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sh: MTU2: Basic runtime PM support
Modify the SH MTU2 clock event device driver to support runtime PM at a basic level (i.e. device clocks can be disabled and enabled, but domain power must be on, because the device has to be marked as "irq safe"). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Magnus Damm <damm@opensource.se>
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@ -32,6 +32,7 @@
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_runtime.h>
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struct sh_mtu2_priv {
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void __iomem *mapbase;
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@ -123,6 +124,9 @@ static int sh_mtu2_enable(struct sh_mtu2_priv *p)
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{
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int ret;
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pm_runtime_get_sync(&p->pdev->dev);
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dev_pm_syscore_device(&p->pdev->dev, true);
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/* enable clock */
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ret = clk_enable(p->clk);
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if (ret) {
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@ -157,6 +161,9 @@ static void sh_mtu2_disable(struct sh_mtu2_priv *p)
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/* stop clock */
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clk_disable(p->clk);
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dev_pm_syscore_device(&p->pdev->dev, false);
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pm_runtime_put(&p->pdev->dev);
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}
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static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id)
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@ -317,18 +324,17 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev)
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static int __devinit sh_mtu2_probe(struct platform_device *pdev)
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{
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struct sh_mtu2_priv *p = platform_get_drvdata(pdev);
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struct sh_timer_config *cfg = pdev->dev.platform_data;
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int ret;
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if (!is_early_platform_device(pdev)) {
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struct sh_timer_config *cfg = pdev->dev.platform_data;
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if (cfg->clockevent_rating)
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dev_pm_syscore_device(&pdev->dev, true);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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}
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if (p) {
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dev_info(&pdev->dev, "kept as earlytimer\n");
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return 0;
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goto out;
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}
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p = kmalloc(sizeof(*p), GFP_KERNEL);
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@ -341,8 +347,19 @@ static int __devinit sh_mtu2_probe(struct platform_device *pdev)
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if (ret) {
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kfree(p);
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platform_set_drvdata(pdev, NULL);
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pm_runtime_idle(&pdev->dev);
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return ret;
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}
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return ret;
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if (is_early_platform_device(pdev))
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return 0;
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out:
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if (cfg->clockevent_rating)
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pm_runtime_irq_safe(&pdev->dev);
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else
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pm_runtime_idle(&pdev->dev);
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return 0;
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}
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static int __devexit sh_mtu2_remove(struct platform_device *pdev)
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