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spi: spi-orion: add runtime PM support

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Add trivial runtime PM support.  This will only be of benefit on SoCs
where the clock to the SPI interface can be shut down.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Russell King 2014-06-21 12:22:37 +01:00 committed by Mark Brown
parent c85012addd
commit 5c6786945b
1 changed files with 50 additions and 9 deletions
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59
drivers/spi/spi-orion.c
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@ -16,6 +16,7 @@
#include <linux/io.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/sizes.h>
@ -23,6 +24,9 @@
#define DRIVER_NAME "orion_spi"
/* Runtime PM autosuspend timeout: PM is fairly light on this driver */
#define SPI_AUTOSUSPEND_TIMEOUT 200
#define ORION_NUM_CHIPSELECTS 1 /* only one slave is supported*/
#define ORION_SPI_WAIT_RDY_MAX_LOOP 2000 /* in usec */
@ -277,7 +281,6 @@ out:
return xfer->len - count;
}
static int orion_spi_transfer_one_message(struct spi_master *master,
struct spi_message *m)
{
@ -370,6 +373,7 @@ static int orion_spi_probe(struct platform_device *pdev)
master->transfer_one_message = orion_spi_transfer_one_message;
master->num_chipselect = ORION_NUM_CHIPSELECTS;
master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
master->auto_runtime_pm = true;
platform_set_drvdata(pdev, master);
@ -397,16 +401,26 @@ static int orion_spi_probe(struct platform_device *pdev)
goto out_rel_clk;
}
pm_runtime_set_active(&pdev->dev);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
pm_runtime_enable(&pdev->dev);
if (orion_spi_reset(spi) < 0)
goto out_rel_clk;
goto out_rel_pm;
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
master->dev.of_node = pdev->dev.of_node;
status = devm_spi_register_master(&pdev->dev, master);
status = spi_register_master(master);
if (status < 0)
goto out_rel_clk;
goto out_rel_pm;
return status;
out_rel_pm:
pm_runtime_disable(&pdev->dev);
out_rel_clk:
clk_disable_unprepare(spi->clk);
out:
@ -417,19 +431,45 @@ out:
static int orion_spi_remove(struct platform_device *pdev)
{
struct spi_master *master;
struct orion_spi *spi;
master = platform_get_drvdata(pdev);
spi = spi_master_get_devdata(master);
struct spi_master *master = platform_get_drvdata(pdev);
struct orion_spi *spi = spi_master_get_devdata(master);
pm_runtime_get_sync(&pdev->dev);
clk_disable_unprepare(spi->clk);
spi_unregister_master(master);
pm_runtime_disable(&pdev->dev);
return 0;
}
MODULE_ALIAS("platform:" DRIVER_NAME);
#ifdef CONFIG_PM_RUNTIME
static int orion_spi_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct orion_spi *spi = spi_master_get_devdata(master);
clk_disable_unprepare(spi->clk);
return 0;
}
static int orion_spi_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct orion_spi *spi = spi_master_get_devdata(master);
return clk_prepare_enable(spi->clk);
}
#endif
static const struct dev_pm_ops orion_spi_pm_ops = {
SET_RUNTIME_PM_OPS(orion_spi_runtime_suspend,
orion_spi_runtime_resume,
NULL)
};
static const struct of_device_id orion_spi_of_match_table[] = {
{ .compatible = "marvell,orion-spi", },
{}
@ -440,6 +480,7 @@ static struct platform_driver orion_spi_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.pm = &orion_spi_pm_ops,
.of_match_table = of_match_ptr(orion_spi_of_match_table),
},
.probe = orion_spi_probe,