linux-kernel - Re: [Linaro-acpi] [RFC PATCH for Juno 1/2] net: smsc911x add support for probing from ACPI

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Message-ID: <20140901152854.GJ2953@xora-haswell.xora.org.uk>
Date:	Mon, 1 Sep 2014 16:28:54 +0100
From:	Graeme Gregory <graeme.gregory@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linaro-acpi@...ts.linaro.org, Rob Herring <robh@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	linux-acpi@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Robert Moore <robert.moore@...el.com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Olof Johansson <olof@...om.net>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-arm-kernel@...ts.infradead.org, Lv Zheng <lv.zheng@...el.com>
Subject: Re: [Linaro-acpi] [RFC PATCH for Juno 1/2] net: smsc911x add support
 for probing from ACPI

On Mon, Sep 01, 2014 at 05:17:51PM +0200, Arnd Bergmann wrote:
> On Monday 01 September 2014 23:06:00 Hanjun Guo wrote:
> > +#ifdef CONFIG_ACPI
> > +/* Configure some sensible defaults for ACPI mode */
> > +static int smsc911x_probe_config_acpi(struct smsc911x_platform_config *config,
> > +                                   acpi_handle *ahandle)
> > +{
> > +       if (!ahandle)
> > +               return -ENOSYS;
> > +
> > +       config->phy_interface = PHY_INTERFACE_MODE_MII;
> > 
> 
> Please remove the #ifdef and use 
> 
> 	if (!IS_ENABLED(CONFIG_ACPI) || !ahandle)
> 
> to check for ACPI support. This should result in the same object code
> in all cases, but give better compile-time coverage when ACPI is
> disabled.
> 
struct acpi_handle does not exist in the case !CONFIG_ACPI

> Also, -ENOSYS is probably the wrong return value. I think you mean
> -ENXIO.
> 
Yes that would make sense thanks.

Not sure if we are planning to actually upstream this patch, I guess it
depends if ARM start shipping Junos with the ACPI tables loaded on them.

Graeme

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