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

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Date: Tue, 19 Mar 2024 06:28:59 +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 13:13, 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>

And unreviewed. It turns out you now mix devices and bring incompatible
programming models under one compatible. And this leads to problems in
your further patches.

NAK.

Best regards,
Krzysztof