LinuxLists.cc - [PATCH v2 0/2] arm64: amlogic: Add initial support for BPI-CM4 module with BPI-CM4IO baseboard

2023-03-06 08:32:04

Subject: [PATCH v2 0/2] arm64: amlogic: Add initial support for BPI-CM4 module with BPI-CM4IO baseboard

2023-03-06 08:32:04

Subject: [PATCH v2 2/2] arm64: dts: amlogic: Add initial support for BPI-CM4 module with BPI-CM4IO baseboard

Add support for both the BananaPi BPI-CM4 module and the BananaPi
baseboard which is comnpatible with the RaspberryPi CM4IO baseboard.

The BananaPi BPI-CM4 module follows the CM4 specifications at [1],
but with a single HDMI port and a since DSI output.

The current CM4IO baseboard DT should work fine on the Raspberry CM4
baseboard and other derivatives baseboards, but proper DT should
be written for other baseboards.

The split is done so it's easy to describe a new CM4 baseboard, enabling
only the necessary HW used on the baseboard.

[1] https://datasheets.raspberrypi.com/cm4io/cm4io-datasheet.pdf

Tested-by: Christian Hewitt <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
---
arch/arm64/boot/dts/amlogic/Makefile | 1 +
.../dts/amlogic/meson-g12b-bananapi-cm4-cm4io.dts | 165 +++++++++
.../boot/dts/amlogic/meson-g12b-bananapi-cm4.dtsi | 388 +++++++++++++++++++++
3 files changed, 554 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/Makefile b/arch/arm64/boot/dts/amlogic/Makefile
index ccf1ba57fa87..7acce22434a8 100644
--- a/arch/arm64/boot/dts/amlogic/Makefile
+++ b/arch/arm64/boot/dts/amlogic/Makefile
@@ -9,6 +9,7 @@ dtb-$(CONFIG_ARCH_MESON) += meson-g12a-sei510.dtb
dtb-$(CONFIG_ARCH_MESON) += meson-g12a-u200.dtb
dtb-$(CONFIG_ARCH_MESON) += meson-g12a-x96-max.dtb
dtb-$(CONFIG_ARCH_MESON) += meson-g12b-a311d-khadas-vim3.dtb
+dtb-$(CONFIG_ARCH_MESON) += meson-g12b-bananapi-cm4-cm4io.dtb
dtb-$(CONFIG_ARCH_MESON) += meson-g12b-gsking-x.dtb
dtb-$(CONFIG_ARCH_MESON) += meson-g12b-gtking-pro.dtb
dtb-$(CONFIG_ARCH_MESON) += meson-g12b-gtking.dtb
diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-bananapi-cm4-cm4io.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-bananapi-cm4-cm4io.dts
new file mode 100644
index 000000000000..1b0c3881c6a1
--- /dev/null
+++ b/arch/arm64/boot/dts/amlogic/meson-g12b-bananapi-cm4-cm4io.dts
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2023 Neil Armstrong <[email protected]>
+ */
+
+/dts-v1/;
+
+#include "meson-g12b-bananapi-cm4.dtsi"
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+#include <dt-bindings/sound/meson-g12a-tohdmitx.h>
+
+/ {
+ compatible = "bananapi,bpi-cm4io", "bananapi,bpi-cm4", "amlogic,a311d", "amlogic,g12b";
+ model = "BananaPi BPI-CM4IO Baseboard with BPI-CM4 Module";
+
+ aliases {
+ ethernet0 = &ethmac;
+ i2c0 = &i2c1;
+ i2c1 = &i2c3;
+ };
+
+ adc-keys {
+ compatible = "adc-keys";
+ io-channels = <&saradc 2>;
+ io-channel-names = "buttons";
+ keyup-threshold-microvolt = <1710000>;
+
+ button-function {
+ label = "Function";
+ linux,code = <KEY_FN>;
+ press-threshold-microvolt = <10000>;
+ };
+ };
+
+ hdmi_connector: hdmi-connector {
+ compatible = "hdmi-connector";
+ type = "a";
+
+ port {
+ hdmi_connector_in: endpoint {
+ remote-endpoint = <&hdmi_tx_tmds_out>;
+ };
+ };
+ };
+
+ leds {
+ compatible = "gpio-leds";
+
+ led-blue {
+ color = <LED_COLOR_ID_BLUE>;
+ function = LED_FUNCTION_STATUS;
+ gpios = <&gpio_ao GPIOAO_7 GPIO_ACTIVE_HIGH>;
+ linux,default-trigger = "heartbeat";
+ };
+
+ led-green {
+ color = <LED_COLOR_ID_GREEN>;
+ function = LED_FUNCTION_STATUS;
+ gpios = <&gpio_ao GPIOAO_2 GPIO_ACTIVE_HIGH>;
+ };
+ };
+
+ sound {
+ compatible = "amlogic,axg-sound-card";
+ model = "BPI-CM4IO";
+ audio-aux-devs = <&tdmout_b>;
+ audio-routing = "TDMOUT_B IN 0", "FRDDR_A OUT 1",
+ "TDMOUT_B IN 1", "FRDDR_B OUT 1",
+ "TDMOUT_B IN 2", "FRDDR_C OUT 1",
+ "TDM_B Playback", "TDMOUT_B OUT";
+
+ assigned-clocks = <&clkc CLKID_MPLL2>,
+ <&clkc CLKID_MPLL0>,
+ <&clkc CLKID_MPLL1>;
+ assigned-clock-parents = <0>, <0>, <0>;
+ assigned-clock-rates = <294912000>,
+ <270950400>,
+ <393216000>;
+
+ dai-link-0 {
+ sound-dai = <&frddr_a>;
+ };
+
+ dai-link-1 {
+ sound-dai = <&frddr_b>;
+ };
+
+ dai-link-2 {
+ sound-dai = <&frddr_c>;
+ };
+
+ /* 8ch hdmi interface */
+ dai-link-3 {
+ sound-dai = <&tdmif_b>;
+ dai-format = "i2s";
+ dai-tdm-slot-tx-mask-0 = <1 1>;
+ dai-tdm-slot-tx-mask-1 = <1 1>;
+ dai-tdm-slot-tx-mask-2 = <1 1>;
+ dai-tdm-slot-tx-mask-3 = <1 1>;
+ mclk-fs = <256>;
+
+ codec {
+ sound-dai = <&tohdmitx TOHDMITX_I2S_IN_B>;
+ };
+ };
+
+ /* hdmi glue */
+ dai-link-4 {
+ sound-dai = <&tohdmitx TOHDMITX_I2S_OUT>;
+
+ codec {
+ sound-dai = <&hdmi_tx>;
+ };
+ };
+ };
+};
+
+&cecb_AO {
+ status = "okay";
+};
+
+&ethmac {
+ status = "okay";
+};
+
+&hdmi_tx {
+ status = "okay";
+};
+
+&hdmi_tx_tmds_port {
+ hdmi_tx_tmds_out: endpoint {
+ remote-endpoint = <&hdmi_connector_in>;
+ };
+};
+
+/* CSI port */
+&i2c1 {
+ status = "okay";
+};
+
+/* DSI port for touchscreen */
+&i2c3 {
+ status = "okay";
+};
+
+/* miniPCIe port with USB + SIM slot */
+&pcie {
+ status = "okay";
+};
+
+&sd_emmc_b {
+ status = "okay";
+};
+
+&tohdmitx {
+ status = "okay";
+};
+
+/* Peripheral Only USB-C port */
+&usb {
+ dr_mode = "peripheral";
+
+ status = "okay";
+};
diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-bananapi-cm4.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12b-bananapi-cm4.dtsi
new file mode 100644
index 000000000000..97e522921b06
--- /dev/null
+++ b/arch/arm64/boot/dts/amlogic/meson-g12b-bananapi-cm4.dtsi
@@ -0,0 +1,388 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2023 Neil Armstrong <[email protected]>
+ */
+
+#include "meson-g12b-a311d.dtsi"
+#include <dt-bindings/gpio/meson-g12a-gpio.h>
+
+/ {
+ aliases {
+ serial0 = &uart_AO;
+ rtc1 = &vrtc;
+ };
+
+ chosen {
+ stdout-path = "serial0:115200n8";
+ };
+
+ emmc_pwrseq: emmc-pwrseq {
+ compatible = "mmc-pwrseq-emmc";
+ reset-gpios = <&gpio BOOT_12 GPIO_ACTIVE_LOW>;
+ };
+
+ memory@0 {
+ device_type = "memory";
+ reg = <0x0 0x0 0x0 0x40000000>;
+ };
+
+ sdio_pwrseq: sdio-pwrseq {
+ compatible = "mmc-pwrseq-simple";
+ reset-gpios = <&gpio GPIOAO_6 GPIO_ACTIVE_LOW>;
+ clocks = <&wifi32k>;
+ clock-names = "ext_clock";
+ };
+
+ emmc_1v8: regulator-emmc-1v8 {
+ compatible = "regulator-fixed";
+ regulator-name = "EMMC_1V8";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ vin-supply = <&vddao_3v3>;
+ regulator-always-on;
+ };
+
+ dc_in: regulator-dc-in {
+ compatible = "regulator-fixed";
+ regulator-name = "DC_IN";
+ regulator-min-microvolt = <5000000>;
+ regulator-max-microvolt = <5000000>;
+ regulator-always-on;
+ };
+
+ vddio_c: regulator-vddio-c {
+ compatible = "regulator-gpio";
+ regulator-name = "VDDIO_C";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <3300000>;
+
+ enable-gpio = <&gpio_ao GPIOAO_3 GPIO_OPEN_DRAIN>;
+ enable-active-high;
+ regulator-always-on;
+
+ gpios = <&gpio_ao GPIOAO_9 GPIO_OPEN_DRAIN>;
+ gpios-states = <1>;
+
+ states = <1800000 0>,
+ <3300000 1>;
+ };
+
+ vddao_1v8: regulator-vddao-1v8 {
+ compatible = "regulator-fixed";
+ regulator-name = "VDDAO_1V8";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ vin-supply = <&vddao_3v3>;
+ regulator-always-on;
+ };
+
+ vddao_3v3: regulator-vddao-3v3 {
+ compatible = "regulator-fixed";
+ regulator-name = "VDDAO_3V3";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ vin-supply = <&dc_in>;
+ regulator-always-on;
+ };
+
+ vddcpu_a: regulator-vddcpu-a {
+ /*
+ * MP8756GD DC/DC Regulator.
+ */
+ compatible = "pwm-regulator";
+
+ regulator-name = "VDDCPU_A";
+ regulator-min-microvolt = <680000>;
+ regulator-max-microvolt = <1040000>;
+
+ pwm-supply = <&dc_in>;
+
+ pwms = <&pwm_ab 0 1250 0>;
+ pwm-dutycycle-range = <100 0>;
+
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ vddcpu_b: regulator-vddcpu-b {
+ /*
+ * SY8120B1ABC DC/DC Regulator.
+ */
+ compatible = "pwm-regulator";
+
+ regulator-name = "VDDCPU_B";
+ regulator-min-microvolt = <680000>;
+ regulator-max-microvolt = <1040000>;
+
+ pwm-supply = <&dc_in>;
+
+ pwms = <&pwm_AO_cd 1 1250 0>;
+ pwm-dutycycle-range = <100 0>;
+
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ wifi32k: wifi32k {
+ compatible = "pwm-clock";
+ #clock-cells = <0>;
+ clock-frequency = <32768>;
+ pwms = <&pwm_ef 0 30518 0>; /* PWM_E at 32.768KHz */
+ };
+};
+
+&arb {
+ status = "okay";
+};
+
+&clkc_audio {
+ status = "okay";
+};
+
+&cec_AO {
+ pinctrl-0 = <&cec_ao_a_h_pins>;
+ pinctrl-names = "default";
+ hdmi-phandle = <&hdmi_tx>;
+};
+
+&cecb_AO {
+ pinctrl-0 = <&cec_ao_b_h_pins>;
+ pinctrl-names = "default";
+ hdmi-phandle = <&hdmi_tx>;
+};
+
+&cpu0 {
+ cpu-supply = <&vddcpu_b>;
+ operating-points-v2 = <&cpu_opp_table_0>;
+ clocks = <&clkc CLKID_CPU_CLK>;
+ clock-latency = <50000>;
+};
+
+&cpu1 {
+ cpu-supply = <&vddcpu_b>;
+ operating-points-v2 = <&cpu_opp_table_0>;
+ clocks = <&clkc CLKID_CPU_CLK>;
+ clock-latency = <50000>;
+};
+
+&cpu100 {
+ cpu-supply = <&vddcpu_a>;
+ operating-points-v2 = <&cpub_opp_table_1>;
+ clocks = <&clkc CLKID_CPUB_CLK>;
+ clock-latency = <50000>;
+};
+
+&cpu101 {
+ cpu-supply = <&vddcpu_a>;
+ operating-points-v2 = <&cpub_opp_table_1>;
+ clocks = <&clkc CLKID_CPUB_CLK>;
+ clock-latency = <50000>;
+};
+
+&cpu102 {
+ cpu-supply = <&vddcpu_a>;
+ operating-points-v2 = <&cpub_opp_table_1>;
+ clocks = <&clkc CLKID_CPUB_CLK>;
+ clock-latency = <50000>;
+};
+
+&cpu103 {
+ cpu-supply = <&vddcpu_a>;
+ operating-points-v2 = <&cpub_opp_table_1>;
+ clocks = <&clkc CLKID_CPUB_CLK>;
+ clock-latency = <50000>;
+};
+
+&ext_mdio {
+ external_phy: ethernet-phy@0 {
+ /* Realtek RTL8211F (0x001cc916) */
+ reg = <0>;
+ max-speed = <1000>;
+
+ interrupt-parent = <&gpio_intc>;
+ /* MAC_INTR on GPIOZ_14 */
+ interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
+ };
+};
+
+/* Ethernet to be enabled in baseboard DT */
+&ethmac {
+ pinctrl-0 = <&eth_pins>, <&eth_rgmii_pins>;
+ pinctrl-names = "default";
+ phy-mode = "rgmii-txid";
+ phy-handle = <&external_phy>;
+};
+
+&frddr_a {
+ status = "okay";
+};
+
+&frddr_b {
+ status = "okay";
+};
+
+&frddr_c {
+ status = "okay";
+};
+
+/* HDMI to be enabled in baseboard DT */
+&hdmi_tx {
+ pinctrl-0 = <&hdmitx_hpd_pins>, <&hdmitx_ddc_pins>;
+ pinctrl-names = "default";
+ hdmi-supply = <&dc_in>;
+};
+
+/* "Camera" I2C bus */
+&i2c1 {
+ pinctrl-0 = <&i2c1_sda_h6_pins>, <&i2c1_sck_h7_pins>;
+ pinctrl-names = "default";
+};
+
+/* Main I2C bus */
+&i2c2 {
+ pinctrl-0 = <&i2c2_sda_x_pins>, <&i2c2_sck_x_pins>;
+ pinctrl-names = "default";
+};
+
+/* "ID" I2C bus */
+&i2c3 {
+ pinctrl-0 = <&i2c3_sda_a_pins>, <&i2c3_sck_a_pins>;
+ pinctrl-names = "default";
+};
+
+&pcie {
+ reset-gpios = <&gpio GPIOA_8 GPIO_ACTIVE_LOW>;
+};
+
+&pwm_ab {
+ pinctrl-0 = <&pwm_a_e_pins>;
+ pinctrl-names = "default";
+ clocks = <&xtal>;
+ clock-names = "clkin0";
+
+ status = "okay";
+};
+
+&pwm_ef {
+ pinctrl-0 = <&pwm_e_pins>;
+ pinctrl-names = "default";
+
+ status = "okay";
+};
+
+&pwm_AO_cd {
+ pinctrl-0 = <&pwm_ao_d_e_pins>;
+ pinctrl-names = "default";
+ clocks = <&xtal>;
+ clock-names = "clkin1";
+
+ status = "okay";
+};
+
+&saradc {
+ vref-supply = <&vddao_1v8>;
+
+ status = "okay";
+};
+
+/* on-module SDIO WiFi */
+&sd_emmc_a {
+ pinctrl-0 = <&sdio_pins>;
+ pinctrl-1 = <&sdio_clk_gate_pins>;
+ pinctrl-names = "default", "clk-gate";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ bus-width = <4>;
+ sd-uhs-sdr104;
+ max-frequency = <50000000>;
+
+ non-removable;
+ disable-wp;
+
+ /* WiFi firmware requires power in suspend */
+ keep-power-in-suspend;
+
+ mmc-pwrseq = <&sdio_pwrseq>;
+
+ vmmc-supply = <&vddao_3v3>;
+ vqmmc-supply = <&vddao_3v3>;
+
+ status = "okay";
+
+ rtl8822cs: wifi@1 {
+ reg = <1>;
+ };
+};
+
+/* SD card to be enabled in baseboard DT */
+&sd_emmc_b {
+ pinctrl-0 = <&sdcard_c_pins>;
+ pinctrl-1 = <&sdcard_clk_gate_c_pins>;
+ pinctrl-names = "default", "clk-gate";
+
+ bus-width = <4>;
+ cap-sd-highspeed;
+ max-frequency = <50000000>;
+ disable-wp;
+
+ cd-gpios = <&gpio GPIOC_6 GPIO_ACTIVE_LOW>;
+ vmmc-supply = <&vddao_3v3>;
+ vqmmc-supply = <&vddio_c>;
+};
+
+/* on-module eMMC */
+&sd_emmc_c {
+ pinctrl-0 = <&emmc_ctrl_pins>, <&emmc_data_8b_pins>, <&emmc_ds_pins>;
+ pinctrl-1 = <&emmc_clk_gate_pins>;
+ pinctrl-names = "default", "clk-gate";
+
+ bus-width = <8>;
+ cap-mmc-highspeed;
+ mmc-ddr-1_8v;
+ mmc-hs200-1_8v;
+ max-frequency = <200000000>;
+ disable-wp;
+
+ mmc-pwrseq = <&emmc_pwrseq>;
+ vmmc-supply = <&vddao_3v3>;
+ vqmmc-supply = <&vddao_1v8>;
+
+ status = "okay";
+};
+
+&tdmif_b {
+ status = "okay";
+};
+
+&tdmout_b {
+ status = "okay";
+};
+
+/* on-module UART BT */
+&uart_A {
+ pinctrl-0 = <&uart_a_pins>, <&uart_a_cts_rts_pins>;
+ pinctrl-names = "default";
+ uart-has-rtscts;
+
+ status = "okay";
+
+ bluetooth {
+ compatible = "realtek,rtl8822cs-bt";
+ enable-gpios = <&gpio GPIOX_17 GPIO_ACTIVE_HIGH>;
+ host-wake-gpios = <&gpio GPIOX_19 GPIO_ACTIVE_HIGH>;
+ device-wake-gpios = <&gpio GPIOX_18 GPIO_ACTIVE_HIGH>;
+ };
+};
+
+&uart_AO {
+ pinctrl-0 = <&uart_ao_a_pins>;
+ pinctrl-names = "default";
+
+ status = "okay";
+};
+
+&usb {
+ phys = <&usb2_phy0>, <&usb2_phy1>;
+ phy-names = "usb2-phy0", "usb2-phy1";
+};

--
2.34.1

2023-03-06 22:12:17

by Martin Blumenstingl

[permalink] [raw]

Subject: Re: [PATCH v2 2/2] arm64: dts: amlogic: Add initial support for BPI-CM4 module with BPI-CM4IO baseboard

Hi Neil,

On Mon, Mar 6, 2023 at 9:31 AM Neil Armstrong <[email protected]> wrote:
>
> Add support for both the BananaPi BPI-CM4 module and the BananaPi
> baseboard which is comnpatible with the RaspberryPi CM4IO baseboard.
s/comnpatible/compatible/

>
> The BananaPi BPI-CM4 module follows the CM4 specifications at [1],
> but with a single HDMI port and a since DSI output.
s/since/single/

>
> The current CM4IO baseboard DT should work fine on the Raspberry CM4
> baseboard and other derivatives baseboards, but proper DT should
> be written for other baseboards.
>
> The split is done so it's easy to describe a new CM4 baseboard, enabling
> only the necessary HW used on the baseboard.
>
> [1] https://datasheets.raspberrypi.com/cm4io/cm4io-datasheet.pdf
>
> Tested-by: Christian Hewitt <[email protected]>
> Signed-off-by: Neil Armstrong <[email protected]>
With the typos above fixed:
Reviewed-by: Martin Blumenstingl <[email protected]>

[...]
> +&ext_mdio {
> + external_phy: ethernet-phy@0 {
> + /* Realtek RTL8211F (0x001cc916) */
> + reg = <0>;
> + max-speed = <1000>;
> +
> + interrupt-parent = <&gpio_intc>;
> + /* MAC_INTR on GPIOZ_14 */
> + interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
It would be great to have the reset GPIO (GPIOZ_15) described as well.
But this can be done in a follow-up patch.

Best regards,
Martin

2023-03-07 07:59:05

by Neil Armstrong

[permalink] [raw]

Subject: Re: [PATCH v2 2/2] arm64: dts: amlogic: Add initial support for BPI-CM4 module with BPI-CM4IO baseboard

On 06/03/2023 23:11, Martin Blumenstingl wrote:
> Hi Neil,
>
> On Mon, Mar 6, 2023 at 9:31 AM Neil Armstrong <[email protected]> wrote:
>>
>> Add support for both the BananaPi BPI-CM4 module and the BananaPi
>> baseboard which is comnpatible with the RaspberryPi CM4IO baseboard.
> s/comnpatible/compatible/
>
>>
>> The BananaPi BPI-CM4 module follows the CM4 specifications at [1],
>> but with a single HDMI port and a since DSI output.
> s/since/single/
>
>>
>> The current CM4IO baseboard DT should work fine on the Raspberry CM4
>> baseboard and other derivatives baseboards, but proper DT should
>> be written for other baseboards.
>>
>> The split is done so it's easy to describe a new CM4 baseboard, enabling
>> only the necessary HW used on the baseboard.
>>
>> [1] https://datasheets.raspberrypi.com/cm4io/cm4io-datasheet.pdf
>>
>> Tested-by: Christian Hewitt <[email protected]>
>> Signed-off-by: Neil Armstrong <[email protected]>
> With the typos above fixed:

I'll fix those while applying

> Reviewed-by: Martin Blumenstingl <[email protected]>
>
> [...]
>> +&ext_mdio {
>> + external_phy: ethernet-phy@0 {
>> + /* Realtek RTL8211F (0x001cc916) */
>> + reg = <0>;
>> + max-speed = <1000>;
>> +
>> + interrupt-parent = <&gpio_intc>;
>> + /* MAC_INTR on GPIOZ_14 */
>> + interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
> It would be great to have the reset GPIO (GPIOZ_15) described as well.
> But this can be done in a follow-up patch.

I'll send a follow-up

>
>
> Best regards,
> Martin

Thanks !
Neil

2023-03-07 08:06:41

by Neil Armstrong

[permalink] [raw]

Subject: Re: [PATCH v2 0/2] arm64: amlogic: Add initial support for BPI-CM4 module with BPI-CM4IO baseboard

Hi,

On Mon, 06 Mar 2023 09:31:37 +0100, Neil Armstrong wrote:
> Add support for both the BananaPi BPI-CM4 module and the BananaPi
> baseboard which is comnpatible with the RaspberryPi CM4IO baseboard.
>
> The BananaPi BPI-CM4 module follows the CM4 specifications at [1],
> but with a single HDMI port and a since DSI output.
>
> The current CM4IO baseboard DT should work fine on the Raspberry CM4
> baseboard and other derivatives baseboards, but proper DT should
> be written for other baseboards.
>
> [...]

Thanks, Applied to https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git (v6.4/arm64-dt)

[1/2] dt-bindings: arm: amlogic: Document the boards with the BPI-CM4 connected
https://git.kernel.org/amlogic/c/92c0b261c294f12e329976a6d4ef72651e8f07f2
[2/2] arm64: dts: amlogic: Add initial support for BPI-CM4 module with BPI-CM4IO baseboard
https://git.kernel.org/amlogic/c/0262f2736978b1763363224698f47112a148dab0

These changes has been applied on the intermediate git tree [1].

The v6.4/arm64-dt branch will then be sent via a formal Pull Request to the Linux SoC maintainers
for inclusion in their intermediate git branches in order to be sent to Linus during
the next merge window, or sooner if it's a set of fixes.

In the cases of fixes, those will be merged in the current release candidate
kernel and as soon they appear on the Linux master branch they will be
backported to the previous Stable and Long-Stable kernels [2].

The intermediate git branches are merged daily in the linux-next tree [3],
people are encouraged testing these pre-release kernels and report issues on the
relevant mailing-lists.

If problems are discovered on those changes, please submit a signed-off-by revert
patch followed by a corrective changeset.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
[3] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

--
Neil