linux-kernel - Re: [PATCH v2 06/13] arm64: dts: allwinner: a100: add usb related nodes

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Message-ID: <c231d0fbd13e2ff6ea23dc907b46112f@epochal.quest>
Date: Fri, 01 Nov 2024 03:14:32 -0300
From: Cody Eksal <masterr3c0rd@...chal.quest>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>, Jernej
 Skrabec <jernej.skrabec@...il.com>, Samuel Holland <samuel@...lland.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Kishon Vijay Abraham I
 <kishon@...nel.org>, Maxime Ripard <mripard@...nel.org>, Michael Turquette
 <mturquette@...libre.com>, Nishanth Menon <nm@...com>, "Rafael J. Wysocki"
 <rafael@...nel.org>, Stephen Boyd <sboyd@...nel.org>, Vinod Koul
 <vkoul@...nel.org>, Viresh Kumar <vireshk@...nel.org>, Viresh Kumar
 <viresh.kumar@...aro.org>, Yangtao Li <tiny.windzz@...il.com>, Parthiban
 <parthiban@...umiz.com>, Andre Przywara <andre.przywara@....com>,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/13] arm64: dts: allwinner: a100: add usb related
 nodes

On 2024/10/31 4:02 am, Cody Eksal wrote:
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi 
> b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> index adb11b26045f..f6162a107641 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> @@ -302,6 +302,97 @@ ths: thermal-sensor@...0400 {
>  			#thermal-sensor-cells = <1>;
>  		};
> +
> +		usb_otg: usb@...0000 {
> +			compatible = "allwinner,sun50i-a100-musb",
> +				     "allwinner,sun8i-a33-musb";
> +			reg = <0x05100000 0x0400>;
> +			clocks = <&ccu CLK_BUS_OTG>;
> +			resets = <&ccu RST_BUS_OTG>;
> +			interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "mc";
> +			phys = <&usbphy 0>;
> +			phy-names = "usb";
> +			extcon = <&usbphy 0>;
> +			status = "disabled";
> +		};
Quick note: it was determined that if ehci0 and/or ohci0 are enabled,
peripheral mode does not function correctly. From my understanding, it 
is
an unrelated issue in musb that causes this; the PHY gets claimed by the
HCI nodes before MUSB, and due to some other issue, the PHY doesn't get
properly rerouted to MUSB. With those nodes disabled, attaching gadgets 
to
MUSB works correctly, and with them enabled, host mode works properly.

- Cody
> +		usbphy: phy@...0400 {
> +			compatible = "allwinner,sun50i-a100-usb-phy",
> +				     "allwinner,sun20i-d1-usb-phy";
> +			reg = <0x05100400 0x100>,
> +			      <0x05101800 0x100>,
> +			      <0x05200800 0x100>;
> +			reg-names = "phy_ctrl",
> +				    "pmu0",
> +				    "pmu1";
> +			clocks = <&ccu CLK_USB_PHY0>,
> +				 <&ccu CLK_USB_PHY1>;
> +			clock-names = "usb0_phy",
> +				      "usb1_phy";
> +			resets = <&ccu RST_USB_PHY0>,
> +				 <&ccu RST_USB_PHY1>;
> +			reset-names = "usb0_reset",
> +				      "usb1_reset";
> +			status = "disabled";
> +			#phy-cells = <1>;
> +		};
> +
> +		ehci0: usb@...1000 {
> +			compatible = "allwinner,sun50i-a100-ehci",
> +				     "generic-ehci";
> +			reg = <0x05101000 0x100>;
> +			interrupts = <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_OHCI0>,
> +				 <&ccu CLK_BUS_EHCI0>,
> +				 <&ccu CLK_USB_OHCI0>;
> +			resets = <&ccu RST_BUS_OHCI0>,
> +				 <&ccu RST_BUS_EHCI0>;
> +			phys = <&usbphy 0>;
> +			phy-names = "usb";
> +			status = "disabled";
> +		};
> +
> +		ohci0: usb@...1400 {
> +			compatible = "allwinner,sun50i-a100-ohci",
> +				     "generic-ohci";
> +			reg = <0x05101400 0x100>;
> +			interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_OHCI0>,
> +				 <&ccu CLK_USB_OHCI0>;
> +			resets = <&ccu RST_BUS_OHCI0>;
> +			phys = <&usbphy 0>;
> +			phy-names = "usb";
> +			status = "disabled";
> +		};