linux-kernel - Re: [PATCH 4/7] clk: mvebu: cp110: introduce a new binding

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Message-ID: <20170523152233.5jxya2rgluric2pd@rob-hp-laptop>
Date:   Tue, 23 May 2017 10:22:33 -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 4/7] clk: mvebu: cp110: introduce a new binding

On Fri, May 19, 2017 at 05:55:22PM +0200, Gregory CLEMENT wrote:
> The initial intent when the binding of the cp110 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.

Good.

> Reviewed-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> ---
>  Documentation/devicetree/bindings/arm/marvell/cp110-system-controller0.txt | 18 ++++++++++++++----
>  drivers/clk/mvebu/cp110-system-controller.c                                | 63 ++++++++++++++++++++++++++++++++++++++++++++++++---------------
>  2 files changed, 62 insertions(+), 19 deletions(-)

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