linux-kernel - Re: [EXT] Re: [PATCH] bus: fsl-mc: Add ACPI support for fsl-mc

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Message-ID: <20200131074050.38d78ff0@cakuba.hsd1.ca.comcast.net>
Date:   Fri, 31 Jan 2020 07:40:50 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>, Robin Murphy <robin.murphy@....com>,
        Calvin Johnson <calvin.johnson@....com>, stuyoder@...il.com,
        nleeder@...eaurora.org, Ioana Ciornei <ioana.ciornei@....com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Will Deacon <will@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Pankaj Bansal <pankaj.bansal@....com>,
        Jon Nettleton <jon@...id-run.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Len Brown <lenb@...nel.org>,
        Jason Cooper <jason@...edaemon.net>,
        Andy Wang <Andy.Wang@....com>,
        Makarand Pawagi <makarand.pawagi@....com>,
        Varun Sethi <V.Sethi@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Paul Yang <Paul.Yang@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "<netdev@...r.kernel.org>" <netdev@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [EXT] Re: [PATCH] bus: fsl-mc: Add ACPI support for fsl-mc

On Fri, 31 Jan 2020 15:15:00 +0000, Russell King - ARM Linux admin
wrote:
> I have some prototype implementation for driving the QSFP+ cage, but
> I haven't yet worked out how to sensible deal with the "is it 4x 10G
> or 1x 40G" issue you mention above, and how to interface the QSFP+
> driver sensibly with one or four network drivers.

I'm pretty sure you know this but just FWIW - vendors who do it in FW
write the current config down in NVM so it doesn't get affected by
reboots and use devlink port splitting to change it.