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serial-uartlite: Add runtime support

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Add runtime support

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shubhrajyoti Datta 2018-10-16 15:48:03 +05:30 committed by Greg Kroah-Hartman
parent 3b209d253e
commit 0379b1163e
1 changed files with 43 additions and 9 deletions
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52
drivers/tty/serial/uartlite.c
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@ -22,6 +22,7 @@
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#define ULITE_NAME "ttyUL"
#define ULITE_MAJOR 204
@ -54,6 +55,7 @@
#define ULITE_CONTROL_RST_TX 0x01
#define ULITE_CONTROL_RST_RX 0x02
#define ULITE_CONTROL_IE 0x10
#define UART_AUTOSUSPEND_TIMEOUT 3000
/* Static pointer to console port */
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
@ -391,12 +393,12 @@ static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
static void ulite_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
struct uartlite_data *pdata = port->private_data;
if (!state)
clk_enable(pdata->clk);
else
clk_disable(pdata->clk);
if (!state) {
pm_runtime_get_sync(port->dev);
} else {
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
}
}
#ifdef CONFIG_CONSOLE_POLL
@ -738,11 +740,32 @@ static int __maybe_unused ulite_resume(struct device *dev)
return 0;
}
static int __maybe_unused ulite_runtime_suspend(struct device *dev)
{
struct uart_port *port = dev_get_drvdata(dev);
struct uartlite_data *pdata = port->private_data;
clk_disable(pdata->clk);
return 0;
};
static int __maybe_unused ulite_runtime_resume(struct device *dev)
{
struct uart_port *port = dev_get_drvdata(dev);
struct uartlite_data *pdata = port->private_data;
clk_enable(pdata->clk);
return 0;
}
/* ---------------------------------------------------------------------
* Platform bus binding
*/
static SIMPLE_DEV_PM_OPS(ulite_pm_ops, ulite_suspend, ulite_resume);
static const struct dev_pm_ops ulite_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ulite_suspend, ulite_resume)
SET_RUNTIME_PM_OPS(ulite_runtime_suspend,
ulite_runtime_resume, NULL)
};
#if defined(CONFIG_OF)
/* Match table for of_platform binding */
@ -815,9 +838,15 @@ static int ulite_probe(struct platform_device *pdev)
return ret;
}
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = ulite_assign(&pdev->dev, id, res->start, irq, pdata);
clk_disable(pdata->clk);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
return ret;
}
@ -826,9 +855,14 @@ static int ulite_remove(struct platform_device *pdev)
{
struct uart_port *port = dev_get_drvdata(&pdev->dev);
struct uartlite_data *pdata = port->private_data;
int rc;
clk_disable_unprepare(pdata->clk);
return ulite_release(&pdev->dev);
rc = ulite_release(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
return rc;
}
/* work with hotplug and coldplug */