linux-kernel - Re: [PATCH 3/5 v12] arm: omap: usb: register hwmods of usbhs

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Message-ID: <20110930073449.GA13825@legolas.emea.dhcp.ti.com>
Date:	Fri, 30 Sep 2011 10:34:50 +0300
From:	Felipe Balbi <balbi@...com>
To:	Paul Walmsley <paul@...an.com>
Cc:	Keshava Munegowda <keshava_mgowda@...com>,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, balbi@...com, khilman@...com,
	b-cousson@...com, gadiyar@...com, sameo@...ux.intel.com,
	parthab@...ia.ti.com, tony@...mide.com, johnstul@...ibm.com,
	vishwanath.bs@...com
Subject: Re: [PATCH 3/5 v12] arm: omap: usb: register hwmods of usbhs

Hi,

On Fri, Sep 30, 2011 at 01:15:55AM -0600, Paul Walmsley wrote:
> > The hwmod structure of usb_host_hs  and usb_tll are
> > retrieved and registered with omap device
> > 
> > Signed-off-by: Keshava Munegowda <keshava_mgowda@...com>
> > Reviewed-by: Partha Basak <parthab@...ia.ti.com>
> > ---
> >  arch/arm/mach-omap2/usb-host.c |  100 ++++++++++++++--------------------------
> >  1 files changed, 34 insertions(+), 66 deletions(-)
> > 
> > diff --git a/arch/arm/mach-omap2/usb-host.c b/arch/arm/mach-omap2/usb-host.c
> > index 89ae298..771dc78 100644
> > --- a/arch/arm/mach-omap2/usb-host.c
> > +++ b/arch/arm/mach-omap2/usb-host.c
> > @@ -28,51 +28,28 @@
> 
> > +	oh[0] = omap_hwmod_lookup(USBHS_UHH_HWMODNAME);
> > +	if (!oh[0]) {
> > +		pr_err("Could not look up %s\n", USBHS_UHH_HWMODNAME);
> > +		return;
> >  	}
> >  
> > -	if (platform_device_register(&usbhs_device) < 0)
> > -		printk(KERN_ERR "USBHS platform_device_register failed\n");
> > +	oh[1] = omap_hwmod_lookup(USBHS_TLL_HWMODNAME);
> > +	if (!oh[1]) {
> > +		pr_err("Could not look up %s\n", USBHS_TLL_HWMODNAME);
> > +		return;
> > +	}
> >  
> > -init_end:
> > -	return;
> > +	od = omap_device_build_ss(OMAP_USBHS_DEVICE, bus_id, oh, 2,
> > +				(void *)&usbhs_data, sizeof(usbhs_data),
> > +				omap_uhhtll_latency,
> > +				ARRAY_SIZE(omap_uhhtll_latency), false);
> 
> Usually there's something wrong with omap_devices that contain 
> multiple hwmods.  Is there some reason why there isn't a separate driver 
> for the TLL?  Judging by a brief look at drivers/mfd/omap_usb_host.c, the 
> TLL handling looks logically distinct?

Yes, I have the same feeling. To my understanding, USB Host Subsystem on
OMAP is composed of the Transceiver-less link (TLL) and USB Host (UHH).
Aparently, they could be handled by separate drivers.

-- 
balbi

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