Subject: Re: [RESEND in plain-test] Re: [PATCH v5 0/9] Add initial support for
 the i.MXRTxxxx SoC family starting from i.IMXRT1050 SoC.
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Jesse Taube <mr.bossman075@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Sascha Hauer <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Dong Aisheng <aisheng.dong@nxp.com>,
        Stefan Agner <stefan@agner.ch>,
        Linus Walleij <linus.walleij@linaro.org>,
        gregkh <gregkh@linuxfoundation.org>,
        Olof Johansson <olof@lixom.net>, SoC Team <soc@kernel.org>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Abel Vesa <abel.vesa@nxp.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Jiri Slaby <jirislaby@kernel.org>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>,
        linux-clk <linux-clk@vger.kernel.org>,
        DTML <devicetree@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-mmc <linux-mmc@vger.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
        Vladimir Murzin <vladimir.murzin@arm.com>
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 <CAK8P3a29tzgd_4WncippZBEJra9n0bQTysBkPBp_WA0sb28gTg@mail.gmail.com>
 <1360c4fe-4a09-a8a1-3224-7f1d4af59f6f@benettiengineering.com>
 <CAK8P3a1oZK1qMRBE3D8otCTY6Lg4jMXxVpAZHQzLTA8woA3_UQ@mail.gmail.com>
 <634e9304-2eba-4ea9-65ac-5d4f5d011b70@benettiengineering.com>
 <CAK8P3a3kpzi6ozLkTH9GtWqvs=JHkm6mp=dLs2vOHjrW=FoYdw@mail.gmail.com>
From:   Giulio Benetti <giulio.benetti@benettiengineering.com>
Message-ID: <88f5ec3a-8765-48b2-0429-d182402826be@benettiengineering.com>
Date:   Fri, 17 Dec 2021 12:54:05 +0100
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On 17/12/21 11:28, Arnd Bergmann wrote:
> On Fri, Dec 17, 2021 at 10:54 AM Giulio Benetti
> <giulio.benetti@benettiengineering.com> wrote:
>> On 16/12/21 22:13, Arnd Bergmann wrote:
>>
>>> Vladimir has put some work into making Cortex-R work in the kernel, and
>>> he may have some other thoughts on this question.
>>
>> I'm curious if he has something specific to Cortex-R to tell.
>>
>> I've found that Cortex-R82 has a MMU:
>> https://www.arm.com/products/silicon-ip-cpu/cortex-r/cortex-r82
>> but I can't find any SoC that uses it. Also, I don't know how many
>> people could use it honestly.
> 
> R82 is fairly new, but I expect that we will see support in Linux in the
> future. Aside from having an MMU, it also 64-bit-only, so we'd treat
> it like a normal ARMv8-A core in arch/arm64.

Ah yes, that's fine. So let's wait for the future, in the meanwhile we 
focus con i.MXRT :-)

Thank you
Best regards
-- 
Giulio Benetti
Benetti Engineering sas