linux-kernel - Re: [linux-sunxi] [PATCH v3 2/3] dt-bindings: media: Add Allwinner V3s Camera Sensor Interface (CSI)

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Date:   Mon, 18 Dec 2017 17:43:09 +0800
From:   Yong <yong.deng@...ewell.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     wens@...e.org, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Benoit Parrot <bparrot@...com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Hugues Fruchet <hugues.fruchet@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Ramesh Shanmugasundaram <ramesh.shanmugasundaram@...renesas.com>,
        Yannick Fertre <yannick.fertre@...com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Rick Chang <rick.chang@...iatek.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Ondřej Jirman <megous@...ous.com>
Subject: Re: [linux-sunxi] [PATCH v3 2/3] dt-bindings: media: Add Allwinner
 V3s Camera Sensor Interface (CSI)

Hi,

On Mon, 18 Dec 2017 10:24:37 +0100
Maxime Ripard <maxime.ripard@...e-electrons.com> wrote:

> Hi,
> 
> On Mon, Dec 18, 2017 at 04:49:21PM +0800, Yong wrote:
> > > > +               compatible = "allwinner,sun8i-v3s-csi";
> > > > +               reg = <0x01cb4000 0x1000>;
> > > > +               interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
> > > > +               clocks = <&ccu CLK_BUS_CSI>,
> > > > +                        <&ccu CLK_CSI1_SCLK>,
> > > 
> > > CSI also has an MCLK. Do you need that one?
> > 
> > MCLK is not needed if the front end is not a sensor (like adv7611).
> > I will add it as an option.
> 
> I guess this should always be needed then. And the driver will make
> the decision to enable it or not.

But how the driver to know if it should be enabled?
I think MCLK should be added in DT just if the subdev need it.

> 
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


Thanks,
Yong