soc: samsung: pmu: Populate children syscon nodes

The syscon poweroff and restart nodes logically belong to the Power
Management Unit so populate possible children.

This also requires providing compatibles for Exynos5410 and Exynos7 so
the PMU device and its children will be instantiated for them as well.
Just like Exynos5433, these chipsets are not yet supported by the PMU
driver.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>

Documentation/devicetree/bindings/arm/samsung/pmu.txt

@@ -43,6 +43,12 @@ following properties:
 - interrupt-parent: a phandle indicating which interrupt controller
   this PMU signals interrupts to.
 
+
+Optional nodes:
+
+- nodes defining the restart and poweroff syscon children
+
+
 Example :
 pmu_system_controller: system-controller@10040000 {
 	compatible = "samsung,exynos5250-pmu", "syscon";

drivers/soc/samsung/exynos-pmu.c

@@ -84,11 +84,15 @@ static const struct of_device_id exynos_pmu_of_device_ids[] = {
 	}, {
 		.compatible = "samsung,exynos5250-pmu",
 		.data = exynos_pmu_data_arm_ptr(exynos5250_pmu_data),
+	}, {
+		.compatible = "samsung,exynos5410-pmu",
 	}, {
 		.compatible = "samsung,exynos5420-pmu",
 		.data = exynos_pmu_data_arm_ptr(exynos5420_pmu_data),
 	}, {
 		.compatible = "samsung,exynos5433-pmu",
+	}, {
+		.compatible = "samsung,exynos7-pmu",
 	},
 	{ /*sentinel*/ },
 };
@@ -126,6 +130,9 @@ static int exynos_pmu_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, pmu_context);
 
+	if (devm_of_platform_populate(dev))
+		dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");
+
 	dev_dbg(dev, "Exynos PMU Driver probe done\n");
 	return 0;
 }