linux-kernel - Re: [RFC PATCH 2/6] ARM: OMAP: USB: Add phy binding information

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Date:	Thu, 17 Jan 2013 18:41:04 +0530
From:	Vivek Gautam <gautamvivek1987@...il.com>
To:	kishon <kishon@...com>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-sh@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	balbi@...com, grant.likely@...retlab.ca, rob.herring@...xeda.com,
	rob@...dley.net, b-cousson@...com, tony@...mide.com,
	linux@....linux.org.uk, horms@...ge.net.au, magnus.damm@...il.com,
	cbou@...l.ru, dwmw2@...radead.org,
	alexander.shishkin@...ux.intel.com, gregkh@...uxfoundation.org,
	leoli@...escale.com, eric.y.miao@...il.com,
	haojian.zhuang@...il.com, stern@...land.harvard.edu
Subject: Re: [RFC PATCH 2/6] ARM: OMAP: USB: Add phy binding information

Hi Kishon,


Thanks for the explanation.

On Thu, Jan 17, 2013 at 6:01 PM, kishon <kishon@...com> wrote:
> Hi,
>
>
> On Thursday 17 January 2013 05:41 PM, Vivek Gautam wrote:
>>
>> Hi Kishon,
>>
>>
>> On Wed, Jan 16, 2013 at 8:30 PM, Kishon Vijay Abraham I <kishon@...com>
>> wrote:
>>>
>>> This is in preparation for the changes in PHY library to support adding
>>> and getting multiple PHYs of the same type. In the new design, the
>>> binding information between the PHY and the USB controller should be
>>> specified in the platform specific initialization code. So it's been
>>> done for OMAP platforms here.
>>>
>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>> ---
>>> This kind-of binding should be done in all the platforms (I've done only
>>> for OMAP platform).
>>>   arch/arm/mach-omap2/usb-musb.c |    7 ++++++-
>>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/mach-omap2/usb-musb.c
>>> b/arch/arm/mach-omap2/usb-musb.c
>>> index 9d27e3f..bbe2fa5 100644
>>> --- a/arch/arm/mach-omap2/usb-musb.c
>>> +++ b/arch/arm/mach-omap2/usb-musb.c
>>> @@ -24,6 +24,7 @@
>>>   #include <linux/dma-mapping.h>
>>>   #include <linux/io.h>
>>>   #include <linux/usb/musb.h>
>>> +#include <linux/usb/phy.h>
>>>
>>>   #include "omap_device.h"
>>>   #include "soc.h"
>>> @@ -85,8 +86,12 @@ void __init usb_musb_init(struct omap_musb_board_data
>>> *musb_board_data)
>>>          musb_plat.mode = board_data->mode;
>>>          musb_plat.extvbus = board_data->extvbus;
>>>
>>> -       if (cpu_is_omap44xx())
>>> +       if (cpu_is_omap44xx()) {
>>>                  musb_plat.has_mailbox = true;
>>> +               usb_bind_phy("musb-hdrc.0.auto", 0, "omap-usb2.1.auto");
>>> +       } else if (cpu_is_omap34xx()) {
>>> +               usb_bind_phy("musb-hdrc.0.auto", 0, "twl4030_usb");
>>> +       }
>>
>>
>> Just trying to understand things here.
>> Is the device name we are using here the platform device name (pdev->name)
>> ?
>
>
> it's pdev->dev.name.
>
>> If i am not wrong then for devices added through device tree
>> the device name would actually include the device address in the string,
>
>
> Ideally for device tree, devm_usb_get_phy_by_phandle() introduced in the 5th
> patch of this series should be used.

Ok.
> usb_bind_phy should be called from platform specific initialization files
> (like your board file), which won't get executed in dt boot.
>
Right.

>> wouldn't that make things somewhat weird, since we will have to add
>> such bindings
>> using this address string.
>>
>> one more doubt please :)
>> is it possible to bind phy in the controllers' driver somehow ?
>
> Thats not going to be good. Why do you need to do that?
>
I was certainly missing something while understanding your patches.
That's why got some doubt on this. :)


> Thanks
> Kishon



-- 
Thanks & Regards
Vivek
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