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Message-ID: <aMgXPPn3D3epmAua@probook>
Date: Mon, 15 Sep 2025 13:40:15 +0000
From: J. Neuschäfer <j.ne@...teo.net>
To: Andre Przywara <andre.przywara@....com>
Cc: J. Neuschäfer via B4 Relay <devnull+j.ne.posteo.net@...nel.org>,
j.ne@...teo.net, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
Maxime Ripard <mripard@...nel.org>, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: allwinner: h313: Add Amediatech X96Q
On Fri, Sep 12, 2025 at 10:54:49AM +0100, Andre Przywara wrote:
> On Fri, 12 Sep 2025 01:52:10 +0200
> J. Neuschäfer via B4 Relay <devnull+j.ne.posteo.net@...nel.org> wrote:
>
> Hi,
>
> many thanks for posting the DT, I really wish more people would do that!
>
> > From: "J. Neuschäfer" <j.ne@...teo.net>
> >
> > The X96Q is a set-top box with an H313 SoC, AXP305 PMIC, 1 or 2 GiB RAM,
> > 8 or 16 GiB eMMC flash, 2x USB A, Micro-SD, HDMI, Ethernet, audio/video
> > output, and infrared input.
> >
> > https://x96mini.com/products/x96q-tv-box-android-10-set-top-box
> >
> > Tested, works:
> > - debug UART
> > - status LED
> > - USB ports in host mode
> > - MicroSD
> > - eMMC
> > - recovery button hidden behind audio/video port
> > - analog audio (line out)
> >
> > Does not work:
> > - Ethernet (requires AC200 MFD/EPHY driver)
> > - analog video output (requires AC200 driver)
> > - HDMI audio/video output
> >
> > Untested:
> > - "OTG" USB port in device mode
> > - built-in IR receiver
> > - external IR receiver
> > - WLAN (requires out-of-tree XRadio driver)
> >
> > Table of regulators on the downstream kernel, for reference:
> >
> > vcc-5v 1 15 0 unknown 5000mV 0mA 5000mV 5000mV
> > dcdca 0 0 0 unknown 900mV 0mA 0mV 0mV
> > dcdcb 0 0 0 unknown 1350mV 0mA 0mV 0mV
> > dcdcc 0 0 0 unknown 900mV 0mA 0mV 0mV
> > dcdcd 0 0 0 unknown 1500mV 0mA 0mV 0mV
> > dcdce 0 0 0 unknown 3300mV 0mA 0mV 0mV
> > aldo1 0 0 0 unknown 3300mV 0mA 0mV 0mV
> > aldo2 0 0 0 unknown 700mV 0mA 0mV 0mV
> > aldo3 0 0 0 unknown 700mV 0mA 0mV 0mV
> > bldo1 0 0 0 unknown 1800mV 0mA 0mV 0mV
> > bldo2 0 0 0 unknown 1800mV 0mA 0mV 0mV
> > bldo3 0 0 0 unknown 700mV 0mA 0mV 0mV
> > bldo4 0 0 0 unknown 700mV 0mA 0mV 0mV
> > cldo1 0 0 0 unknown 2500mV 0mA 0mV 0mV
> > cldo2 0 0 0 unknown 700mV 0mA 0mV 0mV
> > cldo3 0 0 0 unknown 700mV 0mA 0mV 0mV
> >
> > Signed-off-by: J. Neuschäfer <j.ne@...teo.net>
> > ---
> > arch/arm64/boot/dts/allwinner/Makefile | 1 +
> > arch/arm64/boot/dts/allwinner/sun50i-h313-x96q.dts | 235 +++++++++++++++++++++
> > 2 files changed, 236 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/allwinner/Makefile b/arch/arm64/boot/dts/allwinner/Makefile
> > index 780aeba0f3a4e14d69c9602e37b8d299165507b9..2edfa7bf4ab31c4aa934da98e5e042edc9aaf600 100644
> > --- a/arch/arm64/boot/dts/allwinner/Makefile
> > +++ b/arch/arm64/boot/dts/allwinner/Makefile
> > @@ -41,6 +41,7 @@ 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-h313-tanix-tx1.dtb
> > +dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h313-x96q.dtb
> > dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h616-bigtreetech-cb1-manta.dtb
> > dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h616-bigtreetech-pi.dtb
> > dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h616-orangepi-zero2.dtb
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h313-x96q.dts b/arch/arm64/boot/dts/allwinner/sun50i-h313-x96q.dts
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..9534eb03b89557f2545af5af7cf43390be722cf0
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h313-x96q.dts
> > @@ -0,0 +1,235 @@
> > +// SPDX-License-Identifier: (GPL-2.0-or-later OR MIT)
> > +/*
> > + * Copyright (C) 2025 J. Neuschäfer <j.ne@...teo.net>
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include "sun50i-h616.dtsi"
> > +#include "sun50i-h616-cpu-opp.dtsi"
> > +
> > +#include <dt-bindings/gpio/gpio.h>
> > +#include <dt-bindings/interrupt-controller/arm-gic.h>
> > +#include <dt-bindings/input/linux-event-codes.h>
> > +#include <dt-bindings/leds/common.h>
> > +
> > +/ {
> > + model = "X96Q";
> > + compatible = "amediatech,x96q", "allwinner,sun50i-h616";
> > +
> > + aliases {
> > + mmc0 = &mmc0;
> > + mmc1 = &mmc1;
> > + mmc2 = &mmc2;
>
> We don't do mmc aliases in the upstream DTs. Long story, but you should
> not need them. I guess you want to disagree ;-),
I've seen mmc aliases before, and I've seen the annoying effects of an
unstable probe order, so this is mostly of thing of habit.
> in this case U-Boot has
> you covered, by adding the aliases during build time: just use
> $fdtcontroladdr, as you should do anyway.
I'm using a recent upstream U-Boot with a FIT image ('make image.fit' in
the Linux source tree). In this case U-Boot does not add mmc aliases.
Is there a special Kconfig option I need to enable in U-Boot?
What do you mean by 'build time'? U-Boot's?
>
> > + serial0 = &uart0;
> > + };
[...]
> > +&mmc0 {
> > + vmmc-supply = <®_aldo1>;
> > + cd-gpios = <&pio 5 6 GPIO_ACTIVE_LOW>; /* PF6 */
> > + disable-wp;
> > + bus-width = <4>;
> > + max-frequency = <150000000>;
>
> That line is already in the .dtsi file, so redundant.
Good point, removing.
>
> > + status = "okay";
> > + /* µSD */
>
> If we really need this comment, it should be above, right after the
> "&mmc0 {". And I wonder if it should be "microSD" instead.
Good points, I'll do both.
> > +};
> > +
> > +&mmc1 {
> > + /* TODO: XRadio XR819 WLAN */
>
> Either you just keep the comment, an mention mmc1, but don't reference the
> node, or you add the properties that you know of already, like
> vmmc-supply, vqmmc-supply, mmc-pwrseq, bus-width, non-removable.
> But this "empty reference with a comment" is somewhat odd.
I'll change it to a pure comment for now.
> > +};
> > +
> > +&mmc2 {
> > + vmmc-supply = <®_aldo1>;
> > + vqmmc-supply = <®_bldo1>;
> > + non-removable;
> > + cap-mmc-hw-reset;
> > + mmc-ddr-1_8v;
> > + mmc-hs200-1_8v;
> > + bus-width = <8>;
> > + max-frequency = <100000000>;
>
> Are you sure you need that?
I found it in the downstream DT. The eMMC probes fine without it, so
I'll remove it. The eMMC datasheet (assuming I found the right one),
claims a maximum of 200 MHz, so the 100 MHz restriction seems
unnecessary.
>
> > + status = "okay";
> > + /* eMMC */
>
> Please move that comment up.
Will do.
[...]
> > + regulators {
> > + reg_dcdca: dcdca {
> > + regulator-always-on;
> > + regulator-min-microvolt = <810000>;
> > + regulator-max-microvolt = <1100000>;
> > + regulator-name = "vdd-cpu";
> > + };
> > +
> > + dcdcb {
> > + /* unused */
> > + };
> > +
> > + reg_dcdcc: dcdcc {
> > + regulator-always-on;
> > + regulator-min-microvolt = <810000>;
> > + regulator-max-microvolt = <990000>;
> > + regulator-name = "vdd-gpu-sys";
> > + };
> > +
> > + dcdcd {
> > + regulator-always-on;
>
> Why is this always on? What happens if you remove that line or turn it off?
> For always-on regulators we either need a comment saying why, or, better,
> have an explanatory regulator-name (like above).
> Is that for DRAM, by any chance (1.5V for DDR3 chips)?
The observed behavior is that the system halts when dcdcd is disabled.
The relationship is a bit hard to determine without schematics, but the
DDR3 chips (Micron MT41J256M4) do indeed use 1.5V. Since this is the
only source of 1.5V, I think it's a safe guess that this is indeed the
DRAM regulator.
>
> Cheers,
> Andre
Thanks for the review!
J. Neuschäfer
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