Re: [PATCH v3 2/2] arm64: dts: Add basic support for BIQU CB1

[Jernej Škrabec]

Dne ponedeljek, 14. november 2022 ob 23:54:46 CET je Martin Botka napisal(a):
> On Mon, Nov 14 2022 at 11:30:17 PM +01:00:00, Jernej Škrabec
> 
> <jernej.skrabec@xxxxxxxxx> wrote:
> > Hi Martin,
> > 
> > I was just writing new e-mail as response to v2. You should wait at
> > least a
> > day or two, usually more, before sending new version. Others will
> > likely have
> > some more comments. And there is also no rush. Until PMIC series is
> > merged,
> > this will not go anywhere. Since there is only this week until cut
> > off date for
> > DT updates for kernel 6.2, it's most likely that this will land in
> > 6.3. And
> > that gives as a few weeks (month) more.
> 
> Yep. Was hoping for 5.2 thus the frequent updates. Will take it slow
> then since 5.3 :)

You're way too late for 5.x series :) Anyway, 6.2 would be possible if you 
would have almost flawless patch with no additional dependencies, but that is 
not the case here. I'll send DT pull requests for 6.2 at the end of this week.

Best regards,
Jernej

> 
> > See comments below.
> > 
> > Dne ponedeljek, 14. november 2022 ob 22:44:49 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.
> > 
> > H616 has only one HDMI output. Unless there is some additional chip
> > for some
> > conversion, only one HDMI port can work.
> 
> Yes correct. But the Rpi adapter and Manta boards also support
> Rpi Compute Module 4 which has 2 HDMI outputs.
> The chip itself ofc doesnt support this on CB1. Same goes for DSI/CSI
> ports
> on the boards and the 4x USB on Rpi adapter.
> 
> It is indeed a bit of a mess.
> 
> >>  	Power and Status LEDs.
> >>  
> >>  Currently working:
> >>  	Booting
> >>  	USB
> >>  	UART
> >>  
> >>  Signed-off-by: Martin Botka <martin.botka@xxxxxxxxxxxxxx>
> >>  ---
> >>  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@xxxxxxxxxxxxxx>.
> >>  + */
> >>  +
> >>  +/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;
> > 
> > Above property is not needed. If you don't provide vqmmc-supply with
> > 1.8 V
> > regulator, it won't be used.
> > 
> >>  +	bus-width = <4>;
> >>  +	status = "disabled";
> > 
> > Why is set to disabled? If it's not a typo, remove whole node. It
> > could be
> > added later when it works.
> 
> Would not removing it also make PMIC node useless as the regulators
> wont be used and thus
> should be technically removed ?
> 
> >>  +};
> >>  +
> >>  +&ohci1 {
> >>  +	status = "okay";
> >>  +};
> >>  +
> >>  +&ohci2 {
> >>  +	status = "okay";
> >>  +};
> >>  +
> >>  +&ohci3 {
> >>  +	status = "okay";
> >>  +};
> >>  +
> >>  +&r_i2c {
> >>  +	status = "okay";
> >>  +
> >>  +	axp1530: pmic@36 {
> >>  +		compatible = "x-powers,axp1530";
> > 
> > I just checked datasheet and it really seems that it supports only
> > I2C.
> > Anyway, rather than using axp1530 compatible, introduce axp313a
> > compatible
> > instead.
> 
> Will do in V2 for drivers later.
> 
> >>  +		reg = <0x36>;
> >>  +		wakeup-source;
> >>  +
> >>  +		regulators{
> >>  +			reg_dcdc1: dcdc1 {
> >>  +				regulator-name = "axp1530-
dcdc1";
> >>  +				regulator-min-microvolt =
> > 
> > <500000>;
> > 
> >>  +				regulator-max-microvolt =
> > 
> > <3400000>;
> > 
> > This one is most likely used by CPU. If so, you should set
> > appropriate range
> > according to CPU needs, which are 810 - 1100 mV.
> > 
> >>  +				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>;
> > 
> > This one is most likely used by GPU. Its range must also be adjusted
> > to GPU
> > needs.
> > 
> >>  +				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>;
> > 
> > This one looks like it supplies DRAM. You should set both min and max
> > to
> > actual DRAM needs.
> > 
> >>  +				regulator-step-delay-us = <25>;
> >>  +				regulator-final-delay-us = <50>;
> >>  +				regulator-always-on;
> >>  +			};
> >>  +
> >>  +			reg_aldo1: ldo1 {
> > 
> > ldo1 -> aldo1
> > 
> >>  +				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 {
> > 
> > ldo2 -> dldo1
> > 
> > Another issue I see is that you marked all regulators with
> > regulator-always-
> > on; While this works, I don't think this faithfully represent HW. For
> > example,
> > GPU regulator will be enabled by GPU driver when needed, so it
> > shouldn't be
> > marked with always on.
> > 
> > There is also RTCLDO, but without schematic it's impossible to say if
> > it is
> > used or not.
> > 
> > There are at least a few clues in AXP313A datasheet about which
> > regulator is
> > used for what. See chapter 7.5 in
> > https://github.com/bigtreetech/CB1-Kernel/
> > blob/kernel-5.16/docs/AXP313A%20datasheet%20V0.1%20-
> > %2020201105_draft%20version.pdf
> 
> As for regulators themselves. I have kept them as what downstream
> kernel specifies.
> But until I have schematic in hand and can confirm that they actually
> used the correct regulators in
> the correct place i will stick to stock values. If they in the end
> decide to not supply schematic or etc
> to the public i can test with adjusted values.
> 
> > Best regards,
> > Jernej
> > 
> >>  +				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";
> >>  +};
> 
> Best Regards,
> Martin