Merge: ice: Enable GNSS write capability

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/1938

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2111048

Series enable GNSS write capability and switch to GNSS subsystem instead of TTY

Signed-off-by: Petr Oros <poros@redhat.com>

Approved-by: Michal Schmidt <mschmidt@redhat.com>
Approved-by: Kamal Heib <kheib@redhat.com>

Signed-off-by: Herton R. Krzesinski <herton@redhat.com>

Author: Herton R. Krzesinski

Documentation/networking/device_drivers/ethernet/intel/ice.rst

@@ -902,6 +902,17 @@ To enable/disable UDP Segmentation Offload, issue the following command::
   # ethtool -K <ethX> tx-udp-segmentation [off|on]
 
 
+GNSS module
+-----------
+Requires kernel compiled with CONFIG_GNSS=y or CONFIG_GNSS=m.
+Allows user to read messages from the GNSS hardware module and write supported
+commands. If the module is physically present, a GNSS device is spawned:
+``/dev/gnss<id>``.
+The protocol of write command is dependent on the GNSS hardware module as the
+driver writes raw bytes by the GNSS object to the receiver through i2c. Please
+refer to the hardware GNSS module documentation for configuration details.
+
+
 Performance Optimization
 ========================
 Driver defaults are meant to fit a wide variety of workloads, but if further

drivers/net/ethernet/intel/Kconfig

@@ -337,6 +337,9 @@ config ICE_HWTS
 	  the PTP clock driver precise cross-timestamp ioctl
 	  (PTP_SYS_OFFSET_PRECISE).
 
+config ICE_GNSS
+	def_bool GNSS = y || GNSS = ICE
+
 config FM10K
 	tristate "Intel(R) FM10000 Ethernet Switch Host Interface Support"
 	default n

drivers/net/ethernet/intel/ice/Makefile

@@ -42,8 +42,8 @@ ice-$(CONFIG_PCI_IOV) +=	\
 	ice_vf_vsi_vlan_ops.o	\
 	ice_vf_lib.o
 ice-$(CONFIG_PTP_1588_CLOCK) += ice_ptp.o ice_ptp_hw.o
-ice-$(CONFIG_TTY) += ice_gnss.o
 ice-$(CONFIG_DCB) += ice_dcb.o ice_dcb_nl.o ice_dcb_lib.o
 ice-$(CONFIG_RFS_ACCEL) += ice_arfs.o
 ice-$(CONFIG_XDP_SOCKETS) += ice_xsk.o
 ice-$(CONFIG_ICE_SWITCHDEV) += ice_eswitch.o
+ice-$(CONFIG_ICE_GNSS) += ice_gnss.o

drivers/net/ethernet/intel/ice/ice.h

@@ -39,6 +39,7 @@
 #include <linux/avf/virtchnl.h>
 #include <linux/cpu_rmap.h>
 #include <linux/dim.h>
+#include <linux/gnss.h>
 #include <net/pkt_cls.h>
 #include <net/tc_act/tc_mirred.h>
 #include <net/tc_act/tc_gact.h>
@@ -543,9 +544,8 @@ struct ice_pf {
 	struct mutex adev_mutex;	/* lock to protect aux device access */
 	u32 msg_enable;
 	struct ice_ptp ptp;
-	struct tty_driver *ice_gnss_tty_driver;
-	struct tty_port gnss_tty_port;
 	struct gnss_serial *gnss_serial;
+	struct gnss_device *gnss_dev;
 	u16 num_rdma_msix;		/* Total MSIX vectors for RDMA driver */
 	u16 rdma_base_vector;