linux-kernel - Re: [PATCH 3/7] clk: mvebu: cp110: do not depend anymore of the *-clock-output-names

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Date:   Tue, 23 May 2017 10:19:09 -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 3/7] clk: mvebu: cp110: do not depend anymore of the
 *-clock-output-names

On Fri, May 19, 2017 at 05:55:21PM +0200, Gregory CLEMENT wrote:
> Using the *-clock-output-names property was a convenient way to have a
> unique name for each clock even when there are multiple cp110 blocks
> as we can find on Armada 8K.
> 
> However it has some drawbacks: the main one being a stronger link than
> necessary between the driver and the device tree. For example the clock
> name can't be changed, removed or moved. It is still the early stage of
> introduction of the Armada 7K/8K and the hardware is still not totally
> documented, especially for the clock part. By removing the use of
> *-clock-output-names it will be easier to add new clocks without breaking
> the compatibility.
> 
> The name of each clock is now created by using its physical address as a
> prefix (as it was done for the platform device names). Thanks to this we
> have an automatic way to compute a unique name.
> 
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> ---
>  Documentation/devicetree/bindings/arm/marvell/cp110-system-controller0.txt |  14 +----------
>  drivers/clk/mvebu/cp110-system-controller.c                                | 106 ++++++++++++++++++++++++++++++++++++++++++++----------------------------
>  2 files changed, 65 insertions(+), 55 deletions(-)

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