Re: [PATCH 07/12] riscv: dts: allwinner: Add Allwinner D1 Nezha devicetree

From: Conor.Dooley
Date: Fri Aug 19 2022 - 18:11:02 EST

Hey Samuel,

Finally got around to giving this a go with the fix for loading
modules which is mostly what was blocking me before..

On 15/08/2022 06:08, Samuel Holland wrote:
> "D1 Nezha" is Allwinner's first-party development board for the D1 SoC.
> It was shipped with 512M, 1G, or 2G of DDR3. It supports onboard audio,

I am really not keen on the way you have things, with the memory
nodes removed from the device tree. I know your preferred flow
for booting these things might be to pass the dtb up from U-Boot,
but I think the devicetree in the kernel should be usable in a
standalone manner, even if that is the barest-minimum memory
config.

I did figure out all of my issues getting booted, thanks partly
to Heiko. The U-Boot dtb being misaligned was part of it as was
my initramfs with some stale sunxi modules in it causing RCU
stalls.. so sorry for the noise on that front (and thanks again
to Heiko!).

Modulo the memory node, since I had to hack that in to get things
working & I do not want to have to keep doing:
Tested-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

Thanks & apologies again for the modules-related issues - it was
hard to debug that one since module loading was broken on RISC-V
at the time.
Conor.

> HDMI, gigabit Ethernet, WiFi and Bluetooth, USB 2.0 host and OTG ports,
> plus low-speed I/O from the SoC and a GPIO expander chip.
>
> Most other D1 boards copied the Nezha's power tree, with the 1.8V rail
> powered by the SoCs internal LDOA, analog domains powered by ALDO, and
> the rest of the board powered by always-on fixed regulators. Some (but
> not all) boards also copied the PWM CPU regulator. To avoid duplication,
> factor out the out the regulator references that are common across all
> known boards.
>
> Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
> ---
>
> arch/riscv/boot/dts/allwinner/Makefile | 1 +
> .../sun20i-d1-common-regulators.dtsi | 51 ++++++
> .../boot/dts/allwinner/sun20i-d1-nezha.dts | 171 ++++++++++++++++++
> 3 files changed, 223 insertions(+)
> create mode 100644 arch/riscv/boot/dts/allwinner/sun20i-d1-common-regulators.dtsi
> create mode 100644 arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts
>
> diff --git a/arch/riscv/boot/dts/allwinner/Makefile b/arch/riscv/boot/dts/allwinner/Makefile
> index f66554cd5c45..b0a15e8c8d82 100644
> --- a/arch/riscv/boot/dts/allwinner/Makefile
> +++ b/arch/riscv/boot/dts/allwinner/Makefile
> @@ -1 +1,2 @@
> # SPDX-License-Identifier: GPL-2.0
> +dtb-$(CONFIG_ARCH_SUNXI) += sun20i-d1-nezha.dtb
> diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1-common-regulators.dtsi b/arch/riscv/boot/dts/allwinner/sun20i-d1-common-regulators.dtsi
> new file mode 100644
> index 000000000000..143a3e710c3c
> --- /dev/null
> +++ b/arch/riscv/boot/dts/allwinner/sun20i-d1-common-regulators.dtsi
> @@ -0,0 +1,51 @@
> +// SPDX-License-Identifier: (GPL-2.0+ or MIT)
> +// Copyright (C) 2021-2022 Samuel Holland <samuel@xxxxxxxxxxxx>
> +
> +/ {
> + reg_vcc: vcc {
> + compatible = "regulator-fixed";
> + regulator-name = "vcc";
> + regulator-min-microvolt = <5000000>;
> + regulator-max-microvolt = <5000000>;
> + };
> +
> + reg_vcc_3v3: vcc-3v3 {
> + compatible = "regulator-fixed";
> + regulator-name = "vcc-3v3";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3300000>;
> + vin-supply = <&reg_vcc>;
> + };
> +};
> +
> +&lradc {
> + vref-supply = <&reg_aldo>;
> +};
> +
> +&pio {
> + vcc-pb-supply = <&reg_vcc_3v3>;
> + vcc-pc-supply = <&reg_vcc_3v3>;
> + vcc-pd-supply = <&reg_vcc_3v3>;
> + vcc-pe-supply = <&reg_vcc_3v3>;
> + vcc-pf-supply = <&reg_vcc_3v3>;
> + vcc-pg-supply = <&reg_vcc_3v3>;
> +};
> +
> +&reg_aldo {
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + vdd33-supply = <&reg_vcc_3v3>;
> +};
> +
> +&reg_hpldo {
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + hpldoin-supply = <&reg_vcc_3v3>;
> +};
> +
> +&reg_ldoa {
> + regulator-always-on;
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + ldo-in-supply = <&reg_vcc_3v3>;
> +};
> diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts b/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts
> new file mode 100644
> index 000000000000..df865ee15fcf
> --- /dev/null
> +++ b/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts
> @@ -0,0 +1,171 @@
> +// SPDX-License-Identifier: (GPL-2.0+ or MIT)
> +// Copyright (C) 2021-2022 Samuel Holland <samuel@xxxxxxxxxxxx>
> +
> +/dts-v1/;
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/input/input.h>
> +
> +#include "sun20i-d1.dtsi"
> +#include "sun20i-d1-common-regulators.dtsi"
> +
> +/ {
> + model = "Allwinner D1 Nezha";
> + compatible = "allwinner,d1-nezha", "allwinner,sun20i-d1";
> +
> + aliases {
> + ethernet0 = &emac;
> + ethernet1 = &xr829;
> + mmc0 = &mmc0;
> + serial0 = &uart0;
> + };
> +
> + chosen {
> + stdout-path = "serial0:115200n8";
> + };
> +
> + reg_usbvbus: usbvbus {
> + compatible = "regulator-fixed";
> + regulator-name = "usbvbus";
> + regulator-min-microvolt = <5000000>;
> + regulator-max-microvolt = <5000000>;
> + gpio = <&pio 3 19 GPIO_ACTIVE_HIGH>; /* PD19 */
> + enable-active-high;
> + vin-supply = <&reg_vcc>;
> + };
> +
> + /*
> + * This regulator is PWM-controlled, but the PWM controller is not
> + * yet supported, so fix the regulator to its default voltage.
> + */
> + reg_vdd_cpu: vdd-cpu {
> + compatible = "regulator-fixed";
> + regulator-name = "vdd-cpu";
> + regulator-min-microvolt = <1100000>;
> + regulator-max-microvolt = <1100000>;
> + vin-supply = <&reg_vcc>;
> + };
> +
> + wifi_pwrseq: wifi-pwrseq {
> + compatible = "mmc-pwrseq-simple";
> + reset-gpios = <&pio 6 12 GPIO_ACTIVE_LOW>; /* PG12 */
> + };
> +};
> +
> +&cpu0 {
> + cpu-supply = <&reg_vdd_cpu>;
> +};
> +
> +&ehci0 {
> + status = "okay";
> +};
> +
> +&ehci1 {
> + status = "okay";
> +};
> +
> +&emac {
> + pinctrl-0 = <&rgmii_pe_pins>;
> + pinctrl-names = "default";
> + phy-handle = <&ext_rgmii_phy>;
> + phy-mode = "rgmii-id";
> + phy-supply = <&reg_vcc_3v3>;
> + status = "okay";
> +};
> +
> +&i2c2 {
> + pinctrl-0 = <&i2c2_pb0_pins>;
> + pinctrl-names = "default";
> + status = "okay";
> +
> + pcf8574a: gpio@38 {
> + compatible = "nxp,pcf8574a";
> + reg = <0x38>;
> + interrupt-parent = <&pio>;
> + interrupts = <1 2 IRQ_TYPE_LEVEL_LOW>; /* PB2 */
> + interrupt-controller;
> + gpio-controller;
> + #gpio-cells = <2>;
> + #interrupt-cells = <2>;
> + };
> +};
> +
> +&lradc {
> + status = "okay";
> +
> + button-160 {
> + label = "OK";
> + linux,code = <KEY_OK>;
> + channel = <0>;
> + voltage = <160000>;
> + };
> +};
> +
> +&mdio {
> + ext_rgmii_phy: ethernet-phy@1 {
> + compatible = "ethernet-phy-ieee802.3-c22";
> + reg = <1>;
> + };
> +};
> +
> +&mmc0 {
> + bus-width = <4>;
> + cd-gpios = <&pio 5 6 GPIO_ACTIVE_HIGH>; /* PF6 */
> + disable-wp;
> + vmmc-supply = <&reg_vcc_3v3>;
> + vqmmc-supply = <&reg_vcc_3v3>;
> + pinctrl-0 = <&mmc0_pins>;
> + pinctrl-names = "default";
> + status = "okay";
> +};
> +
> +&mmc1 {
> + bus-width = <4>;
> + mmc-pwrseq = <&wifi_pwrseq>;
> + non-removable;
> + vmmc-supply = <&reg_vcc_3v3>;
> + vqmmc-supply = <&reg_vcc_3v3>;
> + pinctrl-0 = <&mmc1_pins>;
> + pinctrl-names = "default";
> + status = "okay";
> +
> + xr829: wifi@1 {
> + reg = <1>;
> + };
> +};
> +
> +&ohci0 {
> + status = "okay";
> +};
> +
> +&ohci1 {
> + status = "okay";
> +};
> +
> +&uart0 {
> + pinctrl-0 = <&uart0_pb8_pins>;
> + pinctrl-names = "default";
> + status = "okay";
> +};
> +
> +&uart1 {
> + uart-has-rtscts;
> + pinctrl-0 = <&uart1_pg6_pins>, <&uart1_pg8_rts_cts_pins>;
> + pinctrl-names = "default";
> + status = "okay";
> +
> + /* XR829 bluetooth is connected here */
> +};
> +
> +&usb_otg {
> + dr_mode = "otg";
> + status = "okay";
> +};
> +
> +&usbphy {
> + usb0_id_det-gpios = <&pio 3 21 GPIO_ACTIVE_HIGH>; /* PD21 */
> + usb0_vbus_det-gpios = <&pio 3 20 GPIO_ACTIVE_HIGH>; /* PD20 */
> + usb0_vbus-supply = <&reg_usbvbus>;
> + usb1_vbus-supply = <&reg_vcc>;
> + status = "okay";
> +};