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Message-ID: <3d602e0b-a49c-4281-bc51-f8c015c5606f@linaro.org>
Date: Tue, 12 Mar 2024 19:34:32 +0100
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Subject: Re: [PATCH v13 2/4] dt-bindings: remoteproc: add Tightly Coupled
 Memory (TCM) bindings
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To: Tanmay Shah <tanmay.shah@amd.com>, andersson@kernel.org,
 mathieu.poirier@linaro.org, robh+dt@kernel.org,
 krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
 michal.simek@amd.com, ben.levinsky@amd.com
Cc: linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
References: <20240311175926.1625180-1-tanmay.shah@amd.com>
 <20240311175926.1625180-3-tanmay.shah@amd.com>
 <d498d76e-b021-4cf7-adca-63f1cd3e1542@linaro.org>
 <fdad2198-5d3a-4bce-8249-8b2f9f75f84a@amd.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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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@amd.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@amd.com>
>>> Signed-off-by: Tanmay Shah <tanmay.shah@amd.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@linaro.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