RE: [PATCH v3 01/13] USB: s3c-hsotg: Add platform data callbacks for phy control

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Hi Felipe,

On Wednesday, April 11, 2012 4:12 PM Felipe Balbi wrote:

> On Wed, Apr 11, 2012 at 03:37:40PM +0200, Lukasz Majewski wrote:
> > > On Fri, Mar 23, 2012 at 12:48:47PM +0100, Lukasz Majewski wrote:
> > > > From: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
> > > >
> > > > The s3c-hsotg driver controls S3C64XX specific registers directly
> > > > but this driver can be to EXYNOS also. This removes arch specific
> > > > parts from driver using platform data callbacks.
> > > >
> > > > Signed-off-by: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
> > > > Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> > > > ---
> > > >  drivers/usb/gadget/s3c-hsotg.c |   94
> > > > ++++++---------------------------------- 1 files changed, 14
> > > > insertions(+), 80 deletions(-)
> > > >
> > > > diff --git a/drivers/usb/gadget/s3c-hsotg.c
> > > > b/drivers/usb/gadget/s3c-hsotg.c index 105b206..0e8e2f4 100644
> > > > --- a/drivers/usb/gadget/s3c-hsotg.c
> > > > +++ b/drivers/usb/gadget/s3c-hsotg.c
> > > > @@ -35,9 +35,9 @@
> > > >
> > > >  #include <plat/regs-usb-hsotg-phy.h>
> > > >  #include <plat/regs-usb-hsotg.h>
> > > > -#include <mach/regs-sys.h>
> > > >  #include <plat/udc-hs.h>
> > > >  #include <plat/cpu.h>
> > > > +#include <plat/usb-phy.h>
> > >
> > > please put platform_data under <linux/platform_data/>
> >
> > But this code is phy related and used by other Samsung's devices (e.g.
> > exynos4, host controllers, etc.).
> >
> > Following files are using it:
> >
> > ./arch/arm/mach-exynos/setup-usb-phy.c:20:#include <plat/usb-phy.h>
> > ./arch/arm/mach-exynos/dev-ohci.c:21:#include <plat/usb-phy.h>
> > ./arch/arm/mach-s5pv210/setup-usb-phy.c:19:#include <plat/usb-phy.h>
> > ./arch/arm/mach-s5pv210/setup-usb-phy.c~:20:#include <plat/usb-phy.h>
> > ./arch/arm/mach-s3c64xx/setup-usb-phy.c:21:#include <plat/usb-phy.h>
> > ./arch/arm/plat-samsung/devs.c:62:#include <plat/usb-phy.h>
> > ./drivers/usb/gadget/s3c-hsotg.c.orig:41:#include <plat/usb-phy.h>
> > ./drivers/usb/gadget/s3c-hsotg.c:42:#include <plat/usb-phy.h>
> > ./drivers/usb/host/ehci-s5p.c:18:#include <plat/usb-phy.h>
> > ./drivers/usb/host/ohci-exynos.c:17:#include <plat/usb-phy.h>
> 
> The idea is just so drivers don't depend on ARCH-specific includes. I
> really want to make sure all of those drivers compile on all archs so
> we can better use linux-next.

plat/usb-phy.h is available on all Samsung sub-platforms which have USB block.
The current version of the driver has some magic SoC registests hardcoded.
Lukasz's patch fixed this by using a common helper for managing PHY block.
This is a first step to get the driver more platform independent. Once we
get the s3c-hsotg driver working correctly on all Samsung platforms 
(S3C64xx, S5PV210, Exynos4) without any hacks, Lukasz will separate Samsung
custom stuff from the DWC2 core to let others to integrate their support.

Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center



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