linux-kernel - Re: [PATCH 3/3] ehci-platform: add the max clock number to 4

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Date:	Mon, 1 Aug 2016 09:27:12 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	Icenowy Zheng <icenowy@...c.xyz>, Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Reinder de Haan <patchesrdh@...as.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Tony Prisk <linux@...sktech.co.nz>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH 3/3] ehci-platform: add the max clock number to 4

Hi,

On 01-08-16 09:05, Icenowy Zheng wrote:
> 			clocks = <&ccu CLK_A64_BUS_OHCI1>,
> 				 <&ccu CLK_A64_BUS_EHCI1>,
> 				 <&ccu CLK_A64_USB_OHCI0>,
> 				 <&ccu CLK_A64_USB_OHCI1>;
>
> On A64, EHCI requires the matched OHCI to work.

Ah, so just like on the H3 (where this also is needed
and not documented).

> And OHCI1 clock requires OHCI0 clock to work.

Hmm, that one is new, can you double check this ?

Regards,

Hans


>
> (But from the SoC's user manual we cannot get any infomation
> about the relationship between OHCI1 clock and OHCI0 clock,
> and in the manual OHCI0 clock is called OTG-OHCI)
>
> 01.08.2016, 15:01, "Arnd Bergmann" <arnd@...db.de>:
>> On Sunday, July 31, 2016 7:25:36 PM CEST Icenowy Zheng wrote:
>>>  Allwinner A64 EHCI requires 4 clocks to be enabled.
>>>
>>>  Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
>>
>> Can you say what those four clocks are?
>>
>> Are you sure that it's not just a case of a clock being
>> incorrectly described in the clk driver, i.e. you reference
>> one clock along with its parent here?
>>
>>         Arnd