linux-kernel - Re: [PATCH v5 2/9] mfd: omap-usb-host: Get clocks based on hardware revision

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Message-ID: <20140110142640.GA32035@lee--X1>
Date:	Fri, 10 Jan 2014 14:26:40 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Roger Quadros <rogerq@...com>, bcousson@...libre.com,
	tony@...mide.com, balbi@...com, sre@...ian.org,
	mark.rutland@....com, m.paolino@...tualopensystems.com,
	linux-omap@...r.kernel.org, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH v5 2/9] mfd: omap-usb-host: Get clocks based on hardware
 revision

On Fri, 10 Jan 2014, Arnd Bergmann wrote:

> On Friday 10 January 2014, Lee Jones wrote:
> > >  
> > > -     need_logic_fck = false;
> > > +     /* Set all clocks as invalid to begin with */
> > > +     omap->ehci_logic_fck = omap->init_60m_fclk = ERR_PTR(-EINVAL);
> > > +     omap->utmi_p1_gfclk = omap->utmi_p2_gfclk = ERR_PTR(-EINVAL);
> > > +     omap->xclk60mhsp1_ck = omap->xclk60mhsp2_ck = ERR_PTR(-EINVAL);
> > 
> > I don't think this is the correct error code.
> > 
> > -EINVAL means 'invalid parameter'.
> > 
> > You probably want -ENODEV or -ENOSYS ('function not implemented'
> > probably isn't ideal either tbh, but you get the idea). Perhaps you
> > can set them as NULL and check for IS_ERR_OR_NULL() instead?
> 
> I think ENODEV is ok here, I'd much prefer this over IS_ERR_OR_NULL().

Sounds good to me.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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