irqchip: renesas-irqc: Add minimal runtime PM support
This is just enough to let pm_clk_*() enable the functional clock, and
manage it for suspend/resume, if present.
Before, it was assumed enabled by the bootloader or reset state.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Link: https://lkml.kernel.org/r/1426704961-27322-3-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 44fe04a..2fe9612 100644
--- a/drivers/irqchip/irq-renesas-irqc.c
+++ b/drivers/irqchip/irq-renesas-irqc.c
@@ -29,6 +29,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_data/irq-renesas-irqc.h>
+#include <linux/pm_runtime.h>
#define IRQC_IRQ_MAX 32 /* maximum 32 interrupts per driver instance */
@@ -180,6 +181,9 @@
p->pdev = pdev;
platform_set_drvdata(pdev, p);
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
/* get hold of manadatory IOMEM */
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!io) {
@@ -260,6 +264,8 @@
err2:
iounmap(p->iomem);
err1:
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
kfree(p);
err0:
return ret;
@@ -275,6 +281,8 @@
irq_domain_remove(p->irq_domain);
iounmap(p->iomem);
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
kfree(p);
return 0;
}