linux-kernel - Re: [PATCH 1/1] gpio: add a driver for the Synopsys DesignWare APB GPIO block

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Date:	Wed, 6 Nov 2013 23:34:27 +0000
From:	Jamie Iles <jamie@...ieiles.com>
To:	Alan Tull <delicious.quinoa@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-doc@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jamie Iles <jamie@...ieiles.com>,
	Heiko Stuebner <heiko@...ech.de>, Alan Tull <atull@...era.com>,
	Dinh Nguyen <dinguyen@...era.com>,
	Yves Vandervennet <rocket.yvanderv@...il.com>
Subject: Re: [PATCH 1/1] gpio: add a driver for the Synopsys DesignWare APB
 GPIO block

Hi Alan,

On Wed, Nov 06, 2013 at 04:49:42PM -0600, Alan Tull wrote:
> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> new file mode 100644
> index 0000000..7957dfd
> --- /dev/null
> +++ b/drivers/gpio/gpio-dwapb.c
> @@ -0,0 +1,458 @@
> +/*
> + * Copyright (c) 2011 Jamie Iles
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * All enquiries to support@...ochip.com
> + */
> +#include <linux/basic_mmio_gpio.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/ioport.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +#include <linux/spinlock.h>
> +
> +#define GPIO_SWPORTA_DR		0x00
> +#define GPIO_SWPORTA_DDR	0x04
> +#define GPIO_SWPORTB_DR		0x0c
> +#define GPIO_SWPORTB_DDR	0x10
> +#define GPIO_SWPORTC_DR		0x18
> +#define GPIO_SWPORTC_DDR	0x1c
> +#define GPIO_SWPORTD_DR		0x24
> +#define GPIO_SWPORTD_DDR	0x28
> +#define GPIO_INTEN		0x30
> +#define GPIO_INTMASK		0x34
> +#define GPIO_INTTYPE_LEVEL	0x38
> +#define GPIO_INT_POLARITY	0x3c
> +#define GPIO_INTSTATUS		0x40
> +#define GPIO_PORTA_EOI		0x4c
> +#define GPIO_EXT_PORTA		0x50
> +#define GPIO_EXT_PORTB		0x54
> +#define GPIO_EXT_PORTC		0x58
> +#define GPIO_EXT_PORTD		0x5c
> +
> +struct dwapb_gpio;
> +
> +struct dwapb_gpio_port {
> +	struct bgpio_chip	bgc;
> +	bool			is_registered;
> +	struct dwapb_gpio	*gpio;
> +};
> +
> +struct dwapb_gpio {
> +	struct	device		*dev;
> +	void __iomem		*regs;
> +	struct dwapb_gpio_port	*ports;
> +	unsigned int		nr_ports;
> +	struct irq_domain	*domain;
> +	int			hwirq;

I'm not sure I fully understand what hwirq is in this context - is it 
the IRQ line from the Synopsys block to the system interrupt controller?  
If so I don't think this covers all configurations - the Picochip 
devices for instance have each GPIO in port A as an individual IRQ going 
to the VIC.

It looks here like hwirq is used for all of the interrupt registers so 
only one GPIO interrupt is supported?

> +static struct platform_driver dwapb_gpio_driver = {
> +	.driver		= {
> +		.name	= "gpio-dwapb",
> +		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(dwapb_of_match),
> +	},
> +	.probe		= dwapb_gpio_probe,
> +	.remove		= dwapb_gpio_remove,
> +};
> +
> +static int __init dwapb_gpio_init(void)
> +{
> +	return platform_driver_register(&dwapb_gpio_driver);
> +}
> +postcore_initcall(dwapb_gpio_init);
> +
> +static void __exit dwapb_gpio_exit(void)
> +{
> +	platform_driver_unregister(&dwapb_gpio_driver);
> +}
> +module_exit(dwapb_gpio_exit);

We can replace the registration and unregistration with 
module_platform_driver() now.

Jamie
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