| Message ID | 1538605693-22073-3-git-send-email-thor.thayer@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iommu/arm-smmu: Add Stratix10 SMMU Support | expand |
Hi Thor, On 10/4/2018 3:58 AM, thor.thayer@linux.intel.com wrote: > From: Thor Thayer <thor.thayer@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.thayer@linux.intel.com> > --- > drivers/iommu/arm-smmu.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) The clock part is already handled by one of the patch in the runtime pm series of arm-smmu [1]. This patch should not be needed. [1] https://patchwork.kernel.org/patch/10581899/ [...] Regards Vivek
Hi Vivek, On 10/04/2018 01:49 PM, Vivek Gautam wrote: > Hi Thor, > > > On 10/4/2018 3:58 AM, thor.thayer@linux.intel.com wrote: >> From: Thor Thayer <thor.thayer@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 managed version of clk_bulk_get_all" >> https://patchwork.kernel.org/patch/10583139/ >> >> Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com> >> --- >> drivers/iommu/arm-smmu.c | 20 ++++++++++++++++++++ >> 1 file changed, 20 insertions(+) > > The clock part is already handled by one of the patch in the > runtime pm series of arm-smmu [1]. This patch should not be needed. > > [1] https://patchwork.kernel.org/patch/10581899/ > > [...] > > Regards > Vivek > Thanks. FYI, I had problems applying [v16,2/5] on [1] but was able to apply [v17,2/5] cleanly. The bigger issue is that with your patchset I need to create a new structure for my variation of the ARM SMMUv2 due to the of_device_get_match_data() call in arm_smmu_device_dt_probe(). I want to use the default arm_mmu500 but it doesn't have a clock specified and I end up with num_clks of 0. Creating a new smmu_match_data structure for each variant feels wrong because I have the clock data specified in my device tree. The of_clk_bulk_get() call handles this nicely but that patchset isn't getting much attention. I'll investigate adding the of_clk_bulk_get() call on top of your patches. This may simplify your patches too since the additional structures in [v16,5/5] wouldn't be needed. Thanks, Thor [1] git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git - next
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; }