> > + >> > +examples: >> > + - | >> > + r5fss: r5fss { >> > + compatible = "xlnx,zynqmp-r5fss"; >> > + xlnx,cluster-mode = <1>; >> > + >> > + r5f-0 { >> > + compatible = "xlnx,zynqmp-r5f"; >> > + power-domains = <&zynqmp_firmware 0x7>; >> > + memory-region = <&rproc_0_fw_image>, <&rpu0vdev0buffer>, <&rpu0vdev0vring0>, <&rpu0vdev0vring1>; >> > + mboxes = <&ipi_mailbox_rpu0 0>, <&ipi_mailbox_rpu0 1>; >> > + mbox-names = "tx", "rx"; >> > + }; >> > + >> > + r5f-1 { >> > + compatible = "xlnx,zynqmp-r5f"; >> > + power-domains = <&zynqmp_firmware 0x8>; >> > + memory-region = <&rproc_1_fw_image>, <&rpu1vdev0buffer>, <&rpu1vdev0vring0>, <&rpu1vdev0vring1>; >> > + mboxes = <&ipi_mailbox_rpu1 0>, <&ipi_mailbox_rpu1 1>; >> > + mbox-names = "tx", "rx"; >> > + }; >> > + }; >> > +... >> > diff --git a/include/dt-bindings/power/xlnx-zynqmp-power.h b/include/dt-bindings/power/xlnx-zynqmp-power.h >> > index 0d9a412fd5e0..618024cbb20d 100644 >> > --- a/include/dt-bindings/power/xlnx-zynqmp-power.h >> > +++ b/include/dt-bindings/power/xlnx-zynqmp-power.h >> > @@ -6,6 +6,12 @@ >> > #ifndef _DT_BINDINGS_ZYNQMP_POWER_H >> > #define _DT_BINDINGS_ZYNQMP_POWER_H >> >> > +#define PD_RPU_0 7 >> > +#define PD_RPU_1 8 >> > +#define PD_R5_0_ATCM 15 >> > +#define PD_R5_0_BTCM 16 >> > +#define PD_R5_1_ATCM 17 >> > +#define PD_R5_1_BTCM 18 >> > #define PD_USB_0 22 >> > #define PD_USB_1 23 >> > #define PD_TTC_0 24 >> > -- >> >> > 2.25.1 >> >> >> -- >> Bye, Peter Korsgaard >>