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path: root/drivers/clk/samsung/clk-exynos-clkout.c
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Diffstat (limited to 'drivers/clk/samsung/clk-exynos-clkout.c')
-rw-r--r--drivers/clk/samsung/clk-exynos-clkout.c199
1 files changed, 142 insertions, 57 deletions
diff --git a/drivers/clk/samsung/clk-exynos-clkout.c b/drivers/clk/samsung/clk-exynos-clkout.c
index 34ccb1d23bc3..e6d6cbf8c4e6 100644
--- a/drivers/clk/samsung/clk-exynos-clkout.c
+++ b/drivers/clk/samsung/clk-exynos-clkout.c
@@ -9,10 +9,13 @@
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
+#include <linux/module.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
-#include <linux/syscore_ops.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
#define EXYNOS_CLKOUT_NR_CLKS 1
#define EXYNOS_CLKOUT_PARENTS 32
@@ -28,41 +31,103 @@ struct exynos_clkout {
struct clk_mux mux;
spinlock_t slock;
void __iomem *reg;
+ struct device_node *np;
u32 pmu_debug_save;
struct clk_hw_onecell_data data;
};
-static struct exynos_clkout *clkout;
+struct exynos_clkout_variant {
+ u32 mux_mask;
+};
-static int exynos_clkout_suspend(void)
-{
- clkout->pmu_debug_save = readl(clkout->reg + EXYNOS_PMU_DEBUG_REG);
+static const struct exynos_clkout_variant exynos_clkout_exynos4 = {
+ .mux_mask = EXYNOS4_CLKOUT_MUX_MASK,
+};
- return 0;
-}
+static const struct exynos_clkout_variant exynos_clkout_exynos5 = {
+ .mux_mask = EXYNOS5_CLKOUT_MUX_MASK,
+};
-static void exynos_clkout_resume(void)
+static const struct of_device_id exynos_clkout_ids[] = {
+ {
+ .compatible = "samsung,exynos3250-pmu",
+ .data = &exynos_clkout_exynos4,
+ }, {
+ .compatible = "samsung,exynos4210-pmu",
+ .data = &exynos_clkout_exynos4,
+ }, {
+ .compatible = "samsung,exynos4412-pmu",
+ .data = &exynos_clkout_exynos4,
+ }, {
+ .compatible = "samsung,exynos5250-pmu",
+ .data = &exynos_clkout_exynos5,
+ }, {
+ .compatible = "samsung,exynos5410-pmu",
+ .data = &exynos_clkout_exynos5,
+ }, {
+ .compatible = "samsung,exynos5420-pmu",
+ .data = &exynos_clkout_exynos5,
+ }, {
+ .compatible = "samsung,exynos5433-pmu",
+ .data = &exynos_clkout_exynos5,
+ }, { }
+};
+MODULE_DEVICE_TABLE(of, exynos_clkout_ids);
+
+/*
+ * Device will be instantiated as child of PMU device without its own
+ * device node. Therefore match compatibles against parent.
+ */
+static int exynos_clkout_match_parent_dev(struct device *dev, u32 *mux_mask)
{
- writel(clkout->pmu_debug_save, clkout->reg + EXYNOS_PMU_DEBUG_REG);
-}
+ const struct exynos_clkout_variant *variant;
+ const struct of_device_id *match;
-static struct syscore_ops exynos_clkout_syscore_ops = {
- .suspend = exynos_clkout_suspend,
- .resume = exynos_clkout_resume,
-};
+ if (!dev->parent) {
+ dev_err(dev, "not instantiated from MFD\n");
+ return -EINVAL;
+ }
+
+ match = of_match_device(exynos_clkout_ids, dev->parent);
+ if (!match) {
+ dev_err(dev, "cannot match parent device\n");
+ return -EINVAL;
+ }
+ variant = match->data;
-static void __init exynos_clkout_init(struct device_node *node, u32 mux_mask)
+ *mux_mask = variant->mux_mask;
+
+ return 0;
+}
+
+static int exynos_clkout_probe(struct platform_device *pdev)
{
const char *parent_names[EXYNOS_CLKOUT_PARENTS];
struct clk *parents[EXYNOS_CLKOUT_PARENTS];
- int parent_count;
- int ret;
- int i;
+ struct exynos_clkout *clkout;
+ int parent_count, ret, i;
+ u32 mux_mask;
- clkout = kzalloc(struct_size(clkout, data.hws, EXYNOS_CLKOUT_NR_CLKS),
- GFP_KERNEL);
+ clkout = devm_kzalloc(&pdev->dev,
+ struct_size(clkout, data.hws, EXYNOS_CLKOUT_NR_CLKS),
+ GFP_KERNEL);
if (!clkout)
- return;
+ return -ENOMEM;
+
+ ret = exynos_clkout_match_parent_dev(&pdev->dev, &mux_mask);
+ if (ret)
+ return ret;
+
+ clkout->np = pdev->dev.of_node;
+ if (!clkout->np) {
+ /*
+ * pdev->dev.parent was checked by exynos_clkout_match_parent_dev()
+ * so it is not NULL.
+ */
+ clkout->np = pdev->dev.parent->of_node;
+ }
+
+ platform_set_drvdata(pdev, clkout);
spin_lock_init(&clkout->slock);
@@ -71,7 +136,7 @@ static void __init exynos_clkout_init(struct device_node *node, u32 mux_mask)
char name[] = "clkoutXX";
snprintf(name, sizeof(name), "clkout%d", i);
- parents[i] = of_clk_get_by_name(node, name);
+ parents[i] = of_clk_get_by_name(clkout->np, name);
if (IS_ERR(parents[i])) {
parent_names[i] = "none";
continue;
@@ -82,11 +147,13 @@ static void __init exynos_clkout_init(struct device_node *node, u32 mux_mask)
}
if (!parent_count)
- goto free_clkout;
+ return -EINVAL;
- clkout->reg = of_iomap(node, 0);
- if (!clkout->reg)
+ clkout->reg = of_iomap(clkout->np, 0);
+ if (!clkout->reg) {
+ ret = -ENODEV;
goto clks_put;
+ }
clkout->gate.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG;
clkout->gate.bit_idx = EXYNOS_CLKOUT_DISABLE_SHIFT;
@@ -103,17 +170,17 @@ static void __init exynos_clkout_init(struct device_node *node, u32 mux_mask)
&clk_mux_ops, NULL, NULL, &clkout->gate.hw,
&clk_gate_ops, CLK_SET_RATE_PARENT
| CLK_SET_RATE_NO_REPARENT);
- if (IS_ERR(clkout->data.hws[0]))
+ if (IS_ERR(clkout->data.hws[0])) {
+ ret = PTR_ERR(clkout->data.hws[0]);
goto err_unmap;
+ }
clkout->data.num = EXYNOS_CLKOUT_NR_CLKS;
- ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, &clkout->data);
+ ret = of_clk_add_hw_provider(clkout->np, of_clk_hw_onecell_get, &clkout->data);
if (ret)
goto err_clk_unreg;
- register_syscore_ops(&exynos_clkout_syscore_ops);
-
- return;
+ return 0;
err_clk_unreg:
clk_hw_unregister(clkout->data.hws[0]);
@@ -123,38 +190,56 @@ clks_put:
for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i)
if (!IS_ERR(parents[i]))
clk_put(parents[i]);
-free_clkout:
- kfree(clkout);
- pr_err("%s: failed to register clkout clock\n", __func__);
+ dev_err(&pdev->dev, "failed to register clkout clock\n");
+
+ return ret;
}
-/*
- * We use CLK_OF_DECLARE_DRIVER initialization method to avoid setting
- * the OF_POPULATED flag on the pmu device tree node, so later the
- * Exynos PMU platform device can be properly probed with PMU driver.
- */
+static int exynos_clkout_remove(struct platform_device *pdev)
+{
+ struct exynos_clkout *clkout = platform_get_drvdata(pdev);
+
+ of_clk_del_provider(clkout->np);
+ clk_hw_unregister(clkout->data.hws[0]);
+ iounmap(clkout->reg);
+
+ return 0;
+}
-static void __init exynos4_clkout_init(struct device_node *node)
+static int __maybe_unused exynos_clkout_suspend(struct device *dev)
{
- exynos_clkout_init(node, EXYNOS4_CLKOUT_MUX_MASK);
+ struct exynos_clkout *clkout = dev_get_drvdata(dev);
+
+ clkout->pmu_debug_save = readl(clkout->reg + EXYNOS_PMU_DEBUG_REG);
+
+ return 0;
}
-CLK_OF_DECLARE_DRIVER(exynos4210_clkout, "samsung,exynos4210-pmu",
- exynos4_clkout_init);
-CLK_OF_DECLARE_DRIVER(exynos4412_clkout, "samsung,exynos4412-pmu",
- exynos4_clkout_init);
-CLK_OF_DECLARE_DRIVER(exynos3250_clkout, "samsung,exynos3250-pmu",
- exynos4_clkout_init);
-
-static void __init exynos5_clkout_init(struct device_node *node)
+
+static int __maybe_unused exynos_clkout_resume(struct device *dev)
{
- exynos_clkout_init(node, EXYNOS5_CLKOUT_MUX_MASK);
+ struct exynos_clkout *clkout = dev_get_drvdata(dev);
+
+ writel(clkout->pmu_debug_save, clkout->reg + EXYNOS_PMU_DEBUG_REG);
+
+ return 0;
}
-CLK_OF_DECLARE_DRIVER(exynos5250_clkout, "samsung,exynos5250-pmu",
- exynos5_clkout_init);
-CLK_OF_DECLARE_DRIVER(exynos5410_clkout, "samsung,exynos5410-pmu",
- exynos5_clkout_init);
-CLK_OF_DECLARE_DRIVER(exynos5420_clkout, "samsung,exynos5420-pmu",
- exynos5_clkout_init);
-CLK_OF_DECLARE_DRIVER(exynos5433_clkout, "samsung,exynos5433-pmu",
- exynos5_clkout_init);
+
+static SIMPLE_DEV_PM_OPS(exynos_clkout_pm_ops, exynos_clkout_suspend,
+ exynos_clkout_resume);
+
+static struct platform_driver exynos_clkout_driver = {
+ .driver = {
+ .name = "exynos-clkout",
+ .of_match_table = exynos_clkout_ids,
+ .pm = &exynos_clkout_pm_ops,
+ },
+ .probe = exynos_clkout_probe,
+ .remove = exynos_clkout_remove,
+};
+module_platform_driver(exynos_clkout_driver);
+
+MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
+MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");
+MODULE_DESCRIPTION("Samsung Exynos clock output driver");
+MODULE_LICENSE("GPL");