Date:   Tue, 15 Nov 2022 18:02:43 +0100
From:   Martin Botka <martin.botka@...ainline.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Martin Botka <martin.botka1@...il.com>,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Jami Kettunen <jamipkettunen@...ainline.org>,
        Paul Bouchara <paul.bouchara@...ainline.org>,
        Jan Trmal <jtrmal@...il.com>, Tom <takuya@...uya.tech>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Maxime Ripard <maxime@...no.tech>,
        Conley Lee <conleylee@...mail.com>,
        Andrew Lunn <andrew@...n.ch>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] arm64: dts: Add basic support for BIQU CB1



On Tue, Nov 15 2022 at 02:27:14 PM +00:00:00, Andre Przywara 
<andre.przywara@....com> wrote:
> On Tue, 15 Nov 2022 12:38:59 +0100
> Martin Botka <martin.botka@...ainline.org> wrote:
> 
> Hi Martin,
> 
>>  On November 15, 2022 11:33:07 AM GMT+01:00, Andre Przywara 
>> <andre.przywara@....com> wrote:
>>  >On Tue, 15 Nov 2022 09:24:04 +0100
>>  >Martin Botka <martin.botka@...ainline.org> wrote:
>>  >
>>  >Hi,
>>  >
>>  >> On November 15, 2022 1:54:29 AM GMT+01:00, Andre Przywara 
>> <andre.przywara@....com> wrote:
>>  >> >On Tue, 15 Nov 2022 00:44:46 +0100
>>  >> >Martin Botka <martin.botka1@...il.com> wrote:
>>  >> >
>>  >> >Hi Martin,
>>  >> >
>>  >> >> I can totally understand how this can get confusing.
>>  >> >>
>>  >> >> Basically because of the Rpi shortage biqu decided to make an 
>> Rpi
>>  >> >> alternative.
>>  >> >>
>>  >> >> So they made CB1 which is compute module style board.
>>  >> >>
>>  >> >> And they made 3 other boards where CB1 or Rpi CM4 can be 
>> plugged in. The 3
>>  >> >> boards are:
>>  >> >>
>>  >> >> Rpi adapter which takes the Compute module style boards and 
>> turns them into
>>  >> >> SBC style with basically identical size and etc to Rpi 4.
>>  >> >>
>>  >> >> Then we have Manta M8P and M4P. These boards are MCUs for a 
>> 3D printer. But
>>  >> >> they were made for Klipper use case which requires a computer 
>> or SBC
>>  >> >> (Usually Rpi4). They combined it into 1 board.
>>  >> >> Where you get the MCU and you can plug in CM4 or CB1
>>  >> >
>>  >> >Thanks for the explanations! I was guessing along those 
>> shortage lines,
>>  >> >since the H616 is quite a step down from the RPi4CM, though 
>> probably
>>  >> >still enough for driving a 3D printer.
>>  >> Mostly yes
>>  >> >
>>  >> >> All these boards are basically taking the pins and routing 
>> them to ports.
>>  >> >
>>  >> >Yes, this is what those SoM carrier boards do ;-)
>>  >> :)
>>  >> >
>>  >> >> There is nearly 0 chips for conversion or processing of the 
>> pins from CB1
>>  >> >> or CM4 thus i do not see a reason for having parent dtsi and 
>> dts for the
>>  >> >> adapter and Manta boards.
>>  >> >
>>  >> >And the DT does not need to describe "chips" only, a lot of DT 
>> nodes
>>  >> >are about connectors, and which ports and which exact pins (out 
>> of the
>>  >> >possible pinmuxes) are actually used. The SoM itself mostly 
>> exposes
>>  >> >just pins, and the board DT describes how these pins are used 
>> (GPIO or
>>  >> >special function, for instance).
>>  >> >
>>  >> >So did you try to split this up? How would that look?
>>  >>
>>  >> The main difference between adapter and Manta boards is that 
>> adapter has 4x USB.
>>  >
>>  >So those are two double-type-A sockets? This is not really what 
>> the DT
>>  >below describes? It's perfectly fine to fix USB0 to host mode, we 
>> do this
>>  >on the Pine64 boards (both A64 and H6), for instance.
>> 
>>  Yes. But the third and fourth is also used. Third is done in 2.54 
>> 4p connector (just pins on board) and fourth is connected directly 
>> to manta stm32 MCU. So all 4 are host.
> 
> Wait, so you are talking about the Manta board now? I see two 
> sockets, the
> 2.54mm headers and the STM32 there, but the Pi4B is quite different in
> that respect: I see four(!) USB type-A sockets (two dual-port stacks).
> Plus the CM4 connector seems to only have pins for one USB 2.0 port
> (D-,D+). So is this a hub chip on the underside of the board, close 
> to the
> USB ports? Can you read the label of that chip?
> And where are the other H616 USB pins routed to? Are they (ab-)using 
> the
> PCIe pins of the CM4 connector? Or are they actually not used at all, 
> and
> it's all one USB port through a by-4 hub?
> If you have a running system, "lsusb -t" should give you a clue which 
> host
> ports are used and if there is a hub.
> 
> Cheers,
> Andre
> 
>>  >> Manta only has 3 and 1 otg. But it has a switch to disable or 
>> enable otg.
>>  >
>>  >What does the switch do, exactly? By definition OTG works fine in 
>> both
>>  >ways. And there are pins in the connector to decide the role.
>>  The switch is just signal pin for RS2227. Its the multiplexer i 
>> mentioned. It decides if we should have the pins wired to usb type C 
>> port or normally to stm32 MCU. Thats all it does.
>>  >
>>  >Allwinner actually goes one step further and provides a full HCI 
>> to the
>>  >same PHY that the MUSB OTG controller is connected to, so you 
>> don't need
>>  >to live with the sometimes limited performance of the MUSB host 
>> mode
>>  >(which we drive without DMA). Not sure if that is the case or a 
>> problem on
>>  >the RPi4.
>>  >
>>  >> Im not opposed to splitting it up. It is probably a good idea.
>>  >> I dont see how to resolve that switch on manta boards tho.
>>  >
>>  >If the Manta board is (almost) a superset of the Pi4B, then you can
>>  >include the latter from there. Look at sun50i-a64-pine64-lts.dts or
>>  >sun50i-h6-pine-h64-model-b.dts for examples.
>>  >
>>  >Cheers,
>>  >Andre.
>>  >
>>  Yep i will split it into SoM boards.
>>  >> >> The only exception to conversion are the LEDs on the boards 
>> but since both
>>  >> >> adapter and manta boards have them this yet again eliminates 
>> need for
>>  >> >> parent style DT.
>>  >> >>
>>  >> >> Best regards,
>>  >> >> Martin
>>  >> >>
>>  >> >> On Tue, Nov 15, 2022, 12:32 AM Andre Przywara 
>> <andre.przywara@....com>
>>  >> >> wrote:
>>  >> >>
>>  >> >> > On Mon, 14 Nov 2022 22:44:49 +0100
>>  >> >> > Martin Botka <martin.botka@...ainline.org> wrote:
>>  >> >> >
>>  >> >> > > CB1 is Compute Module style board that plugs into Rpi 
>> board style
>>  >> >> > adapter or
>>  >> >> > > Manta 3D printer boards (M4P/M8P).
>>  >> >> > >
>>  >> >> > > The board has:
>>  >> >> > >       H616 SoC
>>  >> >> > >       1GB of RAM
>>  >> >> > >       AXP313A PMIC
>>  >> >> > >
>>  >> >> > > And the actual boards that CB1 plugs in are just 
>> extension to it with
>>  >> >> > ports and
>>  >> >> > > thus are not split in DT.
>>  >> >> >
>>  >> >> > I don't really understand that sentence. There is some 
>> precedent for a
>>  >> >> > SoM/board split, look at the sun50i-a64-sopine or
>>  >> >> > sun50i-h5-emlid-neutis-n5 files. And if I see this 
>> correctly, then
>>  >> >> > there are *two* boards available for the same CB1 SoM, the 
>> PI4B and the
>>  >> >> > Manta board? Which would a strong case for a SoM .dtsi, 
>> plus the one
>>  >> >> > or two board .dts files.
>>  >> >> > I am just not sure whether that relation to the Pi4-CM is 
>> helpful or
>>  >> >> > just complicates things...
>>  >> >> >
>>  >> >> > Cheers,
>>  >> >> > Andre
>>  >> >> >
>>  >> >> > >
>>  >> >> > > Boards have:
>>  >> >> > >       4x (3x for Manta boards) USB and 1 USB OTG.
>>  >> >> > >       SDcard slot for loading images.
>>  >> >> > >       Ethernet port wired to the internal PHY.
>>  >> >> > >       2x HDMI 2.0.
>>  >> >> > >       Power and Status LEDs.
>>  >> >> > >
>>  >> >> > > Currently working:
>>  >> >> > >       Booting
>>  >> >> > >       USB
>>  >> >> > >       UART
>>  >> >> > >
>>  >> >> > > Signed-off-by: Martin Botka <martin.botka@...ainline.org>
>>  >> >> > > ---
>>  >> >> > > Changes in V2:
>>  >> >> > > Add proper board compatible
>>  >> >> > > Add regulator prefix for vcc5v
>>  >> >> > > Drop okay status from PMIC
>>  >> >> > > Drop standby_param
>>  >> >> > > Changes in V3:
>>  >> >> > > Change copyright to me
>>  >> >> > > regulator_vcc5v to regulator-vcc5v
>>  >> >> > > Drop ehci0 and ohci0
>>  >> >> > >  arch/arm64/boot/dts/allwinner/Makefile        |   1 +
>>  >> >> > >  .../dts/allwinner/sun50i-h616-biqu-cb1.dts    | 178 
>> ++++++++++++++++++
>>  >> >> > >  2 files changed, 179 insertions(+)
>>  >> >> > >  create mode 100644
>>  >> >> > arch/arm64/boot/dts/allwinner/sun50i-h616-biqu-cb1.dts
>>  >> >> > >
>>  >> >> > > diff --git a/arch/arm64/boot/dts/allwinner/Makefile
>>  >> >> > b/arch/arm64/boot/dts/allwinner/Makefile
>>  >> >> > > index 6a96494a2e0a..223f1be73541 100644
>>  >> >> > > --- a/arch/arm64/boot/dts/allwinner/Makefile
>>  >> >> > > +++ b/arch/arm64/boot/dts/allwinner/Makefile
>>  >> >> > > @@ -38,5 +38,6 @@ dtb-$(CONFIG_ARCH_SUNXI) += 
>> sun50i-h6-pine-h64.dtb
>>  >> >> > >  dtb-$(CONFIG_ARCH_SUNXI) += 
>> sun50i-h6-pine-h64-model-b.dtb
>>  >> >> > >  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h6-tanix-tx6.dtb
>>  >> >> > >  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h6-tanix-tx6-mini.dtb
>>  >> >> > > +dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h616-biqu-cb1.dtb
>>  >> >> > >  dtb-$(CONFIG_ARCH_SUNXI) += 
>> sun50i-h616-orangepi-zero2.dtb
>>  >> >> > >  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h616-x96-mate.dtb
>>  >> >> > > diff --git 
>> a/arch/arm64/boot/dts/allwinner/sun50i-h616-biqu-cb1.dts
>>  >> >> > b/arch/arm64/boot/dts/allwinner/sun50i-h616-biqu-cb1.dts
>>  >> >> > > new file mode 100644
>>  >> >> > > index 000000000000..86b5aca9b53e
>>  >> >> > > --- /dev/null
>>  >> >> > > +++ 
>> b/arch/arm64/boot/dts/allwinner/sun50i-h616-biqu-cb1.dts
>>  >> >> > > @@ -0,0 +1,178 @@
>>  >> >> > > +// SPDX-License-Identifier: (GPL-2.0+ or MIT)
>>  >> >> > > +/*
>>  >> >> > > + * Copyright (C) 2022 Martin Botka 
>> <martin.botka@...ainline.org>.
>>  >> >> > > + */
>>  >> >> > > +
>>  >> >> > > +/dts-v1/;
>>  >> >> > > +
>>  >> >> > > +#include "sun50i-h616.dtsi"
>>  >> >> > > +
>>  >> >> > > +#include <dt-bindings/gpio/gpio.h>
>>  >> >> > > +#include <dt-bindings/interrupt-controller/arm-gic.h>
>>  >> >> > > +#include <dt-bindings/leds/common.h>
>>  >> >> > > +
>>  >> >> > > +/ {
>>  >> >> > > +     model = "BIQU CB1";
>>  >> >> > > +     compatible = "biqu,cb1", "allwinner,sun50i-h616";
>>  >> >> > > +
>>  >> >> > > +     aliases {
>>  >> >> > > +             serial0 = &uart0;
>>  >> >> > > +     };
>>  >> >> > > +
>>  >> >> > > +     chosen {
>>  >> >> > > +             stdout-path = "serial0:115200n8";
>>  >> >> > > +     };
>>  >> >> > > +
>>  >> >> > > +     leds {
>>  >> >> > > +             compatible = "gpio-leds";
>>  >> >> > > +
>>  >> >> > > +             led-0 {
>>  >> >> > > +                     function = LED_FUNCTION_POWER;
>>  >> >> > > +                     color = <LED_COLOR_ID_RED>;
>>  >> >> > > +                     gpios = <&pio 2 12 
>> GPIO_ACTIVE_HIGH>; /* PC12 */
>>  >> >> > > +                     default-state = "on";
>>  >> >> > > +             };
>>  >> >> > > +
>>  >> >> > > +             led-1 {
>>  >> >> > > +                     function = LED_FUNCTION_STATUS;
>>  >> >> > > +                     color = <LED_COLOR_ID_GREEN>;
>>  >> >> > > +                     gpios = <&pio 2 13 
>> GPIO_ACTIVE_HIGH>; /* PC13 */
>>  >> >> > > +             };
>>  >> >> > > +     };
>>  >> >> > > +
>>  >> >> > > +     reg_vcc5v: regulator-vcc5v {
>>  >> >> > > +             /* board wide 5V supply directly from the 
>> USB-C socket */
>>  >> >> > > +             compatible = "regulator-fixed";
>>  >> >> > > +             regulator-name = "vcc-5v";
>>  >> >> > > +             regulator-min-microvolt = <5000000>;
>>  >> >> > > +             regulator-max-microvolt = <5000000>;
>>  >> >> > > +             regulator-always-on;
>>  >> >> > > +     };
>>  >> >> > > +
>>  >> >> > > +     reg_usb1_vbus: regulator-usb1-vbus {
>>  >> >> > > +             compatible = "regulator-fixed";
>>  >> >> > > +             regulator-name = "usb1-vbus";
>>  >> >> > > +             regulator-min-microvolt = <5000000>;
>>  >> >> > > +             regulator-max-microvolt = <5000000>;
>>  >> >> > > +             vin-supply = <&reg_vcc5v>;
>>  >> >> > > +             enable-active-high;
>>  >> >> > > +             gpio = <&pio 2 16 GPIO_ACTIVE_HIGH>; /* 
>> PC16 */
>>  >> >> > > +     };
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&ehci1 {
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&ehci2 {
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&ehci3 {
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&mmc0 {
>>  >> >> > > +     vmmc-supply = <&reg_dldo1>;
>>  >> >> > > +     cd-gpios = <&pio 5 6 GPIO_ACTIVE_LOW>;  /* PF6 */
>>  >> >> > > +     no-1-8-v;
>>  >> >> > > +     bus-width = <4>;
>>  >> >> > > +     status = "disabled";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&ohci1 {
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&ohci2 {
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&ohci3 {
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&r_i2c {
>>  >> >> > > +     status = "okay";
>>  >> >> > > +
>>  >> >> > > +     axp1530: pmic@36 {
>>  >> >> > > +             compatible = "x-powers,axp1530";
>>  >> >> > > +             reg = <0x36>;
>>  >> >> > > +             wakeup-source;
>>  >> >> > > +
>>  >> >> > > +             regulators{
>>  >> >> > > +                     reg_dcdc1: dcdc1 {
>>  >> >> > > +                             regulator-name = 
>> "axp1530-dcdc1";
>>  >> >> > > +                             regulator-min-microvolt = 
>> <500000>;
>>  >> >> > > +                             regulator-max-microvolt = 
>> <3400000>;
>>  >> >> > > +                             regulator-step-delay-us = 
>> <25>;
>>  >> >> > > +                             regulator-final-delay-us = 
>> <50>;
>>  >> >> > > +                             regulator-always-on;
>>  >> >> > > +                     };
>>  >> >> > > +
>>  >> >> > > +                     reg_dcdc2: dcdc2 {
>>  >> >> > > +                             regulator-name = 
>> "axp1530-dcdc2";
>>  >> >> > > +                             regulator-min-microvolt = 
>> <500000>;
>>  >> >> > > +                             regulator-max-microvolt = 
>> <1540000>;
>>  >> >> > > +                             regulator-step-delay-us = 
>> <25>;
>>  >> >> > > +                             regulator-final-delay-us = 
>> <50>;
>>  >> >> > > +                             regulator-ramp-delay = 
>> <200>;
>>  >> >> > > +                             regulator-always-on;
>>  >> >> > > +                     };
>>  >> >> > > +
>>  >> >> > > +                     reg_dcdc3: dcdc3 {
>>  >> >> > > +                             regulator-name = 
>> "axp1530-dcdc3";
>>  >> >> > > +                             regulator-min-microvolt = 
>> <500000>;
>>  >> >> > > +                             regulator-max-microvolt = 
>> <1840000>;
>>  >> >> > > +                             regulator-step-delay-us = 
>> <25>;
>>  >> >> > > +                             regulator-final-delay-us = 
>> <50>;
>>  >> >> > > +                             regulator-always-on;
>>  >> >> > > +                     };
>>  >> >> > > +
>>  >> >> > > +                     reg_aldo1: ldo1 {
>>  >> >> > > +                             regulator-name = 
>> "axp1530-aldo1";
>>  >> >> > > +                             regulator-min-microvolt = 
>> <1800000>;
>>  >> >> > > +                             regulator-max-microvolt = 
>> <1800000>;
>>  >> >> > > +                             regulator-step-delay-us = 
>> <25>;
>>  >> >> > > +                             regulator-final-delay-us = 
>> <50>;
>>  >> >> > > +                             regulator-always-on;
>>  >> >> > > +                     };
>>  >> >> > > +
>>  >> >> > > +                     reg_dldo1: ldo2 {
>>  >> >> > > +                             regulator-name = 
>> "axp1530-dldo1";
>>  >> >> > > +                             regulator-min-microvolt = 
>> <3300000>;
>>  >> >> > > +                             regulator-max-microvolt = 
>> <3300000>;
>>  >> >> > > +                             regulator-step-delay-us = 
>> <25>;
>>  >> >> > > +                             regulator-final-delay-us = 
>> <50>;
>>  >> >> > > +                             regulator-always-on;
>>  >> >> > > +                     };
>>  >> >> > > +             };
>>  >> >> > > +     };
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&uart0 {
>>  >> >> > > +     pinctrl-names = "default";
>>  >> >> > > +     pinctrl-0 = <&uart0_ph_pins>;
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&usbotg {
>>  >> >> > > +     /*
>>  >> >> > > +      * PHY0 pins are connected to a USB-C socket, but a 
>> role switch
>>  >> >> > > +      * is not implemented: both CC pins are pulled to 
>> GND.
>>  >> >> > > +      * The VBUS pins power the device, so a fixed 
>> peripheral mode
>>  >> >> > > +      * is the best choice.
>>  >> >> > > +      * The board can be powered via GPIOs, in this case 
>> port0 *can*
>>  >> >> > > +      * act as a host (with a cable/adapter ignoring 
>> CC), as VBUS is
>>  >> >> > > +      * then provided by the GPIOs. Any user of this 
>> setup would
>>  >> >> > > +      * need to adjust the DT accordingly: dr_mode set 
>> to "host",
>>  >> >> > > +      * enabling OHCI0 and EHCI0.
>>  >> >> > > +      */
>>  >> >> > > +     dr_mode = "peripheral";
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> > > +
>>  >> >> > > +&usbphy {
>>  >> >> > > +     usb1_vbus-supply = <&reg_usb1_vbus>;
>>  >> >> > > +     status = "okay";
>>  >> >> > > +};
>>  >> >> >
>>  >> >> >
>>  >> >
>>  >
> 
And yes there should be CM4 and CB1 DT for these boards.
But since i do not own CM4. I will only create CB1 version of this DT.

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