octeontx2-nic: fix mixed module build

Building the VF and PF side of this driver differently, with one being
a loadable module and the other one built-in results in a link failure
for the common PTP driver:

ld.lld: error: undefined symbol: __this_module
>>> referenced by otx2_ptp.c
>>>               net/ethernet/marvell/octeontx2/nic/otx2_ptp.o:(otx2_ptp_init) in archive drivers/built-in.a
>>> referenced by otx2_ptp.c
>>>               net/ethernet/marvell/octeontx2/nic/otx2_ptp.o:(otx2_ptp_init) in archive drivers/built-in.a

Move the otx2_ptp.c code into a separate module that gets built for
both configurations, making it built-in if at least one of the other
two is built-in.

Fixes: 43510ef ("octeontx2-nicvf: Add PTP hardware clock support to NIX VF")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/nic/Makefile

@@ -3,12 +3,12 @@
 # Makefile for Marvell's RVU Ethernet device drivers
 #
 
-obj-$(CONFIG_OCTEONTX2_PF) += rvu_nicpf.o
-obj-$(CONFIG_OCTEONTX2_VF) += rvu_nicvf.o
+obj-$(CONFIG_OCTEONTX2_PF) += rvu_nicpf.o otx2_ptp.o
+obj-$(CONFIG_OCTEONTX2_VF) += rvu_nicvf.o otx2_ptp.o
 
 rvu_nicpf-y := otx2_pf.o otx2_common.o otx2_txrx.o otx2_ethtool.o \
-               otx2_ptp.o otx2_flows.o otx2_tc.o cn10k.o otx2_dmac_flt.o \
+               otx2_flows.o otx2_tc.o cn10k.o otx2_dmac_flt.o \
                otx2_devlink.o
-rvu_nicvf-y := otx2_vf.o otx2_devlink.o otx2_ptp.o
+rvu_nicvf-y := otx2_vf.o otx2_devlink.o
 
 ccflags-y += -I$(srctree)/drivers/net/ethernet/marvell/octeontx2/af

drivers/net/ethernet/marvell/octeontx2/nic/otx2_ptp.c

@@ -297,6 +297,7 @@ int otx2_ptp_init(struct otx2_nic *pfvf)
 error:
 	return err;
 }
+EXPORT_SYMBOL_GPL(otx2_ptp_init);
 
 void otx2_ptp_destroy(struct otx2_nic *pfvf)
 {
@@ -309,6 +310,7 @@ void otx2_ptp_destroy(struct otx2_nic *pfvf)
 	kfree(ptp);
 	pfvf->ptp = NULL;
 }
+EXPORT_SYMBOL_GPL(otx2_ptp_destroy);
 
 int otx2_ptp_clock_index(struct otx2_nic *pfvf)
 {
@@ -317,6 +319,7 @@ int otx2_ptp_clock_index(struct otx2_nic *pfvf)
 
 	return ptp_clock_index(pfvf->ptp->ptp_clock);
 }
+EXPORT_SYMBOL_GPL(otx2_ptp_clock_index);
 
 int otx2_ptp_tstamp2time(struct otx2_nic *pfvf, u64 tstamp, u64 *tsns)
 {
@@ -327,3 +330,8 @@ int otx2_ptp_tstamp2time(struct otx2_nic *pfvf, u64 tstamp, u64 *tsns)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(otx2_ptp_tstamp2time);
+
+MODULE_AUTHOR("Sunil Goutham <sgoutham@marvell.com>");
+MODULE_DESCRIPTION("Marvell RVU NIC PTP Driver");
+MODULE_LICENSE("GPL v2");