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

[kishon]

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

Thanks
Kishon
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