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Message-ID: <d498d76e-b021-4cf7-adca-63f1cd3e1542@linaro.org>
Date: Tue, 12 Mar 2024 13:13:37 +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 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>
Best regards,
Krzysztof
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