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spi: spi-apple: Implement Runtime PM support #530

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spi: spi-apple: Implement Runtime PM support #530

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30 changes: 30 additions & 0 deletions drivers/spi/spi-apple.c
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Original file line number Diff line number Diff line change
Expand Up @@ -464,6 +464,8 @@ static int apple_spi_probe(struct platform_device *pdev)
if (!ctlr)
return -ENOMEM;

platform_set_drvdata(pdev, ctlr);

spi = spi_controller_get_devdata(ctlr);
init_completion(&spi->done);

Expand Down Expand Up @@ -495,7 +497,10 @@ static int apple_spi_probe(struct platform_device *pdev)
ctlr->use_gpio_descriptors = true;
ctlr->auto_runtime_pm = true;

pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_get_noresume(&pdev->dev);
ret = devm_pm_runtime_enable(&pdev->dev);
if (ret < 0)
return ret;
Expand All @@ -506,9 +511,33 @@ static int apple_spi_probe(struct platform_device *pdev)
if (ret < 0)
return dev_err_probe(&pdev->dev, ret, "devm_spi_register_controller failed\n");

pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);

return 0;
}

static int __maybe_unused apple_spi_runtime_suspend(struct device *dev)
{
struct spi_controller *ctlr = dev_get_drvdata(dev);
struct apple_spi *spi = spi_controller_get_devdata(ctlr);

clk_disable_unprepare(spi->clk);
return 0;
}

static int __maybe_unused apple_spi_runtime_resume(struct device *dev)
{
struct spi_controller *ctlr = dev_get_drvdata(dev);
struct apple_spi *spi = spi_controller_get_devdata(ctlr);

return clk_prepare_enable(spi->clk);
}

static const struct dev_pm_ops apple_spi_pm_ops = {
SET_RUNTIME_PM_OPS(apple_spi_runtime_suspend, apple_spi_runtime_resume, NULL)
};

static const struct of_device_id apple_spi_of_match[] = {
{ .compatible = "apple,t8103-spi", },
{ .compatible = "apple,spi", },
Expand All @@ -520,6 +549,7 @@ static struct platform_driver apple_spi_driver = {
.probe = apple_spi_probe,
.driver = {
.name = "apple-spi",
.pm = pm_ptr(&apple_spi_pm_ops),
.of_match_table = apple_spi_of_match,
},
};
Expand Down