On 11/27/18 4:11 AM, Vivek Gautam wrote:
From: Sricharan R <sricharan@xxxxxxxxxxxxxx> The smmu needs to be functional only when the respective master's using it are active. The device_link feature helps to track such functional dependencies, so that the iommu gets powered when the master device enables itself using pm_runtime. So by adapting the smmu driver for runtime pm, above said dependency can be addressed. This patch adds the pm runtime/sleep callbacks to the driver and also the functions to parse the smmu clocks from DT and enable them in resume/suspend. We pull all the information about clocks from device tree. Also, while we enable the runtime pm add a pm sleep suspend callback that pushes devices to low power state by turning the clocks off in a system sleep. Also add corresponding clock enable path in resume callback. Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx> Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx> [Thor: Rework to get clocks from device tree] Signed-off-by: Thor Thayer <thor.thayer@xxxxxxxxxxxxxxx> [vivek: rework for clock and pm ops] Signed-off-by: Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx> Reviewed-by: Tomasz Figa <tfiga@xxxxxxxxxxxx> Tested-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx> --- drivers/iommu/arm-smmu.c | 100 +++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 97 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 5a28ae892504..e47c840fc6a8 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -44,10 +44,12 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> +#include <linux/of_clk.h> #include <linux/of_device.h> #include <linux/of_iommu.h> #include <linux/pci.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/spinlock.h> <snip>
Thanks! Tested the device tree clock portions on Intel SOCFPGA Stratix10 DevKit.
Tested-by: Thor Thayer <thor.thayer@xxxxxxxxxxxxxxx>
