irqchip: renesas-irqc: Add wake-up support
The IRQC module clock is managed through Runtime PM and PM Domains.
If wake-up is enabled, this clock must not be disabled during system
suspend.
Hence implement irq_chip.irq_set_wake(), which increments/decrements the
clock's enable_count when needed.
This fixes wake-up by gpio-keys on r8a73a4/ape6evm.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Link: https://lkml.kernel.org/r/1427889606-18671-1-git-send-email-geert+renesas@glider.be
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
diff --git a/drivers/irqchip/irq-renesas-irqc.c b/drivers/irqchip/irq-renesas-irqc.c
index 2fe9612..7be2fdf 100644
--- a/drivers/irqchip/irq-renesas-irqc.c
+++ b/drivers/irqchip/irq-renesas-irqc.c
@@ -17,6 +17,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/clk.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
@@ -66,6 +67,7 @@
struct platform_device *pdev;
struct irq_chip irq_chip;
struct irq_domain *irq_domain;
+ struct clk *clk;
};
static void irqc_dbg(struct irqc_irq *i, char *str)
@@ -119,6 +121,21 @@
return 0;
}
+static int irqc_irq_set_wake(struct irq_data *d, unsigned int on)
+{
+ struct irqc_priv *p = irq_data_get_irq_chip_data(d);
+
+ if (!p->clk)
+ return 0;
+
+ if (on)
+ clk_enable(p->clk);
+ else
+ clk_disable(p->clk);
+
+ return 0;
+}
+
static irqreturn_t irqc_irq_handler(int irq, void *dev_id)
{
struct irqc_irq *i = dev_id;
@@ -181,6 +198,12 @@
p->pdev = pdev;
platform_set_drvdata(pdev, p);
+ p->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(p->clk)) {
+ dev_warn(&pdev->dev, "unable to get clock\n");
+ p->clk = NULL;
+ }
+
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
@@ -224,7 +247,8 @@
irq_chip->irq_mask = irqc_irq_disable;
irq_chip->irq_unmask = irqc_irq_enable;
irq_chip->irq_set_type = irqc_irq_set_type;
- irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
+ irq_chip->irq_set_wake = irqc_irq_set_wake;
+ irq_chip->flags = IRQCHIP_MASK_ON_SUSPEND;
p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,
p->number_of_irqs,