serial-uartlite: Add runtime support (0379b116) · Commits · 戴 / test

drivers/tty/serial/uartlite.c

+43 −9

Original line number	Diff line number	Diff line
		@@ -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 */

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