linux-kernel - Re: [PATCH 1/3] arm: omap: hwmod: add a new addr space in otg for writing to control module

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Message-ID: <20120906171301.GC17754@arwen.pp.htv.fi>
Date:	Thu, 6 Sep 2012 20:13:03 +0300
From:	Felipe Balbi <balbi@...com>
To:	Vaibhav Hiremath <hvaibhav@...com>
Cc:	Kishon Vijay Abraham I <kishon@...com>, grant.likely@...retlab.ca,
	rob.herring@...xeda.com, rob@...dley.net, b-cousson@...com,
	tony@...mide.com, linux@....linux.org.uk, balbi@...com,
	gregkh@...uxfoundation.org, 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
Subject: Re: [PATCH 1/3] arm: omap: hwmod: add a new addr space in otg for
 writing to control module

Hi,

On Thu, Sep 06, 2012 at 09:04:58PM +0530, Vaibhav Hiremath wrote:
> 
> 
> On 9/6/2012 8:25 PM, Kishon Vijay Abraham I wrote:
> > The mailbox register for usb otg in omap is present in control module.
> > On detection of any events VBUS or ID, this register should be written
> > to send the notification to musb core.
> > 
> > Till we have a separate control module driver to write to control module,
> > omap2430 will handle the register writes to control module by itself. So
> > a new address space to represent this control module register is added
> > to usb_otg_hs.
> > 
> > Cc: Benoit Cousson <b-cousson@...com>
> > Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> > ---
> >  arch/arm/mach-omap2/omap_hwmod_44xx_data.c |    5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
> > index 242aee4..02341bc 100644
> > --- a/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
> > +++ b/arch/arm/mach-omap2/omap_hwmod_44xx_data.c
> > @@ -5890,6 +5890,11 @@ static struct omap_hwmod_addr_space omap44xx_usb_otg_hs_addrs[] = {
> >  		.pa_end		= 0x4a0ab003,
> >  		.flags		= ADDR_TYPE_RT
> >  	},
> > +	{
> > +		.pa_start	= 0x4a00233c,
> > +		.pa_end		= 0x4a00233f,
> > +		.flags		= ADDR_TYPE_RT
> > +	},
> 
> I do not have any objection/comment here, but I believe this is control
> module address space required for USB module, right?
> I am not sure this is right way of accessing control module space.
> Actually Control Module Access required for drivers is one of the
> blocking issue we have currently.
> 
> Also there was some effort put up by 'Konstantine' to convert Control
> module to MFD driver, I haven't seen any further update on it. But it
> would be good to check with him.

this was an agreement with Benoit since we already lost a couple merge
windows for this patchset. We agreed to wait until -rc4 for SCM driver
and if it wasn't ready, we'd go ahead with this and SCM author would fix
it up on a patch converting users to new SCM driver.

-- 
balbi

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