perf/smmuv3: Add devicetree support

Add device-tree support to the SMMUv3 PMCG driver.
Signed-off-by: Jay Chen <jkchen@linux.alibaba.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20211117144844.241072-3-jean-philippe@linaro.orgSigned-off-by: Will Deacon <will@kernel.org>

drivers/perf/arm_smmuv3_pmu.c

@@ -47,6 +47,7 @@
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/msi.h>
+#include <linux/of.h>
 #include <linux/perf_event.h>
 #include <linux/platform_device.h>
 #include <linux/smp.h>
@@ -834,7 +835,8 @@ static int smmu_pmu_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	smmu_pmu_get_acpi_options(smmu_pmu);
+	if (!dev->of_node)
+		smmu_pmu_get_acpi_options(smmu_pmu);
 
 	/* Pick one CPU to be the preferred one to use */
 	smmu_pmu->on_cpu = raw_smp_processor_id();
@@ -884,9 +886,16 @@ static void smmu_pmu_shutdown(struct platform_device *pdev)
 	smmu_pmu_disable(&smmu_pmu->pmu);
 }
 
+static const struct of_device_id smmu_pmu_of_match[] = {
+	{ .compatible = "arm,smmu-v3-pmcg" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, smmu_pmu_of_match);
+
 static struct platform_driver smmu_pmu_driver = {
 	.driver = {
 		.name = "arm-smmu-v3-pmcg",
+		.of_match_table = of_match_ptr(smmu_pmu_of_match),
 		.suppress_bind_attrs = true,
 	},
 	.probe = smmu_pmu_probe,