soc: samsung: exynos-pmu: instantiate clkout driver as MFD

The Exynos clock output (clkout) driver uses same register address space
(Power Management Unit address space) as Exynos PMU driver and same set
of compatibles.  It was modeled as clock provider instantiated with
CLK_OF_DECLARE_DRIVER().

This however brings ordering problems and lack of probe deferral,
therefore clkout driver should be converted to a regular module and
instantiated as a child of PMU driver to be able to use existing
compatibles and address space.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20201001165646.32279-2-krzk@kernel.org

diff --git a/drivers/soc/samsung/exynos-pmu.c b/drivers/soc/samsung/exynos-pmu.c
index 17304fa1842969e54921caceee3cbf7fbfc72b03..a18c93a4646c8db544c8e55d3de1f0cb2378ca06 100644 (file)
--- a/drivers/soc/samsung/exynos-pmu.c
+++ b/drivers/soc/samsung/exynos-pmu.c
@@ -8,6 +8,7 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/mfd/core.h>
 #include <linux/mfd/syscon.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
@@ -97,6 +98,10 @@ static const struct of_device_id exynos_pmu_of_device_ids[] = {
        { /*sentinel*/ },
 };
 
+static const struct mfd_cell exynos_pmu_devs[] = {
+       { .name = "exynos-clkout", },
+};
+
 struct regmap *exynos_get_pmu_regmap(void)
 {
        struct device_node *np = of_find_matching_node(NULL,
@@ -110,6 +115,7 @@ EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap);
 static int exynos_pmu_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
+       int ret;
 
        pmu_base_addr = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(pmu_base_addr))
@@ -128,6 +134,11 @@ static int exynos_pmu_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, pmu_context);
 
+       ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, exynos_pmu_devs,
+                                  ARRAY_SIZE(exynos_pmu_devs), NULL, 0, NULL);
+       if (ret)
+               return ret;
+
        if (devm_of_platform_populate(dev))
                dev_err(dev, "Error populating children, reboot and poweroff might not work properly\n");