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Message-ID: <CAGETcx-OmbNYJB_1wEX5c=tVC+yPLhgiEXqq3EZnM6JAZxLPdA@mail.gmail.com>
Date:   Thu, 27 Jun 2019 19:36:46 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sandeep Patil <sspatil@...roid.com>,
        Mark Rutland <mark.rutland@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        David Collins <collinsd@...eaurora.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [RESEND PATCH v1 0/5] Solve postboot supplier cleanup and
 optimize probe ordering

On Wed, Jun 26, 2019 at 2:31 PM Rob Herring <robh+dt@...nel.org> wrote:
>
> On Mon, Jun 24, 2019 at 9:54 PM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Mon, Jun 24, 2019 at 03:37:07PM -0700, Sandeep Patil wrote:
> > > We are trying to make sure that all (most) drivers in an Aarch64 system can
> > > be kernel modules for Android, like any other desktop system for
> > > example. There are a number of problems we need to fix before that happens
> > > ofcourse.
> >
> > I will argue that this is NOT an android-specific issue.  If the goal of
> > creating an arm64 kernel that will "just work" for a wide range of
> > hardware configurations without rebuilding is going to happen, we need
> > to solve this problem with DT.  This goal was one of the original wishes
> > of the arm64 development effort, let's not loose sight of it as
> > obviously, this is not working properly just yet.
>
> I fail to see how the different Linux behavior between drivers
> built-in and as modules has anything whatsoever to do with DT.

You are right, built-in vs module problem is not a DT issue. But this
is not so much a built-in vs module issue. It's just that built-in has
a hack available that works sometimes. But really, both are broken.

> Fix the
> problems in Linux and use the dependencies that are already expressed
> in DT and *then* we can talk about using DT to provide *hints* for
> solving any remaining problems.

Done. Sent v2 patch series that uses existing bindings.

-Saravana

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