linux-kernel - Re: [PATCH v4 1/2] ARM: dts: sun8i-r40: Add USB0

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Message-ID: <daf5c543-a1d1-04d2-6486-6cc9cd72d8e5@sholland.org>
Date:   Mon, 4 Jul 2022 20:55:36 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     qianfanguijin@....com
Cc:     linux-sunxi@...ts.linux.dev,
        Andre Przywara <andre.przywara@....com>,
        Evgeny Boger <boger@...enboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] ARM: dts: sun8i-r40: Add USB0_OTG/HOST support

Hi Qianfan,

On 5/18/22 5:17 AM, qianfanguijin@....com wrote:
> From: qianfan Zhao <qianfanguijin@....com>
> 
> The USB0 port of R40 is divided into two controllers, one is H3
> compatibled MUSB device, another is OHCI/EHCI.

typo: compatible

> 
> Signed-off-by: qianfan Zhao <qianfanguijin@....com>
> ---
>  arch/arm/boot/dts/sun8i-r40.dtsi | 34 ++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi
> index 212e19183484..ae48474fdefa 100644
> --- a/arch/arm/boot/dts/sun8i-r40.dtsi
> +++ b/arch/arm/boot/dts/sun8i-r40.dtsi
> @@ -401,6 +401,21 @@ mmc3: mmc@...2000 {
>  			#size-cells = <0>;
>  		};
>  
> +		usb_otg: usb@...3000 {
> +			compatible = "allwinner,sun8i-r40-musb",

This compatible string needs to be documented in the binding[0] before you can
use it.

[0]: Documentation/devicetree/bindings/usb/allwinner,sun4i-a10-musb.yaml

> +				     "allwinner,sun8i-h3-musb";
> +			reg = <0x01c13000 0x0400>;
> +			clocks = <&ccu CLK_BUS_OTG>;
> +			resets = <&ccu RST_BUS_OTG>;
> +			interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "mc";
> +			phys = <&usbphy 0>;
> +			phy-names = "usb";
> +			extcon = <&usbphy 0>;
> +			dr_mode = "otg";
> +			status = "disabled";
> +		};
> +
>  		usbphy: phy@...3400 {
>  			compatible = "allwinner,sun8i-r40-usb-phy";
>  			reg = <0x01c13400 0x14>,
> @@ -427,6 +442,25 @@ usbphy: phy@...3400 {
>  			#phy-cells = <1>;
>  		};
>  
> +		ehci0: usb@...4000 {
> +			compatible = "allwinner,sun8i-r40-ehci", "generic-ehci";
> +			reg = <0x01c14000 0x100>;
> +			interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_EHCI0>, <&ccu CLK_BUS_OHCI0>;
> +			resets = <&ccu RST_BUS_EHCI0>, <&ccu RST_BUS_OHCI0>;
> +			status = "disabled";
> +		};
> +
> +		ohci0: usb@...4400 {
> +			compatible = "allwinner,sun8i-r40-ohci", "generic-ohci";
> +			reg = <0x01c14400 0x100>;
> +			interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_EHCI0>, <&ccu CLK_BUS_OHCI0>,
> +				 <&ccu CLK_USB_OHCI0>;
> +			resets = <&ccu RST_BUS_EHCI0>, <&ccu RST_BUS_OHCI0>;

Are you sure the OHCI device requires the EHCI clocks/resets? Usually it is only
the other way around.

Regards,
Samuel

> +			status = "disabled";
> +		};
> +
>  		crypto: crypto@...5000 {
>  			compatible = "allwinner,sun8i-r40-crypto";
>  			reg = <0x01c15000 0x1000>;
>