Re: [PATCH v3 2/2] rockchip: rk3399: Add support for FriendlyARM NanoPi R4S

[Robin Murphy <robin.murphy@arm.com>]

On 2021-03-13 03:25, Tianling Shen wrote:
> This adds support for the NanoPi R4S from FriendlyArm.
> 
> Rockchip RK3399 SoC
> 1GB DDR3 or 4GB LPDDR4 RAM
> Gigabit Ethernet (WAN)
> Gigabit Ethernet (PCIe) (LAN)
> USB 3.0 Port x 2
> MicroSD slot
> Reset button
> WAN - LAN - SYS LED
> 
> [initial DTS file]
> Co-developed-by: Jensen Huang <jensenhuang@friendlyarm.com>
> Signed-off-by: Jensen Huang <jensenhuang@friendlyarm.com>
> [minor adjustments]
> Co-developed-by: Marty Jones <mj8263788@gmail.com>
> Signed-off-by: Marty Jones <mj8263788@gmail.com>
> [fixed format issues]
> Signed-off-by: Tianling Shen <cnsztl@gmail.com>
> 
> Reported-by: kernel test robot <lkp@intel.com>
> ---
>   arch/arm64/boot/dts/rockchip/Makefile         |   1 +
>   .../boot/dts/rockchip/rk3399-nanopi-r4s.dts   | 179 ++++++++++++++++++
>   2 files changed, 180 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> 
> diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
> index 62d3abc17a24..c3e00c0e2db7 100644
> --- a/arch/arm64/boot/dts/rockchip/Makefile
> +++ b/arch/arm64/boot/dts/rockchip/Makefile
> @@ -36,6 +36,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopc-t4.dtb
>   dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopi-m4.dtb
>   dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopi-m4b.dtb
>   dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopi-neo4.dtb
> +dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopi-r4s.dtb
>   dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-orangepi.dtb
>   dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-pinebook-pro.dtb
>   dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-puma-haikou.dtb
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> new file mode 100644
> index 000000000000..41b3d5c5043c
> --- /dev/null
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> @@ -0,0 +1,179 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * FriendlyElec NanoPC-T4 board device tree source
> + *
> + * Copyright (c) 2020 FriendlyElec Computer Tech. Co., Ltd.
> + * (http://www.friendlyarm.com)
> + *
> + * Copyright (c) 2018 Collabora Ltd.
> + *
> + * Copyright (c) 2020 Jensen Huang <jensenhuang@friendlyarm.com>
> + * Copyright (c) 2020 Marty Jones <mj8263788@gmail.com>
> + * Copyright (c) 2021 Tianling Shen <cnsztl@gmail.com>
> + */
> +
> +/dts-v1/;
> +#include "rk3399-nanopi4.dtsi"
> +
> +/ {
> +	model = "FriendlyElec NanoPi R4S";
> +	compatible = "friendlyarm,nanopi-r4s", "rockchip,rk3399";
> +
> +	/delete-node/ gpio-leds;

Why? You could justify deleting &status_led, but redefining the whole 
node from scratch seems unnecessary.

> +	gpio-leds {
> +		compatible = "gpio-leds";
> +		pinctrl-0 = <&lan_led_pin>, <&sys_led_pin>, <&wan_led_pin>;
> +		pinctrl-names = "default";
> +
> +		lan_led: led-0 {
> +			gpios = <&gpio1 RK_PA1 GPIO_ACTIVE_HIGH>;
> +			label = "nanopi-r4s:green:lan";
> +		};
> +
> +		sys_led: led-1 {
> +			gpios = <&gpio0 RK_PB5 GPIO_ACTIVE_HIGH>;
> +			label = "nanopi-r4s:red:sys";
> +			default-state = "on";
> +		};
> +
> +		wan_led: led-2 {
> +			gpios = <&gpio1 RK_PA0 GPIO_ACTIVE_HIGH>;
> +			label = "nanopi-r4s:green:wan";
> +		};
> +	};
> +
> +	/delete-node/ gpio-keys;

Ditto - just removing the power key node itself should suffice.

> +	gpio-keys {
> +		compatible = "gpio-keys";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&reset_button_pin>;
> +
> +		reset {
> +			debounce-interval = <50>;
> +			gpios = <&gpio1 RK_PC6 GPIO_ACTIVE_LOW>;
> +			label = "reset";
> +			linux,code = <KEY_RESTART>;
> +		};
> +	};
> +
> +	vdd_5v: vdd-5v {
> +		compatible = "regulator-fixed";
> +		regulator-name = "vdd_5v";
> +		regulator-always-on;
> +		regulator-boot-on;
> +	};
> +
> +	fan: pwm-fan {
> +		compatible = "pwm-fan";
> +		/*
> +		 * With 20KHz PWM and an EVERCOOL EC4007H12SA fan, these levels
> +		 * work out to 0, ~1200, ~3000, and 5000RPM respectively.
> +		 */
> +		cooling-levels = <0 12 18 255>;

This is clearly not true - those numbers refer to a 12V fan on my 
NanoPC-T4's 12V PWM circuit, while the output circuit here is 5V. If you 
really want a placeholder here maybe just use <0 255>, or figure out 
some empirical values with a suitable 5V fan that are actually meaningful.

> +		#cooling-cells = <2>;
> +		fan-supply = <&vdd_5v>;
> +		pwms = <&pwm1 0 50000 0>;
> +	};
> +};
> +
> +&cpu_thermal {
> +	trips {
> +		cpu_warm: cpu_warm {
> +			temperature = <55000>;
> +			hysteresis = <2000>;
> +			type = "active";
> +		};
> +
> +		cpu_hot: cpu_hot {
> +			temperature = <65000>;
> +			hysteresis = <2000>;
> +			type = "active";
> +		};
> +	};
> +
> +	cooling-maps {
> +		map2 {
> +			trip = <&cpu_warm>;
> +			cooling-device = <&fan THERMAL_NO_LIMIT 1>;
> +		};
> +
> +		map3 {
> +			trip = <&cpu_hot>;
> +			cooling-device = <&fan 2 THERMAL_NO_LIMIT>;
> +		};
> +	};
> +};
> +
> +&emmc_phy {
> +	status = "disabled";
> +};
> +
> +&fusb0 {
> +	status = "disabled";

This can never be enabled since it doesn't exist in the design at all, 
so it's one place where deletion *would* make good sense. AFAICS this 
means you also don't need i2c4 enabled either.

> +};

It might be nice to disable HDMI and all the other display pieces given 
that the board is physically headless.

> +
> +&pcie0 {
> +	max-link-speed = <1>;
> +	num-lanes = <1>;
> +	vpcie3v3-supply = <&vcc3v3_sys>;
> +
> +	pcie@0 {
> +		reg = <0x00000000 0 0 0 0>;
> +		#address-cells = <3>;
> +		#size-cells = <2>;
> +	};

What's this for?

> +};
> +
> +&pinctrl {
> +	/delete-node/ gpio-leds;

Again, at most you'd only need to delete &status_led_pin.

> +	gpio-leds {
> +		lan_led_pin: lan-led-pin {
> +			rockchip,pins = <1 RK_PA1 RK_FUNC_GPIO &pcfg_pull_none>;
> +		};
> +
> +		sys_led_pin: sys-led-pin {
> +			rockchip,pins = <0 RK_PB5 RK_FUNC_GPIO &pcfg_pull_none>;
> +		};
> +
> +		wan_led_pin: wan-led-pin {
> +			rockchip,pins = <1 RK_PA0 RK_FUNC_GPIO &pcfg_pull_none>;
> +		};
> +	};
> +
> +	/delete-node/ rockchip-key;

Ditto for &power_key.

> +	rockchip-key {
> +		reset_button_pin: reset-button-pin {
> +			rockchip,pins = <1 RK_PC6 RK_FUNC_GPIO &pcfg_pull_up>;
> +		};
> +	};
> +};
> +
> +&sdhci {
> +	status = "disabled";
> +};
> +
> +&sdio0 {
> +	status = "disabled";
> +};
> +
> +&sdmmc {
> +	sd-uhs-sdr12;
> +	sd-uhs-sdr25;
> +	sd-uhs-sdr50;

Are those modes unique to this particular board?

> +};
> +

What about the Bluetooth stuff on uart0?

Robin.

> +&u2phy0_host {
> +	phy-supply = <&vdd_5v>;
> +};
> +
> +&u2phy1_host {
> +	status = "disabled";
> +};
> +
> +&usbdrd_dwc3_0 {
> +	dr_mode = "host";
> +};
> +
> +&vcc3v3_sys {
> +	vin-supply = <&vcc5v0_sys>;
> +};
>