linux-kernel - Re: [PATCH 1/6] mfd: arizona: Factor out read of device tree GPIOs

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Date:	Wed, 16 Apr 2014 10:25:40 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	broonie@...nel.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, rob@...dley.net, sameo@...ux.intel.com,
	lgirdwood@...il.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] mfd: arizona: Factor out read of device tree GPIOs

> > > This patch factors out the reading of GPIOs for the Arizona devices
> > > into a helper function.
> > > 
> > > Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> > > ---
> > >  drivers/mfd/arizona-core.c       |   33 ++++++++++++++++++++++++---------
> > >  include/linux/mfd/arizona/core.h |    3 +++
> > >  2 files changed, 27 insertions(+), 9 deletions(-)

[...]

> > > +EXPORT_SYMBOL_GPL(arizona_of_get_named_gpio);
> > > +
> > 
> > Are you sure you're going to use this externally?
> > 
> > NB: I haven't looked at the remainder of the set yet.
> 
> Yeah we move the ldoena gpio into the LDO driver, and later we
> will be adding a polarity GPIO into the extcon driver.

Okay, just checking.

> > >  static int arizona_of_get_core_pdata(struct arizona *arizona)
> > >  {
> > > +	struct arizona_pdata *pdata = &arizona->pdata;
> > >  	int ret, i;
> > >  
> > > -	arizona->pdata.reset = of_get_named_gpio(arizona->dev->of_node,
> > > -						 "wlf,reset", 0);
> > > -	if (arizona->pdata.reset < 0)
> > > -		arizona->pdata.reset = 0;
> > > -
> > > -	arizona->pdata.ldoena = of_get_named_gpio(arizona->dev->of_node,
> > > -						  "wlf,ldoena", 0);
> > > -	if (arizona->pdata.ldoena < 0)
> > > -		arizona->pdata.ldoena = 0;
> > > +	arizona_of_get_named_gpio(arizona, "wlf,reset", true, &pdata->reset);
> > > +	arizona_of_get_named_gpio(arizona, "wlf,ldoena", true, &pdata->ldoena);
> > 
> > I guess this pdata is populated by DT?
> 
> Yeah that is correct, the Arizona driver populates the pdata from
> the DT then the rest of the driver just uses the pdata in both DT
> and pdata cases.

Sounds ugly when you put it like that, but I know that a _lot_ of
other drivers do the same thing.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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