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spi: at91-usart: add power management support 

This patch implements power management callback function for USART as
SPI driver.

Signed-off-by: Radu Pirea <radu_nicolae.pirea@upb.ro>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Radu Pirea 2018-11-21 13:27:30 +02:00 committed by Mark Brown
parent 1d2319efb6
commit 96ed3ecde2
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GPG Key ID: 24D68B725D5487D0
1 changed files with 61 additions and 0 deletions
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61
drivers/spi/spi-at91-usart.c
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@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
@ -399,6 +400,59 @@ static int at91_usart_spi_probe(struct platform_device *pdev)
return ret;
}
__maybe_unused static int at91_usart_spi_runtime_suspend(struct device *dev)
{
struct spi_controller *ctlr = dev_get_drvdata(dev);
struct at91_usart_spi *aus = spi_master_get_devdata(ctlr);
clk_disable_unprepare(aus->clk);
pinctrl_pm_select_sleep_state(dev);
return 0;
}
__maybe_unused static int at91_usart_spi_runtime_resume(struct device *dev)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
struct at91_usart_spi *aus = spi_master_get_devdata(ctrl);
pinctrl_pm_select_default_state(dev);
return clk_prepare_enable(aus->clk);
}
__maybe_unused static int at91_usart_spi_suspend(struct device *dev)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
int ret;
ret = spi_controller_suspend(ctrl);
if (ret)
return ret;
if (!pm_runtime_suspended(dev))
at91_usart_spi_runtime_suspend(dev);
return 0;
}
__maybe_unused static int at91_usart_spi_resume(struct device *dev)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
struct at91_usart_spi *aus = spi_master_get_devdata(ctrl);
int ret;
if (!pm_runtime_suspended(dev)) {
ret = at91_usart_spi_runtime_resume(dev);
if (ret)
return ret;
}
at91_usart_spi_init(aus);
return spi_controller_resume(ctrl);
}
static int at91_usart_spi_remove(struct platform_device *pdev)
{
struct spi_controller *ctlr = platform_get_drvdata(pdev);
@ -409,6 +463,12 @@ static int at91_usart_spi_remove(struct platform_device *pdev)
return 0;
}
static const struct dev_pm_ops at91_usart_spi_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(at91_usart_spi_suspend, at91_usart_spi_resume)
SET_RUNTIME_PM_OPS(at91_usart_spi_runtime_suspend,
at91_usart_spi_runtime_resume, NULL)
};
static const struct of_device_id at91_usart_spi_dt_ids[] = {
{ .compatible = "microchip,at91sam9g45-usart-spi"},
{ /* sentinel */}
@ -419,6 +479,7 @@ MODULE_DEVICE_TABLE(of, at91_usart_spi_dt_ids);
static struct platform_driver at91_usart_spi_driver = {
.driver = {
.name = "at91_usart_spi",
.pm = &at91_usart_spi_pm_ops,
},
.probe = at91_usart_spi_probe,
.remove = at91_usart_spi_remove,