Re: [PATCH V2 2/2] arm64: dts: Add basic support for BIQU CB1

[Martin Botka <martin.botka@somainline.org>]

On Mon, Nov 14 2022 at 09:47:58 PM +01:00:00, Jernej Škrabec 
<jernej.skrabec@gmail.com> wrote:
> Dne ponedeljek, 14. november 2022 ob 21:38:08 CET je Martin Botka 
> napisal(a):
>>  On Mon, Nov 14 2022 at 09:16:29 PM +01:00:00, Jernej Škrabec
>> 
>>  <jernej.skrabec@gmail.com> wrote:
>>  > Hi Martin,
>>  >
>>  > Dne ponedeljek, 14. november 2022 ob 18:20:16 CET je Martin Botka
>>  >
>>  > napisal(a):
>>  >>  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.
>>  >>
>>  >>  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@somainline.org>
>>  >>  ---
>>  >>  Changes in V2:
>>  >>  Add proper board compatible
>>  >>  Add regulator prefix for vcc5v
>>  >>  Drop okay status from PMIC
>>  >>  Drop standby_param
>>  >>
>>  >>   arch/arm64/boot/dts/allwinner/Makefile        |   1 +
>>  >>   .../dts/allwinner/sun50i-h616-biqu-cb1.dts    | 186
>>  >>
>>  >> ++++++++++++++++++
>>  >>
>>  >>   2 files changed, 187 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..297536d7629a
>>  >>  --- /dev/null
>>  >>  +++ b/arch/arm64/boot/dts/allwinner/sun50i-h616-biqu-cb1.dts
>>  >>  @@ -0,0 +1,186 @@
>>  >>  +// SPDX-License-Identifier: (GPL-2.0+ or MIT)
>>  >>  +/*
>>  >>  + * Copyright (C) 2022 Arm Ltd.
>>  >
>>  > I suppose Arm Ltd. has nothing to do with this board? Put yours
>>  > copyrights
>>  > there.
>> 
>>  Correct. Was a left over from Opi Zero 2 with just changed year. 
>> Will
>>  correct in V3 with the rest of the changes
>> 
>>  >>  + */
>>  >>  +
>>  >>  +/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 */
>>  >>  +	};
>>  >>  +};
>>  >>  +
>>  >>  +&ehci0 {
>>  >>  +	status = "okay";
>>  >>  +};
>>  >>  +
>>  >>  +&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";
>>  >>  +};
>>  >>  +
>>  >>  +&ohci0 {
>>  >>  +	status = "okay";
>>  >>  +};
>>  >>  +
>>  >>  +&ohci1 {
>>  >>  +	status = "okay";
>>  >>  +};
>>  >>  +
>>  >>  +&ohci2 {
>>  >>  +	status = "okay";
>>  >>  +};
>>  >>  +
>>  >>  +&ohci3 {
>>  >>  +	status = "okay";
>>  >>  +};
>>  >>  +
>>  >>  +&r_i2c {
>>  >>  +	status = "okay";
>>  >>  +
>>  >>  +	axp1530: pmic@36 {
>>  >>  +		compatible = "x-powers,axp1530";
>>  >
>>  > I see that you send driver for this PMIC separately. Next time 
>> please
>>  > mention
>>  > that this series depends on another, otherwise checks will fail. 
>> Ping
>>  > us here
>>  > once PMIC driver is merged to unblock this.
>>  >
>>  > Anyway, RSB is prefered. Can you switch to it?
>> 
>>  RSB does initialize but as soon as I try to give it the PMIC via 
>> RSB it
>>  doesnt really wanna work so thats a no sadly.
> 
> It's possible that you have to update this table:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/
> drivers/bus/sunxi-rsb.c?h=v6.1-rc5#n528
> 
> If still doesn't work, you have to remove RSB support in PMIC driver.
> 
> Is there datasheet for this PMIC?
 From what i tried to find there isnt. Maybe i did not look hard enough 
but i do not have one.
All i go from here is the downstream kernel.
Biqu itself released datasheets for AXP305 and AXP313A. Where the 
AXP313A is actually used on the board
and uses the AXP1530 driver thats found in downstream which did include 
RSB support.
So it looks like to me that AXP313A is just a rebrand of AXP1530. And 
all other references to downstream
kernels i found about AXP1530 or AXP313A used I2C to communicate with 
the chip.
So in this state i would be happy to drop the RSB support from the 
driver as there seems to be no use for it and leave I2C in.
This would be done in V2 alongside any other requested changes
> 
> Best regards,
> Jernej
> 
>> 
>>  >>  +		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.
>>  >>  +	 */
>>  >
>>  > Above text is verbatim copy from OrangePi Zero2 and I'm not sure 
>> if
>>  > it is
>>  > fully accurate for this board too. Looking at board photo, it 
>> surely
>>  > looks
>>  > like this board has same USB design as Zero2. But if that's true, 
>> you
>>  > shouldn't enable OHCI0 and EHCI0 nodes.
>> 
>>  Correct. But M8P has a dip switch that enables or disables usbotg.
>>  As for if it does anything its hard to say.
>> 
>>  > Is there any board schematic publicly available for this board?
>> 
>>  This is one of the issues. Im in contact with BIQU and asking for 
>> the
>>  schematics.
>>  I hope we can get them released ASAP as it would help me as well.
>> 
>>  > Best regards,
>>  > Jernej
>>  >
>>  >>  +	dr_mode = "peripheral";
>>  >>  +	status = "okay";
>>  >>  +};
>>  >>  +
>>  >>  +&usbphy {
>>  >>  +	usb1_vbus-supply = <&reg_usb1_vbus>;
>>  >>  +	status = "okay";
>>  >>  +};
>> 
>>  Best Regards,
>>  Martin
> 
> 
> 
> 



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