linux-kernel - Re: [PATCH v10 2/4] dt-bindings: remoteproc: add Tightly Coupled Memory (TCM) bindings

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Date: Tue, 13 Feb 2024 14:37:49 -0600
From: Tanmay Shah <tanmay.shah@....com>
To: Rob Herring <robh@...nel.org>
Cc: andersson@...nel.org, robh+dt@...nel.org, devicetree@...r.kernel.org,
 krzysztof.kozlowski+dt@...aro.org, linux-remoteproc@...r.kernel.org,
 michal.simek@....com, Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
 ben.levinsky@....com, linux-kernel@...r.kernel.org,
 mathieu.poirier@...aro.org, conor+dt@...nel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v10 2/4] dt-bindings: remoteproc: add Tightly Coupled
 Memory (TCM) bindings

Hello,

Thanks for reviews please find my comments below.

On 2/13/24 1:20 PM, Rob Herring wrote:
> On Tue, 13 Feb 2024 09:54:48 -0800, Tanmay Shah wrote:
> > From: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> > 
> > Introduce bindings for TCM memory address space on AMD-xilinx Zynq
> > UltraScale+ platform. It will help in defining TCM in device-tree
> > and make it's access platform agnostic and data-driven.
> > 
> > Tightly-coupled memories(TCMs) are low-latency memory that provides
> > predictable instruction execution and predictable data load/store
> > timing. Each Cortex-R5F processor contains two 64-bit wide 64 KB memory
> > banks on the ATCM and BTCM ports, for a total of 128 KB of memory.
> > 
> > The TCM resources(reg, reg-names and power-domain) are documented for
> > each TCM in the R5 node. The reg and reg-names are made as required
> > properties as we don't want to hardcode TCM addresses for future
> > platforms and for zu+ legacy implementation will ensure that the
> > old dts w/o reg/reg-names works and stable ABI is maintained.
> > 
> > It also extends the examples for TCM split and lockstep modes.
> > 
> > Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> > Signed-off-by: Tanmay Shah <tanmay.shah@....com>
> > ---
> > 
> > Changes in v10:
> >   - modify number of "reg", "reg-names" and "power-domains" entries
> >     based on cluster mode
> >   - Add extra optional atcm and btcm in "reg" property for lockstep mode
> >   - Add "reg-names" for extra optional atcm and btcm for lockstep mode
> >   - Drop previous Ack as bindings has new change
> > 
> > Changes in v9:
> >   - None
> > Changes in v8:
> >   - None
> > Changes in v7:
> >   - None
> > Changes in v6:
> >   - None
> > Changes in v5:
> >   - None
> > 
> > Changes in v4:
> >   - Use address-cells and size-cells value 2
> >   - Modify ranges property as per new value of address-cells
> >     and size-cells
> >   - Modify child node "reg" property accordingly
> >   - Remove previous ack for further review
> > 
> > v4 link: https://lore.kernel.org/all/20230829181900.2561194-2-tanmay.shah@amd.com/
> > 
> >  .../remoteproc/xlnx,zynqmp-r5fss.yaml         | 192 ++++++++++++++++--
> >  1 file changed, 170 insertions(+), 22 deletions(-)
> > 
>
> My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
> on your patch (DT_CHECKER_FLAGS is new in v5.13):
>
> yamllint warnings/errors:
> ./Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml:118:13: [warning] wrong indentation: expected 10 but found 12 (indentation)
Ack. I will fix this.

However, can I still get reviews on patch itself so if something else needs to be fixed I can fix in next revision as well.

Also, I tried to run yamllint with following command:

make DT_CHECKER_FLAGS=-m dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml O=../build/zynqmp/linux-next/


However, I see following logs without any error on bindings:

  LINT    Documentation/devicetree/bindings
invalid config: unknown option "required" for rule "quoted-strings"
*xargs: /usr/bin/yamllint: exited with status 255; aborting*
  CHKDT   Documentation/devicetree/bindings/processed-schema.json
  SCHEMA  Documentation/devicetree/bindings/processed-schema.json
  DTEX    Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.example.dts
  DTC_CHK Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.example.dtb

I am not sure if my system is missing something but, yamllint tool is failing.

I appreciate if someone can point to quick fix if this is known issue and is already resolved.

Thanks,

Tanmay

> dtschema/dtc warnings/errors:
>
> doc reference errors (make refcheckdocs):
>
> See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20240213175450.3097308-3-tanmay.shah@amd.com
>
> The base for the series is generally the latest rc1. A different dependency
> should be noted in *this* patch.
>
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure 'yamllint' is installed and dt-schema is up to
> date:
>
> pip3 install dtschema --upgrade
>
> Please check and re-submit after running the above command yourself. Note
> that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> your schema. However, it must be unset to test all examples with your schema.
>