84a9582fd2
We want to enable runtime PM for serial port device drivers in a generic way. To do this, we want to have the serial core layer manage the registered physical serial controller devices. To manage serial controllers, let's set up a struct bus and struct device for the serial core controller as suggested by Greg and Jiri. The serial core controller devices are children of the physical serial port device. The serial core controller device is needed to support multiple different kind of ports connected to single physical serial port device. Let's also set up a struct device for the serial core port. The serial core port instances are children of the serial core controller device. With the serial core port device we can now flush pending TX on the runtime PM resume as suggested by Johan. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Suggested-by: Jiri Slaby <jirislaby@kernel.org> Suggested-by: Johan Hovold <johan@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20230525113034.46880-1-tony@atomide.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Serial core related functions, serial port device drivers do not need this.
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*
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* Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/
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* Author: Tony Lindgren <tony@atomide.com>
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*/
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#define to_serial_base_ctrl_device(d) container_of((d), struct serial_ctrl_device, dev)
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#define to_serial_base_port_device(d) container_of((d), struct serial_port_device, dev)
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struct uart_driver;
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struct uart_port;
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struct device_driver;
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struct device;
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struct serial_ctrl_device {
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struct device dev;
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};
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struct serial_port_device {
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struct device dev;
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struct uart_port *port;
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};
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int serial_base_ctrl_init(void);
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void serial_base_ctrl_exit(void);
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int serial_base_port_init(void);
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void serial_base_port_exit(void);
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int serial_base_driver_register(struct device_driver *driver);
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void serial_base_driver_unregister(struct device_driver *driver);
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struct serial_ctrl_device *serial_base_ctrl_add(struct uart_port *port,
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struct device *parent);
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struct serial_port_device *serial_base_port_add(struct uart_port *port,
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struct serial_ctrl_device *parent);
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void serial_base_ctrl_device_remove(struct serial_ctrl_device *ctrl_dev);
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void serial_base_port_device_remove(struct serial_port_device *port_dev);
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int serial_ctrl_register_port(struct uart_driver *drv, struct uart_port *port);
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void serial_ctrl_unregister_port(struct uart_driver *drv, struct uart_port *port);
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int serial_core_register_port(struct uart_driver *drv, struct uart_port *port);
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void serial_core_unregister_port(struct uart_driver *drv, struct uart_port *port);
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