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authorJouni Hogander <jouni.hogander@nokia.com>2008-12-10 17:35:24 -0800
committerTony Lindgren <tony@atomide.com>2008-12-10 17:35:24 -0800
commit89db94825447a03f17e03c0a6c8840a0a22cf155 (patch)
tree4f396a91ac3a8d9e277f88ef7fafa6f3985270ec /arch/arm/plat-omap/gpio.c
parent8b1fae4e4200388b64dd88065639413cb3f1051c (diff)
downloadblackbird-op-linux-89db94825447a03f17e03c0a6c8840a0a22cf155.tar.gz
blackbird-op-linux-89db94825447a03f17e03c0a6c8840a0a22cf155.zip
ARM: OMAP: Enable GPIO debounce clock only when debounce is enabled v3
This patch changes gpio "driver" to enable debounce clock for gpio-bank only when debounce is enabled for some gpio in that bank. Gpio functional clocks are also renamed in clock tree, gpioX_fck -> gpioX_dbck. This patch triggers problem with gpio wake-up and Omap3. Gpios in PER domain aren't capable to generate wake-up if PER domain is in sleep state. For this iopad wake-up should be used and needed pad configuration should be done. Enabling iopad wake-up for gpio pads is left for bootloader or omap mux configuration in kernel. Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com> Acked-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/plat-omap/gpio.c')
-rw-r--r--arch/arm/plat-omap/gpio.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 424049d83fbe..66e364738fbb 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -152,6 +152,7 @@ struct gpio_bank {
u32 level_mask;
spinlock_t lock;
struct gpio_chip chip;
+ struct clk *dbck;
};
#define METHOD_MPUIO 0
@@ -484,10 +485,15 @@ void omap_set_gpio_debounce(int gpio, int enable)
reg += OMAP24XX_GPIO_DEBOUNCE_EN;
val = __raw_readl(reg);
- if (enable)
+ if (enable && !(val & l))
val |= l;
- else
+ else if (!enable && val & l)
val &= ~l;
+ else
+ return;
+
+ if (cpu_is_omap34xx())
+ enable ? clk_enable(bank->dbck) : clk_disable(bank->dbck);
__raw_writel(val, reg);
}
@@ -1296,7 +1302,6 @@ static struct clk * gpio5_fck;
#endif
#if defined(CONFIG_ARCH_OMAP3)
-static struct clk *gpio_fclks[OMAP34XX_NR_GPIOS];
static struct clk *gpio_iclks[OMAP34XX_NR_GPIOS];
#endif
@@ -1310,9 +1315,7 @@ static int __init _omap_gpio_init(void)
int i;
int gpio = 0;
struct gpio_bank *bank;
-#if defined(CONFIG_ARCH_OMAP3)
char clk_name[11];
-#endif
initialized = 1;
@@ -1367,12 +1370,6 @@ static int __init _omap_gpio_init(void)
printk(KERN_ERR "Could not get %s\n", clk_name);
else
clk_enable(gpio_iclks[i]);
- sprintf(clk_name, "gpio%d_fck", i + 1);
- gpio_fclks[i] = clk_get(NULL, clk_name);
- if (IS_ERR(gpio_fclks[i]))
- printk(KERN_ERR "Could not get %s\n", clk_name);
- else
- clk_enable(gpio_fclks[i]);
}
}
#endif
@@ -1511,6 +1508,13 @@ static int __init _omap_gpio_init(void)
}
set_irq_chained_handler(bank->irq, gpio_irq_handler);
set_irq_data(bank->irq, bank);
+
+ if (cpu_is_omap34xx()) {
+ sprintf(clk_name, "gpio%d_dbck", i + 1);
+ bank->dbck = clk_get(NULL, clk_name);
+ if (IS_ERR(bank->dbck))
+ printk(KERN_ERR "Could not get %s\n", clk_name);
+ }
}
/* Enable system clock for GPIO module.
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