linux-kernel - Re: [PATCH 4/9] PM / devfreq: exynos-bus: Replace deprecated 'devfreq' property

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Date:   Thu, 26 Dec 2019 14:01:19 -0700
From:   Rob Herring <robh@...nel.org>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     krzk@...nel.org, mark.rutland@....com, heiko@...ech.de,
        leonard.crestez@....com, lukasz.luba@....com, a.swigon@...sung.com,
        m.szyprowski@...sung.com, kgene@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 4/9] PM / devfreq: exynos-bus: Replace deprecated
 'devfreq' property

On Tue, Dec 17, 2019 at 02:57:33PM +0900, Chanwoo Choi wrote:
> In order to remove the deprecated 'devfreq' property, replace with
> new 'exynos,parent-bus' property in order to get the parent devfreq device
> in devicetree file instead of 'devfreq' property. But, to guarantee the
> backward-compatibility, keep the support 'devfreq' property.
> 
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  .../bindings/devfreq/exynos-bus.txt           | 16 +++++++--------
>  drivers/devfreq/exynos-bus.c                  | 20 ++++++++++++-------
>  2 files changed, 21 insertions(+), 15 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
> index e71f752cc18f..c948cee01124 100644
> --- a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
> +++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
> @@ -45,7 +45,7 @@ Required properties only for parent bus device:
>    of buses.
>  
>  Required properties only for passive bus device:
> -- devfreq: the parent bus device.
> +- exynos,parent-bus: the parent bus device.

If you are going to do something new, why not use the interconnect 
binding here?

Rob