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From e22b78a24fb729fc970326e55843376852339885 Mon Sep 17 00:00:00 2001
From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Wed, 7 Aug 2013 11:03:17 +0200
Subject: [PATCH 0571/1302] iommu/exynos: add dummy driver for enabling runtime
pm for mem port devices
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
---
drivers/iommu/exynos-iommu.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 01d1c62..76f423d 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1319,3 +1319,37 @@ static int __init exynos_iommu_init(void)
return ret;
}
arch_initcall(exynos_iommu_init);
+
+/*
+ * Dummy driver to enable runtime power management for memport
+ * devices, which required for correct Exynos SYSMMU operation.
+ * Must be registered before drivers, which will use memport nodes.
+ */
+static int __init exynos_memport_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ pm_runtime_enable(dev);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static struct of_device_id memport_of_match[] __initconst = {
+ { .compatible = "samsung,memport", },
+ { },
+};
+#endif
+
+static struct platform_driver exynos_memport_driver __refdata = {
+ .probe = exynos_memport_probe,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "exynos-memport",
+ .of_match_table = of_match_ptr(memport_of_match),
+ }
+};
+
+static int __init exynos_memport_init(void)
+{
+ return platform_driver_register(&exynos_memport_driver);
+}
+subsys_initcall(exynos_memport_init);
--
1.8.3.2
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