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Date:   Fri, 13 Mar 2020 23:27:17 +0200
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Magnus Damm <magnus.damm@gmail.com>,
        Ezequiel Garcia <ezequiel@collabora.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-renesas-soc@vger.kernel.org" 
        <linux-renesas-soc@vger.kernel.org>,
        Fabio Estevam <festevam@gmail.com>,
        "linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 1/4] media: dt-bindings: media: i2c: Switch to
 assigned-clock-rates
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Hi Prabhakar,

On Fri, Mar 13, 2020 at 09:25:01PM +0000, Prabhakar Mahadev Lad wrote:
> On Sent: 13 March 2020 21:20, Laurent Pinchart wrote:
> > On Fri, Mar 13, 2020 at 09:12:31PM +0000, Lad Prabhakar wrote:
> > > Use assigned-clock-rates to specify the clock rate. Also mark
> > > clock-frequency property as deprecated.
> >
> > I would phrase it the other way around, this patch mainly deprecates clock-
> > frequency, and as a side effect recommends usage of assigned-clock-rates.
> >
> > "Deprecate usage of the clock-frequency propertly. The preferred method
> > to set clock rates is to use assigned-clock-rates."
>
> Agreed will do that.
> 
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > ---
> > >  Documentation/devicetree/bindings/media/i2c/ov5645.txt | 5 +++--
> > >  1 file changed, 3 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > > b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > > index 72ad992..e62fe82 100644
> > > --- a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > > +++ b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > > @@ -8,7 +8,7 @@ Required Properties:
> > >  - compatible: Value should be "ovti,ov5645".
> > >  - clocks: Reference to the xclk clock.
> > >  - clock-names: Should be "xclk".
> > > -- clock-frequency: Frequency of the xclk clock.
> > > +- clock-frequency (deprecated): Frequency of the xclk clock.
> >
> > I would drop this completely. Drivers need to ensure backward compatibility,
> > but DT bindings should only document the latest version, the history is
> > available in git.
> >
> Sure will drop it.
> 
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >
> > While at it, can I enlist you to convert these bindings to yaml ? :-)
> >
> Sure will do the honours ????, will make sure yaml patch is ontop of this patch too.

Thank you :-)

> > >  - enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
> > >    to the hardware pin PWDNB which is physically active low.
> > >  - reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
> > > @@ -37,7 +37,8 @@ Example:
> > >
> > >  clocks = <&clks 200>;
> > >  clock-names = "xclk";
> > > -clock-frequency = <24000000>;
> > > +assigned-clocks = <&clks 200>;
> > > +assigned-clock-rates = <24000000>;
> > >
> > >  vdddo-supply = <&camera_dovdd_1v8>;
> > >  vdda-supply = <&camera_avdd_2v8>;

-- 
Regards,

Laurent Pinchart