linux-kernel - Re: [PATCH 2/4] usb: host: xhci-plat: Add support to get PHYs

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Date:	Wed, 25 Jun 2014 02:34:03 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Julius Werner <jwerner@...omium.org>,
	Vivek Gautam <gautam.vivek@...sung.com>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	kishon <kishon@...com>, Mathias Nyman <mathias.nyman@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Kukjin Kim <kgene.kim@...sung.com>
Subject: Re: [PATCH 2/4] usb: host: xhci-plat: Add support to get PHYs

Hello.

On 06/10/2014 12:22 AM, Julius Werner wrote:

>> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
>> index 9ffecd5..453d89e 100644
>> --- a/drivers/usb/host/xhci.h
>> +++ b/drivers/usb/host/xhci.h
>> @@ -1582,6 +1582,9 @@ struct xhci_hcd {
>>          u32                     port_status_u0;
>>   /* Compliance Mode Timer Triggered every 2 seconds */
>>   #define COMP_MODE_RCVRY_MSECS 2000
>> +       /* phys for the controller */
>> +       struct phy              *phy2_gen;
>> +       struct phy              *phy3_gen;
>>   };

> I don't think adding new variables here and restricting most of this
> logic to xhci-plat.c (in the next patch) is the best way to do it.

    Indeed.

> There's no conceptual reason why other host controllers (e.g. xhci-pci
> or even EHCI) could not have a similar need to tune their PHY after
> reset. PHYs are universal to all host controllers.

> There is already a 'phy' member in struct usb_hcd which I think is
> mostly unused right now. I think it would be much less
> confusing/redundant to reuse that member for this purpose (you could
> still set it up from xhci_plat_probe(), and then call it from
> hcd_bus_resume() or something like that).

    That member has type 'struct usb_phy *' while here we have 'struct phy *' 
-- feel the difference.
    I have already tried adding 'struct phy *gen_phy' to 'struct usb_hcd', 
however Greg wasn't eager to pick that up so far. Here's the last posting of 
my patch:

http://marc.info/?l=linux-usb&m=140145917506582

WBR, Sergei

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