blackbird-obmc-linux/drivers/tty/serdev, branch dev-5.0-raptor-04-16-2019

serdev: document the write functions using kernel-doc

2018-11-27T18:44:21+00:00

Document the asynchronous serdev_device_write_buf() and synchronous serdev_device_write() functions using kernel-doc. Specifically, mention that writing data only means that data has been buffered by the controller, and that the synchronous helper depends on serdev_device_write_wakeup() being called in the driver write_wakeup() callback. Signed-off-by: Johan Hovold Reviewed-by: Rob Herring Signed-off-by: Greg Kroah-Hartman

serdev: make synchronous write helper interruptible

2018-11-27T18:44:21+00:00

Allow the synchronous serdev_device_write() helper to be interrupted. This is useful for cases where I/O is performed on behalf of user space and we don't want to block indefinitely when using flow control. Signed-off-by: Johan Hovold Reviewed-by: Rob Herring Signed-off-by: Greg Kroah-Hartman

serdev: make synchronous write return bytes written

2018-11-27T18:44:21+00:00

Make the synchronous serdev_device_write() helper behave analogous to the asynchronous serdev_device_write_buf() by returning the number of bytes written (or rather buffered) also on timeout. This will allow drivers to distinguish the case where data was partially written from the case where no data was written. Also update the only two users that checked the return value. Signed-off-by: Johan Hovold Reviewed-by: Rob Herring Signed-off-by: Greg Kroah-Hartman

serdev: use zero to indicate infinite write timeout

2018-11-27T18:44:21+00:00

Use zero to indicate infinite timeout for the synchronous serdev_device_write() helper. This allows drivers to specify an infinite timeout without knowing about serdev implementation details, while also allowing the same timeout argument to be used for both serdev_device_write() and serdev_device_wait_until_sent(). Note that passing zero to the current helper makes no sense; just call the asynchronous serdev_device_write_buf() directly instead. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman

serdev: add dev_pm_domain_attach|detach()

2018-07-15T10:23:53+00:00

In order to open up the required power gate before any operation can be effectively performed over the serial bus between CPU and serdev, it's clearly essential to add common attach functions for PM domains to serdev at the probe phase. Similarly, the relevant dettach function for the PM domains should be properly and reversely added at the remove phase. Signed-off-by: Sean Wang Reviewed-by: Ulf Hansson Reviewed-by: Johan Hovold Cc: Rob Herring Cc: Ulf Hansson Cc: Jiri Slaby Cc: linux-serial@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

Merge 4.18-rc3 into tty-next

2018-07-02T06:23:43+00:00

We want ths tty core changes in here as well. Signed-off-by: Greg Kroah-Hartman

serdev: fix memleak on module unload

2018-06-28T12:34:39+00:00

Make sure to free all resources associated with the ida on module exit. Fixes: cd6484e1830b ("serdev: Introduce new bus for serial attached devices") Cc: stable # 4.11 Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman

serdev: add controller runtime PM support

2018-06-28T12:07:54+00:00

Add support for controller runtime power management to serdev core. This is needed to allow slave drivers to manage the runtime PM state of the underlying serial controller when its driver, in turn, implements more aggressive runtime power management (e.g. using autosuspend). For some applications, for example, where loss off initial data after a remote-wakeup event is acceptable or where rx is not used at all, aggressive serial controller runtime PM may be used without further involvement of the slave driver. But when this is not the case, the slave driver must be able to indicate when incoming data is expected in order to avoid data loss. To facilitate the common case, where the serial controller power state is active whenever the port is open (which is the case with just about every serial driver), and where data loss is not acceptable and cannot even be prevented by explicit controller runtime power management, an RPM reference is taken in serdev open and put again at close. This reference can later be balanced by any serdev driver which wants and/or can handle aggressive controller runtime PM. Note that the .ignore_children flag is set for the serdev controller to allow the underlying hardware to idle when no I/O is expected, regardless of the slave device RPM state. Acked-by: Tony Lindgren Reviewed-by: Sebastian Reichel Signed-off-by: Johan Hovold Acked-by: Rob Herring Signed-off-by: Greg Kroah-Hartman

serdev: Fix typo in serdev_device_alloc

2018-03-14T14:02:45+00:00

Fix function name in serdev_device_alloc() definition Signed-off-by: Frédéric Danis Signed-off-by: Greg Kroah-Hartman

Merge tag 'tty-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

2018-02-01T17:46:00+00:00

Pull tty/staging driver updates from Greg KH: "Here is the big tty/serial driver update for 4.16-rc1. The usual number of various serial driver fixes and updates to try to get them to work with crazy hardware configurations (seriously, how many different ways are hardware engineers going to come up with to hook up a simple UART?) There is also some serdev bugfixes and updates, as well as a smattering of other small fixes in here. All have been in the linux-next tree for a while, with no reported issues" * tag 'tty-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (65 commits) tty: serial: exar: Relocate sleep wake-up handling tty: fix data race between tty_init_dev and flush of buf serial: imx: fix endless loop during suspend serial: core: mark port as initialized after successful IRQ change serdev: only match serdev devices serdev: do not generate modaliases for controllers serial: mxs-auart: don't use GPIOF_* with gpiod_get_direction serial: 8250_dw: Revert "Improve clock rate setting" MAINTAINERS: Add myself as designated reviewer for 8250_dw gpio: serial: max310x: Support open-drain configuration for GPIOs serdev: Fix serdev_uevent failure on ACPI enumerated serdev-controllers serial: 8250_ingenic: Parse earlycon options serial: 8250_ingenic: Add support for the JZ4770 SoC serial: core: Make uart_parse_options take const char* argument serial: 8250_of: fix return code when probe function fails to get reset serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS serial: 8250_uniphier: fix error return code in uniphier_uart_probe() tty: n_gsm: Allow ADM response in addition to UA for control dlci tty: omap-serial: Fix initial on-boot RTS GPIO level tty: serial: jsm: Add one check against NULL pointer dereference ...