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 2fe9612041b0e9051d9b9a17c97402a7ef39938b..7be2fdf69924782a7185ef89d789dae2479c00a6 100644 (file)
--- 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 irqc_priv {
        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 @@ static int irqc_irq_set_type(struct irq_data *d, unsigned int type)
        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 @@ static int irqc_probe(struct platform_device *pdev)
        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 @@ static int irqc_probe(struct platform_device *pdev)
        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,