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Commit 5c678694 authored by Russell King's avatar Russell King Committed by Mark Brown
Browse files

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: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent c85012ad

drivers/spi/spi-orion.c

+50 −9
Original line number Diff line number Diff line
@@ -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 @@ orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer) 
	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 @@ static int orion_spi_probe(struct platform_device *pdev) 


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,