linux-kernel - Re: [PATCH] ARM: dts: aspeed: Add device tree for Ampere's Mt. Mitchell BMC

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Message-ID: <97934f38-4da5-ab9e-7089-d6e48edd5e6a@linaro.org>
Date:   Fri, 24 Jun 2022 17:51:05 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Quan Nguyen <quan@...amperecomputing.com>,
        openbmc@...ts.ozlabs.org, Arnd Bergmann <arnd@...db.de>,
        Olof Johansson <olof@...om.net>, soc@...nel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        Open Source Submission <patches@...erecomputing.com>
Cc:     Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH] ARM: dts: aspeed: Add device tree for Ampere's Mt.
 Mitchell BMC

On 21/06/2022 11:21, Quan Nguyen wrote:
> The Mt. Mitchell BMC is an ASPEED AST2600-based BMC for the Mt. Mitchell
> hardware reference platform with AmpereOne(TM) processor.
> 
> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
> Signed-off-by: Phong Vo <phong@...amperecomputing.com>
> Signed-off-by: Thang Q. Nguyen <thang@...amperecomputing.com>
> ---
>  arch/arm/boot/dts/Makefile                    |   1 +
>  .../boot/dts/aspeed-bmc-ampere-mtmitchell.dts | 579 ++++++++++++++++++
>  2 files changed, 580 insertions(+)
>  create mode 100644 arch/arm/boot/dts/aspeed-bmc-ampere-mtmitchell.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 5112f493f494..93c236c14fa0 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -1558,6 +1558,7 @@ dtb-$(CONFIG_ARCH_ASPEED) += \
>  	aspeed-ast2600-evb.dtb \
>  	aspeed-bmc-amd-ethanolx.dtb \
>  	aspeed-bmc-ampere-mtjade.dtb \
> +	aspeed-bmc-ampere-mtmitchell.dtb \
>  	aspeed-bmc-arm-centriq2400-rep.dtb \
>  	aspeed-bmc-arm-stardragon4800-rep2.dtb \
>  	aspeed-bmc-asrock-e3c246d4i.dtb \
> diff --git a/arch/arm/boot/dts/aspeed-bmc-ampere-mtmitchell.dts b/arch/arm/boot/dts/aspeed-bmc-ampere-mtmitchell.dts
> new file mode 100644
> index 000000000000..42425e13030a
> --- /dev/null
> +++ b/arch/arm/boot/dts/aspeed-bmc-ampere-mtmitchell.dts
> @@ -0,0 +1,579 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +// Copyright 2022 Ampere Computing LTC.
> +
> +/dts-v1/;
> +
> +#include "aspeed-g6.dtsi"
> +#include <dt-bindings/gpio/aspeed-gpio.h>
> +
> +/ {
> +	model = "Ampere Mt.Mitchell BMC";
> +	compatible = "ampere,mtmitchell-bmc", "aspeed,ast2600";

The compatible has to be documented. Please rebase on top of:
https://lore.kernel.org/all/20220529104928.79636-3-krzysztof.kozlowski@linaro.org/

> +
> +	chosen {
> +		stdout-path = &uart5;
> +		bootargs = "console=ttyS4,115200n8 earlycon";

console is not needed, earlycon is debugging tool so definitely should
not go to mainline widely distributed DTS. Remove entire bootargs.

> +	};
> +
> +	memory@...00000 {
> +		device_type = "memory";
> +		reg = <0x80000000 0x80000000>;
> +	};
> +
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		gfx_memory: framebuffer {
> +			size = <0x01000000>;
> +			alignment = <0x01000000>;
> +			compatible = "shared-dma-pool";
> +			reusable;
> +		};
> +
> +		video_engine_memory: video {
> +			size = <0x04000000>;
> +			alignment = <0x01000000>;
> +			compatible = "shared-dma-pool";
> +			reusable;
> +		};
> +
> +		/* 1GB memory */
> +		vga_memory: region@...00000 {
> +			no-map;
> +			compatible = "shared-dma-pool";
> +			reg = <0xbf000000 0x01000000>;  /* 16M */
> +		};
> +

No need for blank line.

> +	};
> +
> +	gpio-keys {
> +		compatible = "gpio-keys";
> +
> +		S0_overtemp {

Only lower-case letters, no underscore but hyphen. Missing prefix (e.g.
key/event/switch/button)

See:
https://lore.kernel.org/all/20220616005224.18391-1-krzysztof.kozlowski@linaro.org/


> +			label = "S0_OVERTEMP";
> +			gpios = <&gpio0 ASPEED_GPIO(V, 7) GPIO_ACTIVE_LOW>;
> +			linux,code = <ASPEED_GPIO(V, 7)>;
> +		};
> +
> +		S0_hightemp {
> +			label = "S0_HIGHTEMP";
> +			gpios = <&gpio0 ASPEED_GPIO(V, 0) GPIO_ACTIVE_LOW>;
> +			linux,code = <ASPEED_GPIO(V, 0)>;
> +		};
> +
> +		S1_overtemp {
> +			label = "S1_OVERTEMP";
> +			gpios = <&gpio0 ASPEED_GPIO(X, 6) GPIO_ACTIVE_LOW>;
> +			linux,code = <ASPEED_GPIO(X, 6)>;
> +		};
> +
> +		S1_hightemp {
> +			label = "S1_HIGHTEMP";
> +			gpios = <&gpio0 ASPEED_GPIO(X, 3) GPIO_ACTIVE_LOW>;
> +			linux,code = <ASPEED_GPIO(X, 3)>;
> +		};
> +	};
> +
> +	ltc2497_reg: ltc2497_regulator {

No underscores in node name, no specific names (Devicetree spec requires
generic), so ltc2497 has to go. You could add some more specific
prefix/suffix to describe the function.

> +		compatible = "regulator-fixed";
> +		regulator-name = "ltc2497_reg";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		regulator-always-on;
> +	};
> +
> +	gpioI5mux: mux-controller {
> +		compatible = "gpio-mux";
> +		#mux-control-cells = <0>;
> +		mux-gpios = <&gpio0 ASPEED_GPIO(I, 5) GPIO_ACTIVE_HIGH>;
> +	};
> +
> +	adc0mux: adc0mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc0 0>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc1mux: adc1mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc0 1>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc2mux: adc2mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc0 2>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc3mux: adc3mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc0 3>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc4mux: adc4mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc0 4>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc5mux: adc5mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc0 5>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc6mux: adc6mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc0 6>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc7mux: adc7mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc0 7>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc8mux: adc8mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc1 0>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc9mux: adc9mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc1 1>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc10mux: adc10mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc1 2>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc11mux: adc11mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc1 3>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc12mux: adc12mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc1 4>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc13mux: adc13mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc1 5>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc14mux: adc14mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc1 6>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	adc15mux: adc15mux {
> +		compatible = "io-channel-mux";
> +		io-channels = <&adc1 7>;
> +		#io-channel-cells = <1>;
> +		io-channel-names = "parent";
> +		mux-controls = <&gpioI5mux>;
> +		channels = "s0", "s1";
> +	};
> +
> +	iio-hwmon {
> +		compatible = "iio-hwmon";
> +		io-channels = <&adc0mux 0>, <&adc0mux 1>,
> +			<&adc1mux 0>, <&adc1mux 1>,
> +			<&adc2mux 0>, <&adc2mux 1>,
> +			<&adc3mux 0>, <&adc3mux 1>,
> +			<&adc4mux 0>, <&adc4mux 1>,
> +			<&adc5mux 0>, <&adc5mux 1>,
> +			<&adc6mux 0>, <&adc6mux 1>,
> +			<&adc7mux 0>, <&adc7mux 1>,
> +			<&adc8mux 0>, <&adc8mux 1>,
> +			<&adc9mux 0>, <&adc9mux 1>,
> +			<&adc10mux 0>, <&adc10mux 1>,
> +			<&adc11mux 0>, <&adc11mux 1>,
> +			<&adc12mux 0>, <&adc12mux 1>,
> +			<&adc13mux 0>, <&adc13mux 1>,
> +			<&adc14mux 0>, <&adc14mux 1>,
> +			<&adc15mux 0>, <&adc15mux 1>,
> +			<&ltc2497 0>, <&ltc2497 1>,
> +			<&ltc2497 2>, <&ltc2497 3>,
> +			<&ltc2497 4>, <&ltc2497 5>,
> +			<&ltc2497 6>, <&ltc2497 7>,
> +			<&ltc2497 8>, <&ltc2497 9>,
> +			<&ltc2497 10>, <&ltc2497 11>,
> +			<&ltc2497 12>, <&ltc2497 13>,
> +			<&ltc2497 14>, <&ltc2497 15>;
> +	};
> +};
> +
> +&mdio0 {
> +	status = "okay";
> +
> +	ethphy0: ethernet-phy@0 {
> +		compatible = "ethernet-phy-ieee802.3-c22";
> +		reg = <0>;
> +	};
> +};
> +
> +&mac0 {
> +	status = "okay";
> +
> +	phy-mode = "rgmii";
> +	phy-handle = <&ethphy0>;
> +
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_rgmii1_default>;
> +};
> +
> +&fmc {
> +	status = "okay";
> +	flash@0 {
> +		status = "okay";> +		m25p,fast-read;
> +		label = "bmc";
> +		spi-max-frequency = <50000000>;
> +#include "openbmc-flash-layout-64.dtsi"
> +	};
> +
> +	flash@1 {
> +		status = "okay";
> +		m25p,fast-read;
> +		label = "alt-bmc";
> +		spi-max-frequency = <50000000>;
> +#include "openbmc-flash-layout-64-alt.dtsi"
> +	};
> +};
> +
> +&spi1 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_spi1_default>;
> +
> +	flash@0 {
> +		status = "okay";
> +		m25p,fast-read;
> +		label = "pnor";
> +		spi-max-frequency = <20000000>;
> +	};
> +};
> +
> +&uart1 {
> +	status = "okay";
> +};
> +
> +&uart2 {
> +	status = "okay";
> +};
> +
> +&uart3 {
> +	status = "okay";
> +};
> +
> +&uart4 {
> +	status = "okay";
> +};
> +
> +&i2c0 {
> +	status = "okay";
> +
> +	temp@2e {

Generic node name, so usually it is "temperature-sensor"

> +		compatible = "adi,adt7490";
> +		reg = <0x2e>;
> +	};
> +};
> +
> +&i2c1 {
> +	status = "okay";
> +};
> +
> +&i2c2 {
> +	status = "okay";
> +
> +	psu@58 {
> +		compatible = "pmbus";
> +		reg = <0x58>;
> +	};
> +
> +	psu@59 {
> +		compatible = "pmbus";
> +		reg = <0x59>;
> +	};
> +};
> +
> +&i2c3 {
> +	status = "okay";
> +};
> +
> +&i2c4 {
> +	status = "okay";
> +
> +	ltc2497: ltc2497@16 {

Generic node name.

> +		compatible = "lltc,ltc2497";
> +		reg = <0x16>;
> +		vref-supply = <&ltc2497_reg>;
> +		#io-channel-cells = <1>;
> +		status = "okay";
> +	 };
> +
> +	eeprom@50 {
> +		compatible = "atmel,24c64";
> +		reg = <0x50>;
> +		pagesize = <32>;
> +	};
> +
> +	i2c-mux@70 {
> +		compatible = "nxp,pca9545";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		reg = <0x70>;
> +		i2c-mux-idle-disconnect;
> +
> +		i2c4_bus70_chn0: i2c@0 {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			reg = <0x0>;
> +
> +			outlet_temp1: tmp75@48 {

Generic node name.

> +				compatible = "ti,tmp75";
> +				reg = <0x48>;
> +			};
> +			psu1_inlet_temp2: tmp75@49 {

Generic node name.

> +				compatible = "ti,tmp75";
> +				reg = <0x49>;
> +			};
> +		};
> +
> +		i2c4_bus70_chn1: i2c@1 {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			reg = <0x1>;
> +
> +			pcie_zone_temp1: tmp75@48 {

Generic node name.

> +				compatible = "ti,tmp75";
> +				reg = <0x48>;
> +			};
> +			psu0_inlet_temp2: tmp75@49 {

Generic node name.

> +				compatible = "ti,tmp75";
> +				reg = <0x49>;
> +			};
> +		};
> +
> +		i2c4_bus70_chn2: i2c@2 {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			reg = <0x2>;
> +
> +			pcie_zone_temp2: tmp75@48 {

Generic node name.

> +				compatible = "ti,tmp75";
> +				reg = <0x48>;
> +			};
> +			outlet_temp2: tmp75@49 {

Generic node name.

> +				compatible = "ti,tmp75";
> +				reg = <0x49>;
> +			};
> +		};
> +
> +		i2c4_bus70_chn3: i2c@3 {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			reg = <0x3>;
> +
> +			mb_inlet_temp1: tmp75@7c {

Generic node name.

> +				compatible = "microchip,emc1413";
> +				reg = <0x7c>;
> +			};
> +			mb_inlet_temp2: tmp75@4c {

Generic node name.

> +				compatible = "microchip,emc1413";
> +				reg = <0x4c>;
> +			};
> +		};
> +	};
> +};
> +
> +&i2c5 {
> +	status = "okay";
> +
> +	i2c-mux@70 {
> +		compatible = "nxp,pca9548";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		reg = <0x70>;
> +		i2c-mux-idle-disconnect;
> +	};
> +};
> +
> +&i2c6 {
> +	status = "okay";
> +	rtc@51 {
> +		compatible = "nxp,pcf85063a";
> +		reg = <0x51>;
> +	};
> +};
> +
> +&i2c7 {
> +	status = "okay";
> +};
> +
> +&i2c9 {
> +	status = "okay";
> +};
> +
> +&i2c11 {
> +	status = "okay";
> +};
> +
> +&i2c14 {
> +	status = "okay";
> +	eeprom@50 {
> +		compatible = "atmel,24c64";
> +		reg = <0x50>;
> +		pagesize = <32>;
> +	};
> +
> +	bmc_ast2600_cpu: tmp175@35 {

Generic node name.

Best regards,
Krzysztof