linux-kernel - Re: [PATCH] usb: ehci-platform: increase EHCI_MAX

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Date:   Mon, 17 Oct 2016 21:59:48 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tony Prisk <linux@...sktech.co.nz>,
        Alan Stern <stern@...land.harvard.edu>,
        Icenowy Zheng <icenowy@...c.xyz>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] usb: ehci-platform: increase EHCI_MAX_RSTS to 4

Hi Greg,


2016-10-17 21:30 GMT+09:00 Greg Kroah-Hartman <gregkh@...uxfoundation.org>:
> On Mon, Oct 17, 2016 at 08:11:59PM +0900, Masahiro Yamada wrote:
>> Socionext LD11 SoC (arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi)
>> needs to handle 4 reset lines for EHCI.
>
> Why?  What makes it different from other EHCI implementations?
>
> thanks,
>
> greg k-h


This is a generic EHCI driver, but the number of clocks/resets
are SoC-specific.



The following patch you picked up will remind you something?



commit 73577d61799e8d8bb7d69a9acdc54923e5998138
Author: Icenowy Zheng <icenowy@...c.xyz>
Date:   Fri Aug 12 11:06:22 2016 +0800

    ehci-platform: add the max clock number to 4

    Allwinner A64 EHCI requires 4 clocks to be enabled.

    Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
    Acked-by: Alan Stern <stern@...land.harvard.edu>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>






-- 
Best Regards
Masahiro Yamada