From: Thor Thayer <thor.tha...@linux.intel.com> Add a clock to the SMMU structure. In the device tree case, check for a clock node and enable the clock if found.
This patch is dependent upon the following patches that add a device tree bulk clock function. "[V6, 1/4] clk: bulk: add of_clk_bulk_get()" https://patchwork.kernel.org/patch/10583133/ "[V6, 2/4] clk: add new APIs to operation on all available clocks" https://patchwork.kernel.org/patch/10583131/ "[V6, 3/4] clk: add managerged version of clk_bulk_get_all" https://patchwork.kernel.org/patch/10583139/ Signed-off-by: Thor Thayer <thor.tha...@linux.intel.com> --- drivers/iommu/arm-smmu.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 5a28ae892504..0f4596b42ca7 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -213,6 +213,8 @@ struct arm_smmu_device { /* IOMMU core code handle */ struct iommu_device iommu; + int num_clks; + struct clk_bulk_data *clks; }; enum arm_smmu_context_fmt { @@ -2038,6 +2040,17 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev, const struct arm_smmu_match_data *data; struct device *dev = &pdev->dev; bool legacy_binding; + int ret; + + /* If a clock is declared, enable it */ + ret = devm_clk_bulk_get_all(smmu->dev, &smmu->clks); + if (IS_ERR(ret)) { + smmu->clks = NULL; + dev_dbg(dev, "cannot get smmu clock\n"); + } else { + smmu->num_clks = ret; + clk_bulk_prepare_enable(smmu->num_clks, smmu->clks); + } if (of_property_read_u32(dev->of_node, "#global-interrupts", &smmu->num_global_irqs)) { @@ -2236,6 +2249,10 @@ 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->clks) + clk_bulk_disable_unprepare(smmu->num_clks, smmu->clks); + return 0; } @@ -2248,6 +2265,9 @@ static int __maybe_unused arm_smmu_pm_resume(struct device *dev) { struct arm_smmu_device *smmu = dev_get_drvdata(dev); + if (smmu->clks) + clk_bulk_prepare_enable(smmu->num_clks, smmu->clks); + arm_smmu_device_reset(smmu); return 0; } -- 2.7.4 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
