linux-kernel - Re: [PATCH 2/6] ARM: sun8i: r40: add USB host port nodes for R40

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Date:   Tue, 10 Oct 2017 07:24:28 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:     Chen-Yu Tsai <wens@...e.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Icenowy Zheng <icenowy@...c.xyz>
Subject: Re: [PATCH 2/6] ARM: sun8i: r40: add USB host port nodes for R40



于 2017年10月10日 GMT+08:00 上午5:03:40, Maxime Ripard <maxime.ripard@...e-electrons.com> 写到:
>On Sun, Oct 08, 2017 at 04:29:02AM +0000, Icenowy Zheng wrote:
>> From: Icenowy Zheng <icenowy@...c.xyz>
>> 
>> Allwinner R40 SoC features a USB OTG port and two USB HOST ports.
>> 
>> Add support for the host ports in the DTSI file.
>> 
>> The OTG controller still cannot work with existing compatibles, and
>needs
>> more investigation. So it's not added yet.
>> 
>> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
>> ---
>>  arch/arm/boot/dts/sun8i-r40.dtsi | 78
>++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 78 insertions(+)
>> 
>> diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi
>b/arch/arm/boot/dts/sun8i-r40.dtsi
>> index d5a6745409ae..f6c917cbbaac 100644
>> --- a/arch/arm/boot/dts/sun8i-r40.dtsi
>> +++ b/arch/arm/boot/dts/sun8i-r40.dtsi
>> @@ -173,6 +173,84 @@
>>  			#size-cells = <0>;
>>  		};
>>  
>> +		usbphy: phy@...3400 {
>> +			compatible = "allwinner,sun8i-r40-usb-phy";
>> +			reg = <0x01c13400 0x14>,
>> +			      <0x01c14800 0x4>,
>> +			      <0x01c19800 0x4>,
>> +			      <0x01c1c800 0x4>;
>> +			reg-names = "phy_ctrl",
>> +				    "pmu0",
>> +				    "pmu1",
>> +				    "pmu2";
>> +			clocks = <&ccu CLK_USB_PHY0>,
>> +				 <&ccu CLK_USB_PHY1>,
>> +				 <&ccu CLK_USB_PHY2>;
>> +			clock-names = "usb0_phy",
>> +				      "usb1_phy",
>> +				      "usb2_phy";
>> +			resets = <&ccu RST_USB_PHY0>,
>> +				 <&ccu RST_USB_PHY1>,
>> +				 <&ccu RST_USB_PHY2>;
>> +			reset-names = "usb0_reset",
>> +				      "usb1_reset",
>> +				      "usb2_reset";
>> +			status = "disabled";
>> +			#phy-cells = <1>;
>> +		};
>> +
>> +		ehci1: usb@...9000 {
>> +			compatible = "allwinner,sun8i-r40-ehci", "generic-ehci";
>> +			reg = <0x01c19000 0x100>;
>
>What is the actual size here?

The OHCI/EHCI/PHY-PHY three parts are listed in the user manual
as one MMIO zone.

The size can be at most 0x400, as the OHCI is at offset 0x400.

>
>> +			interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>;
>> +			clocks = <&ccu CLK_BUS_OHCI1>,
>> +				 <&ccu CLK_BUS_EHCI1>,
>> +				 <&ccu CLK_USB_OHCI1>;
>> +			resets = <&ccu RST_BUS_OHCI1>,
>> +				 <&ccu RST_BUS_EHCI1>;
>
>Why do you need to take the OHCI resources too?

AW's strange design -- without OHCI resources taken EHCI
won't work.

>
>Maxime