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Message-ID: <4c1f2341-8cf8-4a5d-8877-9ba1d03defc2@amd.com>
Date: Tue, 12 Mar 2024 10:49:00 -0500
From: Tanmay Shah <tanmay.shah@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
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 v12 2/4] dt-bindings: remoteproc: add Tightly Coupled
Memory (TCM) bindings
On 3/12/24 7:10 AM, Krzysztof Kozlowski wrote:
> On 11/03/2024 17:27, Tanmay Shah wrote:
> >>> + then:
> >>> + patternProperties:
> >>> + "^r5f@[0-9a-f]+$":
> >>> + type: object
> >>> +
> >>> + properties:
> >>> + reg:
> >>> + minItems: 1
> >>> + items:
> >>> + - description: ATCM internal memory
> >>> + - description: BTCM internal memory
> >>> + - description: extra ATCM memory in lockstep mode
> >>> + - description: extra BTCM memory in lockstep mode
> >>> +
> >>> + reg-names:
> >>> + minItems: 1
> >>> + items:
> >>> + - const: atcm0
> >>> + - const: btcm0
> >>> + - const: atcm1
> >>> + - const: btcm1
> >>
> >> Why power domains are flexible?
> >
> > User may not want to use all the TCMs. For example, if users want to turn-on only TCM-A and rest of them want to keep off, then
> >
> > they can avoid having power-domains of other TCMs in the device-tree. This helps with less power-consumption when needed.
> >
> > Hence flexible list of power-domains list.
> >
>
> Isn't turning on/off driver's job? Sorry, but what is "user" here? DTS
> describes bindings, not OS policy.
Thanks for reviews.
Correct driver turns on off TCM. However, system designers (users) have option
to not include TCM that is not needed in device-tree. So
power-domains are flexible, same as reg, and reg-names. ATCM is always
needed as vector table is in ATCM. R5 core power domain and ATCM
power-domain for each core is always required so minItems 2.
> Also, please wrap your replies to match email style.
>
> > I can certainly mention "items:" under power-domains property.
> >
> >
> >>
>
>
> Best regards,
> Krzysztof
>
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