linux-kernel - Re: [PATCH v4 25/26] [DO NOT MERGE] arm64: dts: allwinner: bananapi-m64: Bananapi S070WV20-CT16 DSI panel

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Message-ID: <CAMty3ZBQXcnU=490KREa=F-qctMtRep9-rrhrPd1UZStnV=hqw@mail.gmail.com>
Date:   Wed, 14 Nov 2018 12:01:33 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi@...glegroups.com, linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v4 25/26] [DO NOT MERGE] arm64: dts: allwinner:
 bananapi-m64: Bananapi S070WV20-CT16 DSI panel

On Tue, Nov 13, 2018 at 5:52 PM Andre Przywara <andre.przywara@....com> wrote:
>
> On Tue, 13 Nov 2018 16:46:32 +0530
> Jagan Teki <jagan@...rulasolutions.com> wrote:
>
> Hi,
>
> > This patch add support for Bananapi S070WV20-CT16 DSI panel to
> > BPI-M64 board.
> >
> > DSI panel connected via board DSI port with,
> > - DC1SW as AVDD supply
>
> Are you sure of that? I don't see anything in the schematic to support
> this. The only power lines that go to the DSI connector are DCDC1 and
> PS. DC1SW is only connected to PortD on the SoC and to the Ethernet PHY.
> Is there anything I miss?

Thanks for the comment, yes dc1sw is connected in ephy. I have reused
dc1, BSP is attached lcd_power1 to axp81x_dc1sw [1]. I just looking
for someone to comment, may be we can skip this regulator attachment.

>
> > - DCDC1 as DVDD supply
>
> That seems right, but doesn't match with what you write below.

Commit need to fix s/DCDC1/DLDO1

>
> > - PD6 gpio for reset pin
> > - PD5 gpio for backlight enable pin
> > - PD7 gpio for backlight vdd supply
> >
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> >  .../dts/allwinner/sun50i-a64-bananapi-m64.dts | 42
> > +++++++++++++++++++ 1 file changed, 42 insertions(+)
> >
> > diff --git
> > a/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts
> > b/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts index
> > ef1c90401bb2..6cb010e3bbd9 100644 ---
> > a/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts +++
> > b/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts @@ -45,6
> > +45,7 @@ #include "sun50i-a64.dtsi"
> >  #include <dt-bindings/gpio/gpio.h>
> > +#include <dt-bindings/pwm/pwm.h>
> >
> >  / {
> >       model = "BananaPi-M64";
> > @@ -56,6 +57,15 @@
> >               serial1 = &uart1;
> >       };
> >
> > +     backlight: backlight {
> > +             compatible = "pwm-backlight";
> > +             pwms = <&r_pwm 0 50000 PWM_POLARITY_INVERTED>;
> > +             brightness-levels = <1 2 4 8 16 32 64 128 512>;
> > +             default-brightness-level = <2>;
> > +             enable-gpios = <&pio 3 5 GPIO_ACTIVE_HIGH>; /*
> > LCD-BL-EN: PD5 */
> > +             power-supply = <&reg_vdd_backlight>;
> > +     };
> > +
> >       chosen {
> >               stdout-path = "serial0:115200n8";
> >       };
> > @@ -91,6 +101,15 @@
> >               };
> >       };
> >
> > +     reg_vdd_backlight: vdd-backlight {
> > +             compatible = "regulator-fixed";
> > +             regulator-name = "vdd-backlight";
> > +             regulator-min-microvolt = <3300000>;
> > +             regulator-max-microvolt = <3300000>;
> > +             gpio = <&pio 3 7 GPIO_ACTIVE_HIGH>; /* LCD-PWR-EN:
> > PD7 */
> > +             enable-active-high;
> > +     };
> > +
> >       wifi_pwrseq: wifi_pwrseq {
> >               compatible = "mmc-pwrseq-simple";
> >               reset-gpios = <&r_pio 0 2 GPIO_ACTIVE_LOW>; /* PL2 */
> > @@ -101,6 +120,23 @@
> >       status = "okay";
> >  };
> >
> > +&dphy {
> > +     status = "okay";
> > +};
> > +
> > +&dsi {
> > +     status = "okay";
> > +
> > +     panel@0 {
> > +             compatible = "bananapi,s070wv20-ct16-icn6211";
> > +             reg = <0>;
> > +             avdd-supply = <&reg_dc1sw>;
>
> As mentioned above, I don't see this on the DSI connector.
>
> > +             dvdd-supply = <&reg_dldo1>;
>
> Mmh, this line is connected to the *SoC*, to drive the DSI data lines
> or the DPHY, presumably. So I wouldn't expect it in the panel node, but
> rather in the DPHY or DSI node. Although I can't find a power-supply
> property in those bindings.

Got it, this has to attach via vcc-dsi-supply.

[1] https://github.com/BPI-SINOVOIP/BPI-M64-bsp/blob/master/bootloader/blobs/bpi-m64-lcd7.dts#L2266