linux-kernel - Re: [PATCH V3 0/5] firmware: Add support for TI System Control Interface (TI-SCI) protocol driver

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Message-ID: <m2y432nvs8.fsf@baylibre.com>
Date:   Thu, 08 Sep 2016 10:31:03 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Nishanth Menon <nm@...com>
Cc:     Rob Herring <robh@...nel.org>, Tero Kristo <t-kristo@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        <devicetree@...r.kernel.org>, Dave Gerlach <d-gerlach@...com>,
        Lokesh Vutla <lokeshvutla@...com>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, "Andrew F . Davis" <afd@...com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Russ Dill <Russ.Dill@...com>,
        Sudeep Holla <sudeep.holla@....com>,
        <linux-arm-kernel@...ts.infradead.org>, <narmstrong@...libre.com>,
        Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
        David Griego <david.griego@...aro.org>
Subject: Re: [PATCH V3 0/5] firmware: Add support for TI System Control Interface (TI-SCI) protocol driver

Nishanth Menon <nm@...com> writes:

> On 09/07/2016 01:55 PM, Kevin Hilman wrote:
>> Nishanth Menon <nm@...com> writes:
>
> [...] full mail thread in https://lkml.org/lkml/2016/9/6/747
>
>>> Overall architecture is very similar to SCPI[4] as follows:
>>
>> Dumb Q: I'm curious about the limitations in SCPI that were found that
>> made TI decided to implement its own version.

[...]

> Long story short, investigation was done into what SCPI was providing
> (TI internal ofcourse) and SCPI did not fit our SoC generation needs -

Thanks for the detailed explanation.  Very helpful.

To be clear, I'm not a proponent of always using ARM "standards"
(especially when it's not exactly clear if it's a standard or a Juno
thing) but I'm seeing several SoCs come out with SCPI derivatives, or
old ARM versions etc., so was just curious about the decision making
process.

Thanks for sharing,

Kevin