linux-kernel - Re: [PATCH] hwmon: twl4030-madc-hwmon: Add device tree support.

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Message-ID: <20140216174430.GA26036@earth.universe>
Date:	Sun, 16 Feb 2014 18:44:30 +0100
From:	Sebastian Reichel <sre@...g0.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Belisko Marek <marek.belisko@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"rob@...dley.net" <rob@...dley.net>,
	"jdelvare@...e.de" <jdelvare@...e.de>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"hns@...delico.com" <hns@...delico.com>
Subject: Re: [PATCH] hwmon: twl4030-madc-hwmon: Add device tree support.

On Sun, Feb 16, 2014 at 08:39:54AM -0800, Guenter Roeck wrote:
> On 02/14/2014 06:08 AM, Belisko Marek wrote:
> >On Fri, Feb 14, 2014 at 2:31 PM, Mark Rutland <mark.rutland@....com> wrote:
> >>On Fri, Feb 14, 2014 at 01:20:58PM +0000, Marek Belisko wrote:
> >>>Signed-off-by: Marek Belisko <marek@...delico.com>
> >>>---
> >>>  Documentation/devicetree/bindings/hwmon/twl4030-madc-hwmon.txt |  9 +++++++++
> >>>  drivers/hwmon/twl4030-madc-hwmon.c                             | 10 ++++++++++
> >>>  2 files changed, 19 insertions(+)
> >>>  create mode 100644 Documentation/devicetree/bindings/hwmon/twl4030-madc-hwmon.txt
> >>>
> >>>diff --git a/Documentation/devicetree/bindings/hwmon/twl4030-madc-hwmon.txt b/Documentation/devicetree/bindings/hwmon/twl4030-madc-hwmon.txt
> >>>new file mode 100644
> >>>index 0000000..e8016d1
> >>>--- /dev/null
> >>>+++ b/Documentation/devicetree/bindings/hwmon/twl4030-madc-hwmon.txt
> >>>@@ -0,0 +1,9 @@
> >>>+TWL4030 MADC hwmon.
> >>>+
> >>>+Required properties:
> >>>+- compatible: "ti,twl4030-madc-hwmon"
> >>>+
> >>>+Example:
> >>>+madc-hwmon {
> >>>+     compatible = "ti,twl4030-madc-hwmon";
> >>>+};
> >>
> >>Huh?
> >>
> >>What is this a binding for? From a look at the driver in mainline this
> >>just calls into functions from the twl4030 madc driver (which doesn't
> >>seem to have a binding).
> >I post bindings for twl4030-madc [1]. Without probing this driver
> >other things will not work (twl4030-madc-battery e.g.).
> >Is there better way to handle this situation?
> 
> Since you are converting twl4030-madc to be an iio driver,
> can't you simply use the iio_hwmon bridge and declare this driver
> obsolete ?

He didn't convert the driver, I did. That's why he included this
change.

I was thinking of using the iio_hwmon bridge and deprecating the
madc-hwmon driver. I have not tested this, though (lack of time).

-- Sebastian

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