From: Thor Thayer <thor.thayer@xxxxxxxxxxxxxxx>
Add a clock to the SMMU structure. In the device tree case,
check for a clock handle and enable the clock if found.
Signed-off-by: Thor Thayer <thor.thayer@xxxxxxxxxxxxxxx>
---
drivers/iommu/arm-smmu.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 69e7c60792a8..0e6dd5019c23 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -212,6 +212,7 @@ struct arm_smmu_device {
/* IOMMU core code handle */
struct iommu_device iommu;
+ struct clk *clk;
};
enum arm_smmu_context_fmt {
@@ -1992,6 +1993,15 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
struct device *dev = &pdev->dev;
bool legacy_binding;
+ /* If a clock is declared, enable it */
+ smmu->clk = devm_clk_get(smmu->dev, NULL);
+ if (IS_ERR(smmu->clk)) {
+ smmu->clk = NULL;
+ dev_dbg(dev, "cannot get smmu clock\n");
+ } else {
+ clk_prepare_enable(smmu->clk);
+ }
+
if (of_property_read_u32(dev->of_node, "#global-interrupts",
&smmu->num_global_irqs)) {
dev_err(dev, "missing #global-interrupts property\n");
@@ -2181,6 +2191,10 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
/* Turn the thing off */
writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
+
+ if (smmu->clk)
+ clk_disable_unprepare(smmu->clk);
+
return 0;
}
@@ -2193,6 +2207,9 @@ static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
{
struct arm_smmu_device *smmu = dev_get_drvdata(dev);
+ if (smmu->clk)
+ clk_prepare_enable(smmu->clk);
+
arm_smmu_device_reset(smmu);
return 0;
}
--
2.7.4
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