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

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Date:	Mon, 15 Sep 2014 10:24:56 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linaro-acpi@...ts.linaro.org" <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" <linux-acpi@...r.kernel.org>,
	Marc Zyngier <Marc.Zyngier@....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" <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" 
	<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 15, 2014 at 05:08:44AM +0100, Grant Likely wrote:
> On Mon, 1 Sep 2014 16:28:54 +0100, Graeme Gregory <graeme.gregory@...aro.org> wrote:
> > 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.
> 
> I think we do want this upstreamed. Juno is intended to be a readily
> available reference platform, regardless of the firmware loaded when
> shipped. There will be users who use it as a test platform for ACPI
> development.

The patches for Juno are not intrusive. The only problem I have is
giving the wrong example on how to deal with the platform-specific
device information like this patch. I would much prefer to use _DSD
(once we agree on how to do this) than hard-coding information based on
the ACPI device id (you would need one for each SoC). I don't think we
have reached an agreement yet:

https://lkml.kernel.org/g/4816592.tj3on6vUaC@wuerfel

-- 
Catalin

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