Re: [PATCH v3 5/5] dts: usb: add StarFive JH7110 USB dts configuration.

From: Rob Herring <robh@kernel.org>
To: Minda Chen <minda.chen@starfivetech.com>
Cc: Emil Renner Berthing <emil.renner.berthing@canonical.com>,
	Conor Dooley <conor@kernel.org>, Vinod Koul <vkoul@kernel.org>,
	Kishon Vijay Abraham I <kishon@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Pawel Laszczak <pawell@cadence.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Peter Chen <peter.chen@kernel.org>,
	Roger Quadros <rogerq@kernel.org>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-phy@lists.infradead.org, linux-usb@vger.kernel.org,
	linux-riscv@lists.infradead.org,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Subject: Re: [PATCH v3 5/5] dts: usb: add StarFive JH7110 USB dts configuration.
Date: Mon, 20 Mar 2023 10:34:19 -0500	[thread overview]
Message-ID: <20230320153419.GB1713196-robh@kernel.org> (raw)
In-Reply-To: <20230315104411.73614-6-minda.chen@starfivetech.com>

On Wed, Mar 15, 2023 at 06:44:11PM +0800, Minda Chen wrote:
> USB Glue layer and Cadence USB subnode configuration,
> also includes USB and PCIe phy dts configuration.
> 
> Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
> ---
>  .../jh7110-starfive-visionfive-2.dtsi         |  7 +++
>  arch/riscv/boot/dts/starfive/jh7110.dtsi      | 54 +++++++++++++++++++
>  2 files changed, 61 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi
> index a132debb9b53..c64476aebc1a 100644
> --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi
> +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi
> @@ -236,3 +236,10 @@
>  	pinctrl-0 = <&uart0_pins>;
>  	status = "okay";
>  };
> +
> +&usb0 {
> +	status = "okay";
> +	usbdrd_cdns3: usb@0 {
> +		dr_mode = "peripheral";
> +	};
> +};
> diff --git a/arch/riscv/boot/dts/starfive/jh7110.dtsi b/arch/riscv/boot/dts/starfive/jh7110.dtsi
> index f70a4ed47eb4..17722fd1be62 100644
> --- a/arch/riscv/boot/dts/starfive/jh7110.dtsi
> +++ b/arch/riscv/boot/dts/starfive/jh7110.dtsi
> @@ -362,6 +362,60 @@
>  			status = "disabled";
>  		};
>  
> +		usb0: usb@10100000 {
> +			compatible = "starfive,jh7110-usb";
> +			clocks = <&stgcrg JH7110_STGCLK_USB0_LPM>,
> +				 <&stgcrg JH7110_STGCLK_USB0_STB>,
> +				 <&stgcrg JH7110_STGCLK_USB0_APB>,
> +				 <&stgcrg JH7110_STGCLK_USB0_AXI>,
> +				 <&stgcrg JH7110_STGCLK_USB0_UTMI_APB>;
> +			clock-names = "lpm", "stb", "apb", "axi", "utmi_apb";
> +			resets = <&stgcrg JH7110_STGRST_USB0_PWRUP>,
> +				 <&stgcrg JH7110_STGRST_USB0_APB>,
> +				 <&stgcrg JH7110_STGRST_USB0_AXI>,
> +				 <&stgcrg JH7110_STGRST_USB0_UTMI_APB>;
> +			starfive,stg-syscon = <&stg_syscon 0x4 0xc4 0x148 0x1f4>;
> +			starfive,sys-syscon = <&sys_syscon 0x18>;
> +			status = "disabled";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges = <0x0 0x0 0x10100000 0x100000>;
> +
> +			usbdrd_cdns3: usb@0 {
> +				compatible = "cdns,usb3";

This pattern of USB wrapper and then a "generic" IP node is discouraged 
if it is just clocks, resets, power-domains, etc. IOW, unless there's an 
actual wrapper h/w block with its own registers, then don't do this 
split. Merge it all into a single node.

> +				reg = <0x0 0x10000>,
> +				      <0x10000 0x10000>,
> +				      <0x20000 0x10000>;
> +				reg-names = "otg", "xhci", "dev";
> +				interrupts = <100>, <108>, <110>;
> +				interrupt-names = "host", "peripheral", "otg";
> +				phys = <&usbphy0>;
> +				phy-names = "cdns3,usb2-phy";

No need for *-names when there is only 1 entry. Names are local to the 
device and only to distinguish entries, so 'usb2' would be sufficient 
here.

> +				maximum-speed = "super-speed";
> +			};
> +		};
> +
> +		usbphy0: phy@10200000 {
> +			compatible = "starfive,jh7110-usb-phy";
> +			reg = <0x0 0x10200000 0x0 0x10000>;
> +			clocks = <&syscrg JH7110_SYSCLK_USB_125M>,
> +				 <&stgcrg JH7110_STGCLK_USB0_APP_125>;
> +			clock-names = "125m", "app_125";
> +			#phy-cells = <0>;
> +		};
> +
> +		pciephy0: phy@10210000 {
> +			compatible = "starfive,jh7110-pcie-phy";
> +			reg = <0x0 0x10210000 0x0 0x10000>;
> +			#phy-cells = <0>;
> +		};
> +
> +		pciephy1: phy@10220000 {
> +			compatible = "starfive,jh7110-pcie-phy";
> +			reg = <0x0 0x10220000 0x0 0x10000>;
> +			#phy-cells = <0>;
> +		};
> +
>  		stgcrg: clock-controller@10230000 {
>  			compatible = "starfive,jh7110-stgcrg";
>  			reg = <0x0 0x10230000 0x0 0x10000>;
> -- 
> 2.17.1
> 

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