linux-kernel - Re: [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller

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Date:	Mon, 7 Jul 2014 10:33:38 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Harini Katakam <harinik@...inx.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Michal Simek <michal.simek@...inx.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Harini Katakam <harinikatakamlinux@...il.com>,
	Harini Katakam <harini.katakam@...inx.com>
Subject: Re: [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller

On Mon, 2014-07-07 at 04:45PM +0200, Linus Walleij wrote:
> On Wed, Jun 18, 2014 at 1:39 PM, Harini Katakam <harinik@...inx.com> wrote:
> 
> > From: Harini Katakam <harini.katakam@...inx.com>
> >
> > Add support for GPIO controller used by Xilinx Zynq.
> >
> > Signed-off-by: Harini Katakam <harinik@...inx.com>
> > Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> > ---
> >
> > v2 changes:
> >  - convert to pm_runtime_force_(suspend|resume)
> >  - add pm_runtime_set_active in probe()
> >  - also (un)prepare clocks when they are dis-/enabled
> >  - add some missing calls to pm_runtime_get()
> >  - use pm_runtime_put() instead of sync variant
> >  - remove gpio chip in driver remove()
> >  - remove redundant type casts
> >  - directly use IO helpers
> >  - use BIT macro to set/clear bits
> >  - migrate to GPIOLIB_IRQCHIP
> 
> This is a great improvement! Only small stuff remains.
> 
> > +#include <linux/bitops.h>
> > +#include <linux/clk.h>
> > +#include <linux/gpio.h>
> 
> This should be:
> #include <linux/gpio/driver.h>
> 
> If that doesn't work ... why?
Works just fine.

> 
> > +/**
> > + * struct zynq_gpio - gpio device private data structure
> > + * @chip:      instance of the gpio_chip
> > + * @base_addr: base address of the GPIO device
> > + * @irq:       irq associated with the controller
> > + * @clk:       clock resource for this controller
> > + */
> > +struct zynq_gpio {
> > +       struct gpio_chip chip;
> > +       void __iomem *base_addr;
> > +       int irq;
> 
> Why is irq kept around in this struct? It looks like it could just
> be a local variable in probe()?
You're right.

I think that were both part of the legacy in this driver.

	Sören

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