linux-kernel - Re: [PATCH 06/14] arm64: dts: sparx5: Add basic cpu support

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Message-ID: <87wo59ofhn.fsf@soft-dev15.microsemi.net>
Date:   Mon, 18 May 2020 09:43:16 +0200
From:   Lars Povlsen <lars.povlsen@...rochip.com>
To:     Robin Murphy <robin.murphy@....com>
CC:     Lars Povlsen <lars.povlsen@...rochip.com>,
        Marc Zyngier <maz@...terjones.org>,
        <devicetree@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Arnd Bergmann <arnd@...db.de>, Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, SoC Team <soc@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Olof Johansson" <olof@...om.net>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>
Subject: Re: [PATCH 06/14] arm64: dts: sparx5: Add basic cpu support


Robin Murphy writes:

> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> On 2020-05-15 16:09, Lars Povlsen wrote:
> [...]
>>>> +             cpu0: cpu@0 {
>>>> +                     compatible = "arm,cortex-a53", "arm,armv8";
>
> Side note: only one compatible string for the real CPU please, running a
> DT bindings check should complain about that.
>

I'll change this.

>>>> +                     device_type = "cpu";
>>>> +                     reg = <0x0 0x0>;
>>>> +                     enable-method = "spin-table";
>>>
>>> Really? This is 2020, not 2012 any more. Surely a new platform
>>> boots using PSCI, and not *this*.
>>>
>>
>> We don't currently support PSCI. The platform does not have TrustZone,
>> hence we don't use ATF.
> AIUI, part of the purpose of ATF is to provide a nice standardised
> platform interface regardless of whether you care about Secure software
> or not. It shouldn't take much to knock up a trivial ATF port that just
> uses an internal spin-table for its PSCI backend - in fact I suspect
> that's probably just a copy-paste from the RPi3 port ;)
>

I'll change this to PSCI if that's whats expected these days. We
actually already have an ATF port. I fully understand the desire to
standardize on PSCI.

> Robin.

-- 
Lars Povlsen,
Microchip