linux-kernel - Re: [PATCH 1/3] dt-bindings: sram: qcom,imem: Allow modem-tables

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Message-ID: <7707b574-6fcf-487d-909a-d24874f9d686@ieee.org>
Date: Fri, 23 May 2025 12:59:24 -0500
From: Alex Elder <elder@...e.org>
To: Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Alex Elder <elder@...nel.org>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH 1/3] dt-bindings: sram: qcom,imem: Allow modem-tables

On 5/22/25 6:08 PM, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> The IP Accelerator hardware/firmware owns a sizeable region within the
> IMEM, ominously named 'modem-tables', presumably having to do with some
> internal IPA-modem specifics.
> 
> It's not actually accessed by the OS, although we have to IOMMU-map it
> with the IPA device, so that presumably the firmware can act upon it.
> 
> Allow it as a subnode of IMEM.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

So this will just show up as a subnode of an sram@... node,
the way "qcom,pil-reloc-info" does.  This is great.

Is it called "modem-tables" in internal documentation?  Or
did you choose this ominous name?

Reviewed-by: Alex Elder <elder@...cstar.com>

> ---
>   Documentation/devicetree/bindings/sram/qcom,imem.yaml | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sram/qcom,imem.yaml b/Documentation/devicetree/bindings/sram/qcom,imem.yaml
> index 2711f90d9664b70fcd1e2f7e2dfd3386ed5c1952..7c882819222dc04190db357ac6f9a3a35137cc9e 100644
> --- a/Documentation/devicetree/bindings/sram/qcom,imem.yaml
> +++ b/Documentation/devicetree/bindings/sram/qcom,imem.yaml
> @@ -51,6 +51,9 @@ properties:
>       $ref: /schemas/power/reset/syscon-reboot-mode.yaml#
>   
>   patternProperties:
> +  "^modem-tables@[0-9a-f]+$":
> +    description: Region reserved for the IP Accelerator
> +
>     "^pil-reloc@[0-9a-f]+$":
>       $ref: /schemas/remoteproc/qcom,pil-info.yaml#
>       description: Peripheral image loader relocation region
>