linux-stable/drivers/gpio/gpio-bcm-kona.c
Linus Walleij 57ef04288a gpio: switch drivers to use new callback
This switches all GPIO and pin control drivers with irqchips
that were using .startup() and .shutdown() callbacks to lock
GPIO lines for IRQ usage over to using the .request_resources()
and .release_resources() callbacks just introduced into the
irqchip vtable.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-03-18 09:28:30 +01:00

681 lines
18 KiB
C

/*
* Copyright (C) 2012-2014 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/irqchip/chained_irq.h>
#define BCM_GPIO_PASSWD 0x00a5a501
#define GPIO_PER_BANK 32
#define GPIO_MAX_BANK_NUM 8
#define GPIO_BANK(gpio) ((gpio) >> 5)
#define GPIO_BIT(gpio) ((gpio) & (GPIO_PER_BANK - 1))
/* There is a GPIO control register for each GPIO */
#define GPIO_CONTROL(gpio) (0x00000100 + ((gpio) << 2))
/* The remaining registers are per GPIO bank */
#define GPIO_OUT_STATUS(bank) (0x00000000 + ((bank) << 2))
#define GPIO_IN_STATUS(bank) (0x00000020 + ((bank) << 2))
#define GPIO_OUT_SET(bank) (0x00000040 + ((bank) << 2))
#define GPIO_OUT_CLEAR(bank) (0x00000060 + ((bank) << 2))
#define GPIO_INT_STATUS(bank) (0x00000080 + ((bank) << 2))
#define GPIO_INT_MASK(bank) (0x000000a0 + ((bank) << 2))
#define GPIO_INT_MSKCLR(bank) (0x000000c0 + ((bank) << 2))
#define GPIO_PWD_STATUS(bank) (0x00000500 + ((bank) << 2))
#define GPIO_GPPWR_OFFSET 0x00000520
#define GPIO_GPCTR0_DBR_SHIFT 5
#define GPIO_GPCTR0_DBR_MASK 0x000001e0
#define GPIO_GPCTR0_ITR_SHIFT 3
#define GPIO_GPCTR0_ITR_MASK 0x00000018
#define GPIO_GPCTR0_ITR_CMD_RISING_EDGE 0x00000001
#define GPIO_GPCTR0_ITR_CMD_FALLING_EDGE 0x00000002
#define GPIO_GPCTR0_ITR_CMD_BOTH_EDGE 0x00000003
#define GPIO_GPCTR0_IOTR_MASK 0x00000001
#define GPIO_GPCTR0_IOTR_CMD_0UTPUT 0x00000000
#define GPIO_GPCTR0_IOTR_CMD_INPUT 0x00000001
#define GPIO_GPCTR0_DB_ENABLE_MASK 0x00000100
#define LOCK_CODE 0xffffffff
#define UNLOCK_CODE 0x00000000
struct bcm_kona_gpio {
void __iomem *reg_base;
int num_bank;
spinlock_t lock;
struct gpio_chip gpio_chip;
struct irq_domain *irq_domain;
struct bcm_kona_gpio_bank *banks;
struct platform_device *pdev;
};
struct bcm_kona_gpio_bank {
int id;
int irq;
/* Used in the interrupt handler */
struct bcm_kona_gpio *kona_gpio;
};
static inline struct bcm_kona_gpio *to_kona_gpio(struct gpio_chip *chip)
{
return container_of(chip, struct bcm_kona_gpio, gpio_chip);
}
static inline void bcm_kona_gpio_write_lock_regs(void __iomem *reg_base,
int bank_id, u32 lockcode)
{
writel(BCM_GPIO_PASSWD, reg_base + GPIO_GPPWR_OFFSET);
writel(lockcode, reg_base + GPIO_PWD_STATUS(bank_id));
}
static void bcm_kona_gpio_lock_gpio(struct bcm_kona_gpio *kona_gpio,
unsigned gpio)
{
u32 val;
unsigned long flags;
int bank_id = GPIO_BANK(gpio);
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id));
val |= BIT(gpio);
bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val);
spin_unlock_irqrestore(&kona_gpio->lock, flags);
}
static void bcm_kona_gpio_unlock_gpio(struct bcm_kona_gpio *kona_gpio,
unsigned gpio)
{
u32 val;
unsigned long flags;
int bank_id = GPIO_BANK(gpio);
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(kona_gpio->reg_base + GPIO_PWD_STATUS(bank_id));
val &= ~BIT(gpio);
bcm_kona_gpio_write_lock_regs(kona_gpio->reg_base, bank_id, val);
spin_unlock_irqrestore(&kona_gpio->lock, flags);
}
static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
int bank_id = GPIO_BANK(gpio);
int bit = GPIO_BIT(gpio);
u32 val, reg_offset;
unsigned long flags;
kona_gpio = to_kona_gpio(chip);
reg_base = kona_gpio->reg_base;
spin_lock_irqsave(&kona_gpio->lock, flags);
/* determine the GPIO pin direction */
val = readl(reg_base + GPIO_CONTROL(gpio));
val &= GPIO_GPCTR0_IOTR_MASK;
/* this function only applies to output pin */
if (GPIO_GPCTR0_IOTR_CMD_INPUT == val)
goto out;
reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
val = readl(reg_base + reg_offset);
val |= BIT(bit);
writel(val, reg_base + reg_offset);
out:
spin_unlock_irqrestore(&kona_gpio->lock, flags);
}
static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
int bank_id = GPIO_BANK(gpio);
int bit = GPIO_BIT(gpio);
u32 val, reg_offset;
unsigned long flags;
kona_gpio = to_kona_gpio(chip);
reg_base = kona_gpio->reg_base;
spin_lock_irqsave(&kona_gpio->lock, flags);
/* determine the GPIO pin direction */
val = readl(reg_base + GPIO_CONTROL(gpio));
val &= GPIO_GPCTR0_IOTR_MASK;
/* read the GPIO bank status */
reg_offset = (GPIO_GPCTR0_IOTR_CMD_INPUT == val) ?
GPIO_IN_STATUS(bank_id) : GPIO_OUT_STATUS(bank_id);
val = readl(reg_base + reg_offset);
spin_unlock_irqrestore(&kona_gpio->lock, flags);
/* return the specified bit status */
return !!(val & BIT(bit));
}
static int bcm_kona_gpio_request(struct gpio_chip *chip, unsigned gpio)
{
struct bcm_kona_gpio *kona_gpio = to_kona_gpio(chip);
bcm_kona_gpio_unlock_gpio(kona_gpio, gpio);
return 0;
}
static void bcm_kona_gpio_free(struct gpio_chip *chip, unsigned gpio)
{
struct bcm_kona_gpio *kona_gpio = to_kona_gpio(chip);
bcm_kona_gpio_lock_gpio(kona_gpio, gpio);
}
static int bcm_kona_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
u32 val;
unsigned long flags;
kona_gpio = to_kona_gpio(chip);
reg_base = kona_gpio->reg_base;
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(reg_base + GPIO_CONTROL(gpio));
val &= ~GPIO_GPCTR0_IOTR_MASK;
val |= GPIO_GPCTR0_IOTR_CMD_INPUT;
writel(val, reg_base + GPIO_CONTROL(gpio));
spin_unlock_irqrestore(&kona_gpio->lock, flags);
return 0;
}
static int bcm_kona_gpio_direction_output(struct gpio_chip *chip,
unsigned gpio, int value)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
int bank_id = GPIO_BANK(gpio);
int bit = GPIO_BIT(gpio);
u32 val, reg_offset;
unsigned long flags;
kona_gpio = to_kona_gpio(chip);
reg_base = kona_gpio->reg_base;
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(reg_base + GPIO_CONTROL(gpio));
val &= ~GPIO_GPCTR0_IOTR_MASK;
val |= GPIO_GPCTR0_IOTR_CMD_0UTPUT;
writel(val, reg_base + GPIO_CONTROL(gpio));
reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
val = readl(reg_base + reg_offset);
val |= BIT(bit);
writel(val, reg_base + reg_offset);
spin_unlock_irqrestore(&kona_gpio->lock, flags);
return 0;
}
static int bcm_kona_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
{
struct bcm_kona_gpio *kona_gpio;
kona_gpio = to_kona_gpio(chip);
if (gpio >= kona_gpio->gpio_chip.ngpio)
return -ENXIO;
return irq_create_mapping(kona_gpio->irq_domain, gpio);
}
static int bcm_kona_gpio_set_debounce(struct gpio_chip *chip, unsigned gpio,
unsigned debounce)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
u32 val, res;
unsigned long flags;
kona_gpio = to_kona_gpio(chip);
reg_base = kona_gpio->reg_base;
/* debounce must be 1-128ms (or 0) */
if ((debounce > 0 && debounce < 1000) || debounce > 128000) {
dev_err(chip->dev, "Debounce value %u not in range\n",
debounce);
return -EINVAL;
}
/* calculate debounce bit value */
if (debounce != 0) {
/* Convert to ms */
debounce /= 1000;
/* find the MSB */
res = fls(debounce) - 1;
/* Check if MSB-1 is set (round up or down) */
if (res > 0 && (debounce & BIT(res - 1)))
res++;
}
/* spin lock for read-modify-write of the GPIO register */
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(reg_base + GPIO_CONTROL(gpio));
val &= ~GPIO_GPCTR0_DBR_MASK;
if (debounce == 0) {
/* disable debounce */
val &= ~GPIO_GPCTR0_DB_ENABLE_MASK;
} else {
val |= GPIO_GPCTR0_DB_ENABLE_MASK |
(res << GPIO_GPCTR0_DBR_SHIFT);
}
writel(val, reg_base + GPIO_CONTROL(gpio));
spin_unlock_irqrestore(&kona_gpio->lock, flags);
return 0;
}
static struct gpio_chip template_chip = {
.label = "bcm-kona-gpio",
.owner = THIS_MODULE,
.request = bcm_kona_gpio_request,
.free = bcm_kona_gpio_free,
.direction_input = bcm_kona_gpio_direction_input,
.get = bcm_kona_gpio_get,
.direction_output = bcm_kona_gpio_direction_output,
.set = bcm_kona_gpio_set,
.set_debounce = bcm_kona_gpio_set_debounce,
.to_irq = bcm_kona_gpio_to_irq,
.base = 0,
};
static void bcm_kona_gpio_irq_ack(struct irq_data *d)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
unsigned gpio = d->hwirq;
int bank_id = GPIO_BANK(gpio);
int bit = GPIO_BIT(gpio);
u32 val;
unsigned long flags;
kona_gpio = irq_data_get_irq_chip_data(d);
reg_base = kona_gpio->reg_base;
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(reg_base + GPIO_INT_STATUS(bank_id));
val |= BIT(bit);
writel(val, reg_base + GPIO_INT_STATUS(bank_id));
spin_unlock_irqrestore(&kona_gpio->lock, flags);
}
static void bcm_kona_gpio_irq_mask(struct irq_data *d)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
unsigned gpio = d->hwirq;
int bank_id = GPIO_BANK(gpio);
int bit = GPIO_BIT(gpio);
u32 val;
unsigned long flags;
kona_gpio = irq_data_get_irq_chip_data(d);
reg_base = kona_gpio->reg_base;
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(reg_base + GPIO_INT_MASK(bank_id));
val |= BIT(bit);
writel(val, reg_base + GPIO_INT_MASK(bank_id));
spin_unlock_irqrestore(&kona_gpio->lock, flags);
}
static void bcm_kona_gpio_irq_unmask(struct irq_data *d)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
unsigned gpio = d->hwirq;
int bank_id = GPIO_BANK(gpio);
int bit = GPIO_BIT(gpio);
u32 val;
unsigned long flags;
kona_gpio = irq_data_get_irq_chip_data(d);
reg_base = kona_gpio->reg_base;
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(reg_base + GPIO_INT_MSKCLR(bank_id));
val |= BIT(bit);
writel(val, reg_base + GPIO_INT_MSKCLR(bank_id));
spin_unlock_irqrestore(&kona_gpio->lock, flags);
}
static int bcm_kona_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
struct bcm_kona_gpio *kona_gpio;
void __iomem *reg_base;
unsigned gpio = d->hwirq;
u32 lvl_type;
u32 val;
unsigned long flags;
kona_gpio = irq_data_get_irq_chip_data(d);
reg_base = kona_gpio->reg_base;
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_RISING:
lvl_type = GPIO_GPCTR0_ITR_CMD_RISING_EDGE;
break;
case IRQ_TYPE_EDGE_FALLING:
lvl_type = GPIO_GPCTR0_ITR_CMD_FALLING_EDGE;
break;
case IRQ_TYPE_EDGE_BOTH:
lvl_type = GPIO_GPCTR0_ITR_CMD_BOTH_EDGE;
break;
case IRQ_TYPE_LEVEL_HIGH:
case IRQ_TYPE_LEVEL_LOW:
/* BCM GPIO doesn't support level triggering */
default:
dev_err(kona_gpio->gpio_chip.dev,
"Invalid BCM GPIO irq type 0x%x\n", type);
return -EINVAL;
}
spin_lock_irqsave(&kona_gpio->lock, flags);
val = readl(reg_base + GPIO_CONTROL(gpio));
val &= ~GPIO_GPCTR0_ITR_MASK;
val |= lvl_type << GPIO_GPCTR0_ITR_SHIFT;
writel(val, reg_base + GPIO_CONTROL(gpio));
spin_unlock_irqrestore(&kona_gpio->lock, flags);
return 0;
}
static void bcm_kona_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
void __iomem *reg_base;
int bit, bank_id;
unsigned long sta;
struct bcm_kona_gpio_bank *bank = irq_get_handler_data(irq);
struct irq_chip *chip = irq_desc_get_chip(desc);
chained_irq_enter(chip, desc);
/*
* For bank interrupts, we can't use chip_data to store the kona_gpio
* pointer, since GIC needs it for its own purposes. Therefore, we get
* our pointer from the bank structure.
*/
reg_base = bank->kona_gpio->reg_base;
bank_id = bank->id;
while ((sta = readl(reg_base + GPIO_INT_STATUS(bank_id)) &
(~(readl(reg_base + GPIO_INT_MASK(bank_id)))))) {
for_each_set_bit(bit, &sta, 32) {
int hwirq = GPIO_PER_BANK * bank_id + bit;
int child_irq =
irq_find_mapping(bank->kona_gpio->irq_domain,
hwirq);
/*
* Clear interrupt before handler is called so we don't
* miss any interrupt occurred during executing them.
*/
writel(readl(reg_base + GPIO_INT_STATUS(bank_id)) |
BIT(bit), reg_base + GPIO_INT_STATUS(bank_id));
/* Invoke interrupt handler */
generic_handle_irq(child_irq);
}
}
chained_irq_exit(chip, desc);
}
static int bcm_kona_gpio_irq_reqres(struct irq_data *d)
{
struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d);
if (gpio_lock_as_irq(&kona_gpio->gpio_chip, d->hwirq)) {
dev_err(kona_gpio->gpio_chip.dev,
"unable to lock HW IRQ %lu for IRQ\n",
d->hwirq);
return -EINVAL;
}
return 0;
}
static void bcm_kona_gpio_irq_relres(struct irq_data *d)
{
struct bcm_kona_gpio *kona_gpio = irq_data_get_irq_chip_data(d);
gpio_unlock_as_irq(&kona_gpio->gpio_chip, d->hwirq);
}
static struct irq_chip bcm_gpio_irq_chip = {
.name = "bcm-kona-gpio",
.irq_ack = bcm_kona_gpio_irq_ack,
.irq_mask = bcm_kona_gpio_irq_mask,
.irq_unmask = bcm_kona_gpio_irq_unmask,
.irq_set_type = bcm_kona_gpio_irq_set_type,
.irq_request_resources = bcm_kona_gpio_irq_reqres,
.irq_release_resources = bcm_kona_gpio_irq_relres,
};
static struct __initconst of_device_id bcm_kona_gpio_of_match[] = {
{ .compatible = "brcm,kona-gpio" },
{}
};
MODULE_DEVICE_TABLE(of, bcm_kona_gpio_of_match);
/*
* This lock class tells lockdep that GPIO irqs are in a different
* category than their parents, so it won't report false recursion.
*/
static struct lock_class_key gpio_lock_class;
static int bcm_kona_gpio_irq_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq)
{
int ret;
ret = irq_set_chip_data(irq, d->host_data);
if (ret < 0)
return ret;
irq_set_lockdep_class(irq, &gpio_lock_class);
irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip, handle_simple_irq);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
irq_set_noprobe(irq);
#endif
return 0;
}
static void bcm_kona_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
{
irq_set_chip_and_handler(irq, NULL, NULL);
irq_set_chip_data(irq, NULL);
}
static struct irq_domain_ops bcm_kona_irq_ops = {
.map = bcm_kona_gpio_irq_map,
.unmap = bcm_kona_gpio_irq_unmap,
.xlate = irq_domain_xlate_twocell,
};
static void bcm_kona_gpio_reset(struct bcm_kona_gpio *kona_gpio)
{
void __iomem *reg_base;
int i;
reg_base = kona_gpio->reg_base;
/* disable interrupts and clear status */
for (i = 0; i < kona_gpio->num_bank; i++) {
/* Unlock the entire bank first */
bcm_kona_gpio_write_lock_regs(kona_gpio, i, UNLOCK_CODE);
writel(0xffffffff, reg_base + GPIO_INT_MASK(i));
writel(0xffffffff, reg_base + GPIO_INT_STATUS(i));
/* Now re-lock the bank */
bcm_kona_gpio_write_lock_regs(kona_gpio, i, LOCK_CODE);
}
}
static int bcm_kona_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct of_device_id *match;
struct resource *res;
struct bcm_kona_gpio_bank *bank;
struct bcm_kona_gpio *kona_gpio;
struct gpio_chip *chip;
int ret;
int i;
match = of_match_device(bcm_kona_gpio_of_match, dev);
if (!match) {
dev_err(dev, "Failed to find gpio controller\n");
return -ENODEV;
}
kona_gpio = devm_kzalloc(dev, sizeof(*kona_gpio), GFP_KERNEL);
if (!kona_gpio)
return -ENOMEM;
kona_gpio->gpio_chip = template_chip;
chip = &kona_gpio->gpio_chip;
kona_gpio->num_bank = of_irq_count(dev->of_node);
if (kona_gpio->num_bank == 0) {
dev_err(dev, "Couldn't determine # GPIO banks\n");
return -ENOENT;
}
if (kona_gpio->num_bank > GPIO_MAX_BANK_NUM) {
dev_err(dev, "Too many GPIO banks configured (max=%d)\n",
GPIO_MAX_BANK_NUM);
return -ENXIO;
}
kona_gpio->banks = devm_kzalloc(dev,
kona_gpio->num_bank *
sizeof(*kona_gpio->banks), GFP_KERNEL);
if (!kona_gpio->banks)
return -ENOMEM;
kona_gpio->pdev = pdev;
platform_set_drvdata(pdev, kona_gpio);
chip->of_node = dev->of_node;
chip->ngpio = kona_gpio->num_bank * GPIO_PER_BANK;
kona_gpio->irq_domain = irq_domain_add_linear(dev->of_node,
chip->ngpio,
&bcm_kona_irq_ops,
kona_gpio);
if (!kona_gpio->irq_domain) {
dev_err(dev, "Couldn't allocate IRQ domain\n");
return -ENXIO;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
kona_gpio->reg_base = devm_ioremap_resource(dev, res);
if (IS_ERR(kona_gpio->reg_base)) {
ret = -ENXIO;
goto err_irq_domain;
}
for (i = 0; i < kona_gpio->num_bank; i++) {
bank = &kona_gpio->banks[i];
bank->id = i;
bank->irq = platform_get_irq(pdev, i);
bank->kona_gpio = kona_gpio;
if (bank->irq < 0) {
dev_err(dev, "Couldn't get IRQ for bank %d", i);
ret = -ENOENT;
goto err_irq_domain;
}
}
dev_info(&pdev->dev, "Setting up Kona GPIO\n");
bcm_kona_gpio_reset(kona_gpio);
ret = gpiochip_add(chip);
if (ret < 0) {
dev_err(dev, "Couldn't add GPIO chip -- %d\n", ret);
goto err_irq_domain;
}
for (i = 0; i < chip->ngpio; i++) {
int irq = bcm_kona_gpio_to_irq(chip, i);
irq_set_lockdep_class(irq, &gpio_lock_class);
irq_set_chip_and_handler(irq, &bcm_gpio_irq_chip,
handle_simple_irq);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
irq_set_noprobe(irq);
#endif
}
for (i = 0; i < kona_gpio->num_bank; i++) {
bank = &kona_gpio->banks[i];
irq_set_chained_handler(bank->irq, bcm_kona_gpio_irq_handler);
irq_set_handler_data(bank->irq, bank);
}
spin_lock_init(&kona_gpio->lock);
return 0;
err_irq_domain:
irq_domain_remove(kona_gpio->irq_domain);
return ret;
}
static struct platform_driver bcm_kona_gpio_driver = {
.driver = {
.name = "bcm-kona-gpio",
.owner = THIS_MODULE,
.of_match_table = bcm_kona_gpio_of_match,
},
.probe = bcm_kona_gpio_probe,
};
module_platform_driver(bcm_kona_gpio_driver);
MODULE_AUTHOR("Broadcom Corporation <bcm-kernel-feedback-list@broadcom.com>");
MODULE_DESCRIPTION("Broadcom Kona GPIO Driver");
MODULE_LICENSE("GPL v2");