linux-kernel - Re: [PATCH v2 2/3] arm64: dts: allwinner: a64: Add A64 CSI controller

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Date:   Thu, 6 Dec 2018 18:07:59 +0100
From:   Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Jagan Teki <jagan@...rulasolutions.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v2 2/3] arm64: dts: allwinner: a64: Add A64 CSI controller

Hi Maxime

On Thu, Dec 6, 2018 at 4:34 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Thu, Dec 06, 2018 at 06:53:05PM +0530, Jagan Teki wrote:
> > Allwinner A64 CSI controller has similar features as like in
> > H3, So add support for A64 via H3 fallback.
> >
> > Also updated CSI_SCLK to use 300MHz via assigned-clocks, since
> > the default clock 600MHz seems unable to drive the sensor(ov5640)
> > to capture the image.
> >
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> > Changes for v2:
> > - Use CSI_SCLK to 300MHz
> >
> >  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 23 +++++++++++++++++++
> >  1 file changed, 23 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > index 384c417cb7a2..d7ab0006ebce 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > @@ -532,6 +532,12 @@
> >                       interrupt-controller;
> >                       #interrupt-cells = <3>;
> >
> > +                     csi_pins: csi-pins {
> > +                             pins = "PE0", "PE2", "PE3", "PE4", "PE5", "PE6",
> > +                                    "PE7", "PE8", "PE9", "PE10", "PE11";
> > +                             function = "csi0";
> > +                     };
> > +
> >                       i2c0_pins: i2c0_pins {
> >                               pins = "PH0", "PH1";
> >                               function = "i2c0";
> > @@ -899,6 +905,23 @@
> >                       status = "disabled";
> >               };
> >
> > +             csi: csi@...0000 {
> > +                     compatible = "allwinner,sun50i-a64-csi",
> > +                                  "allwinner,sun8i-h3-csi";
> > +                     reg = <0x01cb0000 0x1000>;
> > +                     interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
> > +                     clocks = <&ccu CLK_BUS_CSI>,
> > +                              <&ccu CLK_CSI_SCLK>,
> > +                              <&ccu CLK_DRAM_CSI>;
> > +                     clock-names = "bus", "mod", "ram";
> > +                     resets = <&ccu RST_BUS_CSI>;
> > +                     pinctrl-names = "default";
> > +                     pinctrl-0 = <&csi_pins>;
> > +                     assigned-clocks = <&ccu CLK_CSI_SCLK>;
> > +                     assigned-clock-rates = <300000000>;
>
> That should be enforced in the driver.
>

We are not really sure what is the best here. Our first idea was to
put in the board file and then Jagan
decide to put in dtsi. We don't have enough coverage of camera on this
CPU and I prefer to stay with this
minimal change that does not impact the driver.

Michael

> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com



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| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
| COO  -  Founder                                      Cruquiuskade 47 |
| +31(0)851119172                                 Amsterdam 1018 AM NL |
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