linux.git/drivers/tty/serial/mpc52xx_uart.c, branch v4.3

serial: mpc52xx: let tx_empty callback return either 0 or TIOCSER_TEMT

2015-08-05T05:07:20+00:00

Documenation/serial/driver requests that the tx_empty callback should
return 0 if there are still chars in the fifo or shifter or TIOCSER_TEMT
(0x01) if no character is pending to be sent.

Fix the mpc52xx serial driver to not return MPC52xx_PSC_SR_TXEMP (i.e.
0x0800) but TIOCSER_TEMT as documented.

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman

drivers/tty/serial/mpc52xx_uart.c: fix typo in C comment

2015-05-06T20:26:59+00:00

Fix reference on PPC_MPC52xx in C comment after #endif.

Signed-off-by: Valentin Rothberg 
Reviewed-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman

tty: constify of_device_id array

2015-03-26T21:49:10+00:00

of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)

Signed-off-by: Fabian Frederick 
Acked-by: Peter Korsgaard 
Acked-by: Timur Tabi 
Acked-by: Patrice Chotard 
Signed-off-by: Greg Kroah-Hartman

tty: serial: drop owner assignment from platform_drivers

2014-10-20T14:21:45+00:00

A platform_driver does not need to set an owner, it will be populated by the
driver core.

Signed-off-by: Wolfram Sang

serial: mpc52xx: Use default serial core x_char handler

2014-09-08T23:22:42+00:00

mpc52xx_uart_send_xchar() is _identical_ to the default serial core
x_char handling behavior in uart_send_xchar().

Remove mpc52xx_uart_send_xchar().

Signed-off-by: Peter Hurley 
Signed-off-by: Greg Kroah-Hartman

serial: mpc512x: setup the PSC FIFO clock as well

2014-01-12T17:53:05+00:00

prepare and enable the FIFO clock upon PSC FIFO initialization,
check for and propagage errors when enabling the PSC FIFO clock,
disable and unprepare the FIFO clock upon PSC FIFO uninitialization

devm_{get,put}_clk() doesn't apply here, as the SoC provides a
single FIFO component which is shared among several PSC components,
thus the FIFO isn't associated with a device (while the PSCs are)

provide a fallback clock lookup approach in case the OF based clock
lookup for the PSC FIFO fails, this allows for successful operation in
the presence of an outdated device tree which lacks clock specs

Cc: Greg Kroah-Hartman 
Cc: Jiri Slaby 
Cc: linux-serial@vger.kernel.org
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Gerhard Sittig 
Signed-off-by: Anatolij Gustschin

serial: mpc512x: adjust for OF based clock lookup

2014-01-12T17:53:04+00:00

after device tree based clock lookup became available, the peripheral
driver need no longer construct clock names which include the PSC index,
remove the "psc%d_mclk" template and unconditionally use 'mclk'

acquire and release the "ipg" clock item for register access as well

Cc: Greg Kroah-Hartman 
Cc: Jiri Slaby 
Cc: linux-serial@vger.kernel.org
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Gerhard Sittig 
Signed-off-by: Anatolij Gustschin

serial: mpc52xx: remove reference to .set_wake()

2013-10-16T20:16:19+00:00

This callback is gone and not coming back, so will not be
supported later.

Cc: Gerhard Sittig 
Cc: Anatolij Gustschin 
Signed-off-by: Linus Walleij 
Signed-off-by: Greg Kroah-Hartman

serial: mpc512x: Remove casting the return value which is a void pointer

2013-09-26T21:29:59+00:00

Casting the return value which is a void pointer is redundant.
The conversion from void pointer to any other pointer type is
guaranteed by the C programming language.

Signed-off-by: Jingoo Han 
Acked-by: Vineet Gupta 
Signed-off-by: Greg Kroah-Hartman

serial: mpc512x: cleanup clock API use

2013-08-21T19:37:38+00:00

cleanup the clock API use of the UART driver which is shared among the
MPC512x and the MPC5200 platforms
- get, prepare, and enable the MCLK during port allocation; disable,
  unprepare and put the MCLK upon port release; hold a reference to the
  clock over the period of use; check for and propagate enable errors
- fix a buffer overflow for clock names with two digit PSC index numbers
- stick with the PPC_CLOCK 'psc%d_mclk' name for clock lookup, only
  switch to a fixed string later after device tree based clock lookup
  will have become available

to achieve support for MPC512x which is neutral to MPC5200, the
modification was done as follows
- introduce "clock alloc" and "clock release" routines in addition to
  the previous "clock enable/disable" routine in the psc_ops struct
- make the clock allocation a part of the port request (resource
  allocation), and make clock release a part of the port release, such
  that essential resources get allocated early
- just enable/disable the clock from within the .clock() callback
  without any allocation or preparation as the former implementation
  did, since this routine is called from within the startup and shutdown
  callbacks
- all of the above remains a NOP for the MPC5200 platform (no callbacks
  are provided on that platform)
- implementation note: the clock gets enabled upon allocation already
  just in case the clock is not only required for bitrate generation but
  for register access as well

Signed-off-by: Gerhard Sittig 
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Anatolij Gustschin