mvebu: gpio based pwm support

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>

SVN-Revision: 44129

1 files changed, 63 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-3.18/201-gpio_mvebu_fix_probe_cleanup_on_error.patch b/target/linux/mvebu/patches-3.18/201-gpio_mvebu_fix_probe_cleanup_on_error.patch
new file mode 100644
index 0000000000..aecf8e3c12
--- /dev/null
+++ b/target/linux/mvebu/patches-3.18/201-gpio_mvebu_fix_probe_cleanup_on_error.patch
@@ -0,0 +1,63 @@
+Ensure that when there is an error during probe that the gpiochip is
+removed and the generic irq chip is removed.
+
+Signed-off-by: Andrew Lunn <andrew@lunn.ch>
+---
+ drivers/gpio/gpio-mvebu.c | 23 +++++++++++++++++------
+ 1 file changed, 17 insertions(+), 6 deletions(-)
+
+--- a/drivers/gpio/gpio-mvebu.c
++++ b/drivers/gpio/gpio-mvebu.c
+@@ -667,6 +667,7 @@ static int mvebu_gpio_probe(struct platf
+ 	unsigned int ngpios;
+ 	int soc_variant;
+ 	int i, cpu, id;
++	int err;
+ 
+ 	match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
+ 	if (match)
+@@ -785,14 +786,16 @@ static int mvebu_gpio_probe(struct platf
+ 	mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
+ 	if (mvchip->irqbase < 0) {
+ 		dev_err(&pdev->dev, "no irqs\n");
+-		return mvchip->irqbase;
++		err = mvchip->irqbase;
++		goto err_gpiochip_add;
+ 	}
+ 
+ 	gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
+ 				    mvchip->membase, handle_level_irq);
+ 	if (!gc) {
+ 		dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
+-		return -ENOMEM;
++		err = -ENOMEM;
++		goto err_gpiochip_add;
+ 	}
+ 
+ 	gc->private = mvchip;
+@@ -823,13 +826,21 @@ static int mvebu_gpio_probe(struct platf
+ 	if (!mvchip->domain) {
+ 		dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
+ 			mvchip->chip.label);
+-		irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
+-					IRQ_LEVEL | IRQ_NOPROBE);
+-		kfree(gc);
+-		return -ENODEV;
++		err = -ENODEV;
++		goto err_generic_chip;
+ 	}
+ 
+ 	return 0;
++
++err_generic_chip:
++	irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
++				IRQ_LEVEL | IRQ_NOPROBE);
++	kfree(gc);
++
++err_gpiochip_add:
++	gpiochip_remove(&mvchip->chip);
++
++	return err;
+ }
+ 
+ static struct platform_driver mvebu_gpio_driver = {