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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-06-21 12:22:37 +0100
committerMark Brown <broonie@linaro.org>2014-06-21 16:31:40 +0100
commit5c6786945b4e0434312572da6cf40f13f1763740 (patch)
tree1e6cbd61aa6417cb96e73adcd73fb60fb3bc2fcb /drivers/spi
parentc85012addd800d8fd135b9a871d5ce9b8e8c4081 (diff)
downloadop-kernel-dev-5c6786945b4e0434312572da6cf40f13f1763740.zip
op-kernel-dev-5c6786945b4e0434312572da6cf40f13f1763740.tar.gz
spi: spi-orion: add runtime PM support
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-orion.c59
1 files changed, 50 insertions, 9 deletions
diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
index 2484498..aa3ecfc 100644
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@ -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,
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