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

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Message-ID: <7ee77556174b84846a59d57525ec1cb9@aosc.io>
Date:   Mon, 16 Oct 2017 17:39:58 +0800
From:   icenowy@...c.io
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        Icenowy Zheng <icenowy@...c.xyz>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/6] ARM: sun8i: r40: add USB host port nodes for R40

在 2017-10-16 17:32，Maxime Ripard 写道：
> On Tue, Oct 10, 2017 at 07:24:28AM +0800, Icenowy Zheng wrote:
>> >> +			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.
> 
> How has this been tested?

As EHCI is probed before OHCI, this behavior is easy to
appear if the OHCI resources are removed.

> 
> Thanks!
> Maxime
> 
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> linux-arm-kernel@...ts.infradead.org
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