linux-kernel - Re: [PATCH 9/9] mfd: ab8500-core: Pass GPADC compatible string to MFD core

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Date:	Tue, 14 May 2013 10:46:58 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 9/9] mfd: ab8500-core: Pass GPADC compatible string to MFD core

On Wed, May 8, 2013 at 3:29 PM, Lee Jones <lee.jones@...aro.org> wrote:

> When booting with Device Tree enabled the MFD core uses each device's
> compatible string to find and allocate its associated of_node pointer,
> which in turn is passed to the driver via the platform_device struct.
> Without it, the driver won't be able to interrogate the Device Tree or
> locate suitable regulators and will most likely fail to probe.
>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

Can you explain what regression this is causing since the GPADC
driver (drivers/mfd/ab8500-gpadc.c) does not support device tree
probing and does not have an .of_match_table defined in it's
driver struct? I mean, what could possibly match that
compatible string? The .name field will take care of naming
the device does it not?

For non-emergency merging though:
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Since it matches the example in
Documentation/devicetree/bindings/mfd/ab8500.txt

But for this to make sense the AB8500 ADC driver needs
to be augmented for DT probing and preferrably also moved
to drivers/adc and made to utilize that subsystem.

Yours,
Linus Walleij
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