linux-kernel - Re: [PATCH 3/5] clk: mvebu: ap806: introduce a new binding

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Date:   Tue, 23 May 2017 10:26:12 -0500
From:   Rob Herring <robh@...nel.org>
To:     Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:     Stephen Boyd <sboyd@...eaurora.org>,
        Mike Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Nadav Haklai <nadavh@...vell.com>,
        Kostya Porotchkin <kostap@...vell.com>,
        Neta Zur Hershkovits <neta@...vell.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Omri Itach <omrii@...vell.com>,
        Shadi Ammouri <shadi@...vell.com>
Subject: Re: [PATCH 3/5] clk: mvebu: ap806: introduce a new binding

On Fri, May 19, 2017 at 05:58:03PM +0200, Gregory CLEMENT wrote:
> As for cp110, the initial intent when the binding of the ap806 system
> controller was to have one flat node. The idea being that what is
> currently a clock-only driver in drivers would become a MFD driver,
> exposing the clock, GPIO and pinctrl functionality. However, after taking
> a step back, this would lead to a messy binding. Indeed, a single node
> would be a GPIO controller, clock controller, pinmux controller, and
> more.
> 
> This patch adopts a more classical solution of a top-level syscon node
> with sub-nodes for the individual devices. The main benefit will be to
> have each functional block associated to its own sub-node where we can
> put its own properties.
> 
> The introduction of the Armada 7K/8K is still in the early stage so the
> plan is to remove the old binding. However, we don't want to break the
> device tree compatibility for the few devices already in the field. For
> this we still keep the support of the legacy compatible string with a big
> warning in the kernel about updating the device tree.
> 
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> ---
>  Documentation/devicetree/bindings/arm/marvell/ap806-system-controller.txt | 20 +++++++++++++++-----
>  drivers/clk/mvebu/ap806-system-controller.c                               | 56 ++++++++++++++++++++++++++++++++++++++++++++------------
>  2 files changed, 59 insertions(+), 17 deletions(-)

Acked-by: Rob Herring <robh@...nel.org>