diff options
| author | Tony Lindgren <tony@atomide.com> | 2023-05-25 14:30:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-31 10:46:59 +0100 |
| commit | 84a9582fd203063cd4d301204971ff2cd8327f1a (patch) | |
| tree | d636cedba8d6f7f7f1c8cf1cce34e0be6139a78d /include/linux/serial_core.h | |
| parent | ae62c49c0ceff20dc7c1fad4a5b8f91d64b4f628 (diff) | |
serial: core: Start managing serial controllers to enable runtime PM
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>
Diffstat (limited to 'include/linux/serial_core.h')
| -rw-r--r-- | include/linux/serial_core.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index ddcdb5b8523e..6d58c57acdaa 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -28,6 +28,7 @@ struct uart_port; struct serial_struct; +struct serial_port_device; struct device; struct gpio_desc; @@ -458,6 +459,7 @@ struct uart_port { struct serial_rs485 *rs485); int (*iso7816_config)(struct uart_port *, struct serial_iso7816 *iso7816); + int ctrl_id; /* optional serial core controller id */ unsigned int irq; /* irq number */ unsigned long irqflags; /* irq flags */ unsigned int uartclk; /* base uart clock */ @@ -563,7 +565,8 @@ struct uart_port { unsigned int minor; resource_size_t mapbase; /* for ioremap */ resource_size_t mapsize; - struct device *dev; /* parent device */ + struct device *dev; /* serial port physical parent device */ + struct serial_port_device *port_dev; /* serial core port device */ unsigned long sysrq; /* sysrq timeout */ unsigned int sysrq_ch; /* char for sysrq */ |