[PATCH V2] GPIO PL061: Adding Clk framework support
From: Viresh KUMAR <hidden>
Date: 2010-06-21 06:57:43
Subsystem:
gpio subsystem, the rest · Maintainers:
Linus Walleij, Bartosz Golaszewski, Linus Torvalds
From: Viresh KUMAR <redacted> GPIO Clk is never enabled on Platforms, like: SPEAr, which are based upon clock framework and use PL061 driver. This patch adds support for Clk enabling and disabling as and when gpios are requested and freed. Modifications since V1: - Removed usage_count, as already done by clk framework. - Checking error case of clk_enable. Signed-off-by: Viresh Kumar <redacted> --- drivers/gpio/pl061.c | 37 ++++++++++++++++++++++++++++++++++--- 1 files changed, 34 insertions(+), 3 deletions(-)
diff --git a/drivers/gpio/pl061.c b/drivers/gpio/pl061.c
index 105701a..fd37349 100644
--- a/drivers/gpio/pl061.c
+++ b/drivers/gpio/pl061.c@@ -11,7 +11,10 @@ * * Data sheet: ARM DDI 0190B, September 2000 */ + +#include <linux/clk.h> #include <linux/spinlock.h> +#include <linux/err.h> #include <linux/errno.h> #include <linux/module.h> #include <linux/list.h>
@@ -56,8 +59,26 @@ struct pl061_gpio { void __iomem *base; unsigned irq_base; struct gpio_chip gc; + struct clk *clk; }; +static int pl061_request(struct gpio_chip *gc, unsigned offset) +{ + struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc); + + if (offset >= gc->ngpio) + return -EINVAL; + + return clk_enable(chip->clk); +} + +static void pl061_free(struct gpio_chip *gc, unsigned offset) +{ + struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc); + + clk_disable(chip->clk); +} + static int pl061_direction_input(struct gpio_chip *gc, unsigned offset) { struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
@@ -260,10 +281,18 @@ static int __init pl061_probe(struct amba_device *dev, struct amba_id *id) goto release_region; } + chip->clk = clk_get(&dev->dev, NULL); + if (IS_ERR(chip->clk)) { + ret = PTR_ERR(chip->clk); + goto iounmap; + } + spin_lock_init(&chip->lock); spin_lock_init(&chip->irq_lock); INIT_LIST_HEAD(&chip->list); + chip->gc.request = pl061_request; + chip->gc.free = pl061_free; chip->gc.direction_input = pl061_direction_input; chip->gc.direction_output = pl061_direction_output; chip->gc.get = pl061_get_value;
@@ -279,7 +308,7 @@ static int __init pl061_probe(struct amba_device *dev, struct amba_id *id) ret = gpiochip_add(&chip->gc); if (ret) - goto iounmap; + goto free_clk; /* * irq_chip support
@@ -292,7 +321,7 @@ static int __init pl061_probe(struct amba_device *dev, struct amba_id *id) irq = dev->irq[0]; if (irq < 0) { ret = -ENODEV; - goto iounmap; + goto free_clk; } set_irq_chained_handler(irq, pl061_irq_handler); if (!test_and_set_bit(irq, init_irq)) { /* list initialized? */
@@ -300,7 +329,7 @@ static int __init pl061_probe(struct amba_device *dev, struct amba_id *id) if (chip_list == NULL) { clear_bit(irq, init_irq); ret = -ENOMEM; - goto iounmap; + goto free_clk; } INIT_LIST_HEAD(chip_list); set_irq_data(irq, chip_list);
@@ -323,6 +352,8 @@ static int __init pl061_probe(struct amba_device *dev, struct amba_id *id) return 0; +free_clk: + clk_put(chip->clk); iounmap: iounmap(chip->base); release_region:
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1.6.0.2