linux-kernel - Re: [PATCH v13 2/4] dt-bindings: remoteproc: add Tightly Coupled Memory (TCM) bindings

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Date: Tue, 12 Mar 2024 19:34:32 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Tanmay Shah <tanmay.shah@....com>, andersson@...nel.org,
 mathieu.poirier@...aro.org, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 michal.simek@....com, ben.levinsky@....com
Cc: linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Radhey Shyam Pandey <radhey.shyam.pandey@....com>
Subject: Re: [PATCH v13 2/4] dt-bindings: remoteproc: add Tightly Coupled
 Memory (TCM) bindings

On 12/03/2024 18:42, Tanmay Shah wrote:
> 
> 
> On 3/12/24 7:13 AM, Krzysztof Kozlowski wrote:
>> On 11/03/2024 18:59, 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 v13:
>>>   - Have power-domains property for lockstep case instead of
>>>     keeping it flexible.
>>>   - Add "items:" list in power-domains property
>>
>>
>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> Hi Krzysztof,
> 
> Thanks for RB. I provided explanation of flexible power-domains in
> previous patchset. I am happy to send new revision removing
> minItems if you dis-agree.

Thanks for the explanation, it sounds fine, thus patch LGTM.

Best regards,
Krzysztof