linux-kernel - Re: [PATCH v6 04/10] regulator: fixed: add support for ACPI interface

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Message-ID: <20160427123349.GL3217@sirena.org.uk>
Date:	Wed, 27 Apr 2016 13:33:49 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Lu Baolu <baolu.lu@...ux.intel.com>
Cc:	felipe.balbi@...ux.intel.com,
	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lee Jones <lee.jones@...aro.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 04/10] regulator: fixed: add support for ACPI interface

On Wed, Apr 27, 2016 at 09:54:10AM +0800, Lu Baolu wrote:

> Please refer to Documentation/acpi/gpio-properties.txt.

That's not visibly what your driver is doing, that is also recommending
using a static name which is what I'm asking for.

> > Why does the device care?It's requesting the GPIO in
> > its own context and it's only requesting one GPIO, with DT we're just
> > always calling the GPIO "gpio" which works fine.

> This driver is not bound to an ACPI device node directly. It's a child
> of a mfd device, which is corresponding to a real ACPI device node.

If it's the child of a MFD it's got an ACPI device, the ACPI device is
the parent.  It should use the parent device or the parent should map
the GPIO through to the child as many other MFDs do, the whole concept
of a MFD is a Linux internal implementation detail.

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