ixp4xx_eth: Stop referring to GPIOs

The driver is being passed interrupts, then looking up the
same interrupts as GPIOs a second time to convert them into
interrupts and set properties on them.

This is pointless: the GPIO and irqchip APIs of a GPIO chip
are orthogonal. Just request the interrupts and be done
with it, drop reliance on any GPIO functions or definitions.

Use devres-managed functions and add a small devress quirk
to unregister the clock as well and we can rely on devres
to handle all the resources and cut down a bunch of
boilerplate in the process.

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/xscale/ptp_ixp46x.c

@@ -7,7 +7,6 @@
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -23,8 +22,6 @@
 
 #define DRIVER		"ptp_ixp46x"
 #define N_EXT_TS	2
-#define MASTER_GPIO	8
-#define SLAVE_GPIO	7
 
 struct ixp_clock {
 	struct ixp46x_ts_regs *regs;
@@ -245,38 +242,6 @@ static const struct ptp_clock_info ptp_ixp_caps = {
 
 static struct ixp_clock ixp_clock;
 
-static int setup_interrupt(int gpio)
-{
-	int irq;
-	int err;
-
-	err = gpio_request(gpio, "ixp4-ptp");
-	if (err)
-		return err;
-
-	err = gpio_direction_input(gpio);
-	if (err)
-		return err;
-
-	irq = gpio_to_irq(gpio);
-	if (irq < 0)
-		return irq;
-
-	err = irq_set_irq_type(irq, IRQF_TRIGGER_FALLING);
-	if (err) {
-		pr_err("cannot set trigger type for irq %d\n", irq);
-		return err;
-	}
-
-	err = request_irq(irq, isr, 0, DRIVER, &ixp_clock);
-	if (err) {
-		pr_err("request_irq failed for irq %d\n", irq);
-		return err;
-	}
-
-	return irq;
-}
-
 int ixp46x_ptp_find(struct ixp46x_ts_regs *__iomem *regs, int *phc_index)
 {
 	*regs = ixp_clock.regs;
@@ -289,18 +254,20 @@ int ixp46x_ptp_find(struct ixp46x_ts_regs *__iomem *regs, int *phc_index)
 }
 EXPORT_SYMBOL_GPL(ixp46x_ptp_find);
 
-static int ptp_ixp_remove(struct platform_device *pdev)
+/* Called from the registered devm action */
+static void ptp_ixp_unregister_action(void *d)
 {
-	free_irq(ixp_clock.master_irq, &ixp_clock);
-	free_irq(ixp_clock.slave_irq, &ixp_clock);
-	ptp_clock_unregister(ixp_clock.ptp_clock);
-	ixp_clock.ptp_clock = NULL;
+	struct ptp_clock *ptp_clock = d;
 
-	return 0;
+	ptp_clock_unregister(ptp_clock);
+	ixp_clock.ptp_clock = NULL;
 }
 
 static int ptp_ixp_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
+	int ret;
+
 	ixp_clock.regs = devm_platform_ioremap_resource(pdev, 0);
 	ixp_clock.master_irq = platform_get_irq(pdev, 0);
 	ixp_clock.slave_irq = platform_get_irq(pdev, 1);
@@ -315,34 +282,39 @@ static int ptp_ixp_probe(struct platform_device *pdev)
 	if (IS_ERR(ixp_clock.ptp_clock))
 		return PTR_ERR(ixp_clock.ptp_clock);
 
+	ret = devm_add_action_or_reset(dev, ptp_ixp_unregister_action,
+				       ixp_clock.ptp_clock);
+	if (ret) {
+		dev_err(dev, "failed to install clock removal handler\n");
+		return ret;
+	}
+
 	__raw_writel(DEFAULT_ADDEND, &ixp_clock.regs->addend);
 	__raw_writel(1, &ixp_clock.regs->trgt_lo);
 	__raw_writel(0, &ixp_clock.regs->trgt_hi);
 	__raw_writel(TTIPEND, &ixp_clock.regs->event);
 
-	if (ixp_clock.master_irq != setup_interrupt(MASTER_GPIO)) {
-		pr_err("failed to setup gpio %d as irq\n", MASTER_GPIO);
-		goto no_master;
-	}
-	if (ixp_clock.slave_irq != setup_interrupt(SLAVE_GPIO)) {
-		pr_err("failed to setup gpio %d as irq\n", SLAVE_GPIO);
-		goto no_slave;
-	}
+	ret = devm_request_irq(dev, ixp_clock.master_irq, isr,
+			       0, DRIVER, &ixp_clock);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "request_irq failed for irq %d\n",
+				     ixp_clock.master_irq);
+
+	ret = devm_request_irq(dev, ixp_clock.slave_irq, isr,
+			       0, DRIVER, &ixp_clock);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "request_irq failed for irq %d\n",
+				     ixp_clock.slave_irq);
 
 	return 0;
-no_slave:
-	free_irq(ixp_clock.master_irq, &ixp_clock);
-no_master:
-	ptp_clock_unregister(ixp_clock.ptp_clock);
-	ixp_clock.ptp_clock = NULL;
-	return -ENODEV;
 }
 
 static struct platform_driver ptp_ixp_driver = {
 	.driver.name = "ptp-ixp46x",
 	.driver.suppress_bind_attrs = true,
 	.probe = ptp_ixp_probe,
-	.remove = ptp_ixp_remove,
 };
 module_platform_driver(ptp_ixp_driver);