Merge tag 'tty-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty / serial driver updates from Greg KH:
 "Here is the big set of serial and tty driver updates for 6.3-rc1.

  Once again, Jiri and Ilpo have done a number of core vt and tty/serial
  layer cleanups that were much needed and appreciated. Other than that,
  it's just a bunch of little tty/serial driver updates:

   - qcom-geni-serial driver updates

   - liteuart driver updates

   - hvcs driver cleanups

   - n_gsm updates and additions for new features

   - more 8250 device support added

   - fpga/dfl update and additions

   - imx serial driver updates

   - fsl_lpuart updates

   - other tiny fixes and updates for serial drivers

  All of these have been in linux-next for a while with no reported
  problems"

* tag 'tty-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (143 commits)
  tty: n_gsm: add keep alive support
  serial: imx: remove a redundant check
  dt-bindings: serial: snps-dw-apb-uart: add dma & dma-names properties
  soc: qcom: geni-se: Move qcom-geni-se.h to linux/soc/qcom/geni-se.h
  tty: n_gsm: add TIOCMIWAIT support
  tty: n_gsm: add RING/CD control support
  tty: n_gsm: mark unusable ioctl structure fields accordingly
  serial: imx: get rid of registers shadowing
  serial: imx: refine local variables in rxint()
  serial: imx: stop using USR2 in FIFO reading loop
  serial: imx: remove redundant USR2 read from FIFO reading loop
  serial: imx: do not break from FIFO reading loop prematurely
  serial: imx: do not sysrq broken chars
  serial: imx: work-around for hardware RX flood
  serial: imx: factor-out common code to imx_uart_soft_reset()
  serial: 8250_pci1xxxx: Add power management functions to quad-uart driver
  serial: 8250_pci1xxxx: Add RS485 support to quad-uart driver
  serial: 8250_pci1xxxx: Add driver for quad-uart support
  serial: 8250_pci: Add serial8250_pci_setup_port definition in 8250_pcilib.c
  tty: pcn_uart: fix memory leak with using debugfs_lookup()
  ...

1 files changed, 19 insertions, 0 deletions

diff --git a/Documentation/driver-api/tty/n_gsm.rst b/Documentation/driver-api/tty/n_gsm.rst
index 35d7381515b0..9447b8a3b8e2 100644
--- a/Documentation/driver-api/tty/n_gsm.rst
+++ b/Documentation/driver-api/tty/n_gsm.rst
@@ -25,6 +25,8 @@ Config Initiator
 #. Switch the serial line to using the n_gsm line discipline by using
    ``TIOCSETD`` ioctl.
 
+#. Configure the mux using ``GSMIOC_GETCONF_EXT``/``GSMIOC_SETCONF_EXT`` ioctl if needed.
+
 #. Configure the mux using ``GSMIOC_GETCONF``/``GSMIOC_SETCONF`` ioctl.
 
 #. Obtain base gsmtty number for the used serial port.
@@ -42,6 +44,7 @@ Config Initiator
 
       int ldisc = N_GSM0710;
       struct gsm_config c;
+      struct gsm_config_ext ce;
       struct termios configuration;
       uint32_t first;
 
@@ -62,6 +65,12 @@ Config Initiator
       /* use n_gsm line discipline */
       ioctl(fd, TIOCSETD, &ldisc);
 
+      /* get n_gsm extended configuration */
+      ioctl(fd, GSMIOC_GETCONF_EXT, &ce);
+      /* use keep-alive once every 5s for modem connection supervision */
+      ce.keep_alive = 500;
+      /* set the new extended configuration */
+      ioctl(fd, GSMIOC_SETCONF_EXT, &ce);
       /* get n_gsm configuration */
       ioctl(fd, GSMIOC_GETCONF, &c);
       /* we are initiator and need encoding 0 (basic) */
@@ -106,6 +115,9 @@ Config Requester
 #. Switch the serial line to using the *n_gsm* line discipline by using
    ``TIOCSETD`` ioctl.
 
+#. Configure the mux using ``GSMIOC_GETCONF_EXT``/``GSMIOC_SETCONF_EXT``
+   ioctl if needed.
+
 #. Configure the mux using ``GSMIOC_GETCONF``/``GSMIOC_SETCONF`` ioctl.
 
 #. Obtain base gsmtty number for the used serial port::
@@ -119,6 +131,7 @@ Config Requester
 
 	int ldisc = N_GSM0710;
 	struct gsm_config c;
+	struct gsm_config_ext ce;
 	struct termios configuration;
 	uint32_t first;
 
@@ -132,6 +145,12 @@ Config Requester
 	/* use n_gsm line discipline */
 	ioctl(fd, TIOCSETD, &ldisc);
 
+	/* get n_gsm extended configuration */
+	ioctl(fd, GSMIOC_GETCONF_EXT, &ce);
+	/* use keep-alive once every 5s for peer connection supervision */
+	ce.keep_alive = 500;
+	/* set the new extended configuration */
+	ioctl(fd, GSMIOC_SETCONF_EXT, &ce);
 	/* get n_gsm configuration */
 	ioctl(fd, GSMIOC_GETCONF, &c);
 	/* we are requester and need encoding 0 (basic) */