Re: [PATCH] Adding architectural support for HPE's GXP BMC. This is the first of a series of patches to support HPE's BMC with Linux Kernel.

From: Andrew Lunn <andrew@lunn.ch>
To: nick.hawkins@hpe.com
Cc: verdun@hpe.com, Rob Herring <robh+dt@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Shawn Guo <shawnguo@kernel.org>,
	Stanislav Jakubek <stano.jakubek@gmail.com>,
	Sam Ravnborg <sam@ravnborg.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Hao Fang <fanghao11@huawei.com>, Arnd Bergmann <arnd@arndb.de>,
	"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Mark Rutland <mark.rutland@arm.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Lukas Bulwahn <lukas.bulwahn@gmail.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] Adding architectural support for HPE's GXP BMC. This is the first of a series of patches to support HPE's BMC with Linux Kernel.
Date: Tue, 25 Jan 2022 23:30:59 +0100	[thread overview]
Message-ID: <YfB6I5PRPlHPxwLP@lunn.ch> (raw)
In-Reply-To: <20220125194609.32314-1-nick.hawkins@hpe.com>

> +		mdio0: mdio@c0004080 {
> +			compatible = "hpe,gxp-umac-mdio";
> +			reg = <0xc0004080 0x10>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			ext_phy0: ethernt-phy@0 {
> +				compatible = "ethernet-phy-ieee802.3-c22";

c22 is the default, so you don't strictly need this.

> +				phy-mode = "sgmii";
> +				reg = <0>;
> +			};
> +		};
> +
> +		mdio1: mdio@c0005080 {
> +			compatible = "hpe,gxp-umac-mdio";
> +			reg = <0xc0005080 0x10>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			int_phy0: ethernt-phy@0 {
> +				compatible = "ethernet-phy-ieee802.3-c22";
> +				phy-mode = "gmii";
> +				reg = <0>;
> +			};
> +			int_phy1: ethernt-phy@1 {
> +				compatible = "ethernet-phy-ieee802.3-c22";
> +				phy-mode = "gmii";
> +				reg = <1>;
> +			};
> +		};
> +
> +		umac0: umac@c0004000 {
> +			compatible = "hpe, gxp-umac";

A space in a compatible? 

> +			reg = <0xc0004000 0x80>;
> +			interrupts = <10>;
> +			interrupt-parent = <&vic0>;
> +			mac-address = [94 18 82 16 04 d8];

That is pretty unusual. Normally you leave the bootloader to fill this
in with a per board MAC address. The danger with listing it here is
that you have multiple boards in the same network using this MAC
address, and then bad things happen.

> +			phy-handle = <&ext_phy0>;
> +			int-phy-handle = <&int_phy0>;

Two phy-handles? Some very odd going on here!

> +		xreg_kyes: xreg_keys {
> +			compatible = "gpio-keys-polled";
> +			poll-interval = <100>;
> +
> +			IdButton {
> +				label = "ID Button";
> +				linux,code = <200>;

include/dt-bindings/input/linux-event-codes.h 

However

#define KEY_PLAYCD              200

A BMC has a CD player? Maybe i have this wrong?

> +			PortOwner@0 {
> +				label = "Port Owner";
> +				linux,code = <200>;
> +				gpios = <&gpio 250 1>;

Two CD players?

> +			};
> +
> +			PortOwner@1 {
> +				label = "Port Owner";
> +				linux,code = <201>;

#define KEY_PAUSECD             201

And you can pause the second player?

    Andrew

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