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

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Message-Id: <20171218164921.227b82349c778283f5e5eba8@magewell.com>
Date:   Mon, 18 Dec 2017 16:49:21 +0800
From:   Yong <yong.deng@...ewell.com>
To:     wens@...e.org
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        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)

On Mon, 18 Dec 2017 16:35:51 +0800
Chen-Yu Tsai <wens@...e.org> wrote:

> On Mon, Nov 13, 2017 at 3:32 PM, Yong Deng <yong.deng@...ewell.com> wrote:
> > Add binding documentation for Allwinner V3s CSI.
> >
> > Signed-off-by: Yong Deng <yong.deng@...ewell.com>
> > ---
> >  .../devicetree/bindings/media/sun6i-csi.txt        | 51 ++++++++++++++++++++++
> >  1 file changed, 51 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/sun6i-csi.txt
> >
> > diff --git a/Documentation/devicetree/bindings/media/sun6i-csi.txt b/Documentation/devicetree/bindings/media/sun6i-csi.txt
> > new file mode 100644
> > index 0000000..f3916a2
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/sun6i-csi.txt
> > @@ -0,0 +1,51 @@
> > +Allwinner V3s Camera Sensor Interface
> > +------------------------------
> > +
> > +Required properties:
> > +  - compatible: value must be "allwinner,sun8i-v3s-csi"
> > +  - reg: base address and size of the memory-mapped region.
> > +  - interrupts: interrupt associated to this IP
> > +  - clocks: phandles to the clocks feeding the CSI
> > +    * bus: the CSI interface clock
> > +    * mod: the CSI module clock
> > +    * ram: the CSI DRAM clock
> > +  - clock-names: the clock names mentioned above
> > +  - resets: phandles to the reset line driving the CSI
> > +
> > +- ports: A ports node with endpoint definitions as defined in
> > +  Documentation/devicetree/bindings/media/video-interfaces.txt.
> > +  Currently, the driver only support the parallel interface. So, a single port
> > +  node with one endpoint and parallel bus is supported.
> > +
> > +Example:
> > +
> > +       csi1: csi@...b4000 {
> 
> Drop the leading zero in the address part.

OK.

> 
> > +               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.

> 
> ChenYu
> 
> > +                        <&ccu CLK_DRAM_CSI>;
> > +               clock-names = "bus", "mod", "ram";
> > +               resets = <&ccu RST_BUS_CSI>;
> > +
> > +               port {
> > +                       #address-cells = <1>;
> > +                       #size-cells = <0>;
> > +
> > +                       /* Parallel bus endpoint */
> > +                       csi1_ep: endpoint {
> > +                               remote-endpoint = <&adv7611_ep>;
> > +                               bus-width = <16>;
> > +                               data-shift = <0>;
> > +
> > +                               /* If hsync-active/vsync-active are missing,
> > +                                  embedded BT.656 sync is used */
> > +                               hsync-active = <0>; /* Active low */
> > +                               vsync-active = <0>; /* Active low */
> > +                               data-active = <1>;  /* Active high */
> > +                               pclk-sample = <1>;  /* Rising */
> > +                       };
> > +               };
> > +       };
> > +
> > --
> > 1.8.3.1
> >
> > --
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Thanks,
Yong