ptp: mark symbols static where possible

We get 1 warning when building kernel with W=1:
drivers/ptp/ptp_pch.c:182:5: warning: no previous prototype for ‘pch_ch_control_read’ [-Wmissing-prototypes]
 u32 pch_ch_control_read(struct pci_dev *pdev)
drivers/ptp/ptp_pch.c:193:6: warning: no previous prototype for ‘pch_ch_control_write’ [-Wmissing-prototypes]
 void pch_ch_control_write(struct pci_dev *pdev, u32 val)
drivers/ptp/ptp_pch.c:201:5: warning: no previous prototype for ‘pch_ch_event_read’ [-Wmissing-prototypes]
 u32 pch_ch_event_read(struct pci_dev *pdev)
drivers/ptp/ptp_pch.c:212:6: warning: no previous prototype for ‘pch_ch_event_write’ [-Wmissing-prototypes]
 void pch_ch_event_write(struct pci_dev *pdev, u32 val)
drivers/ptp/ptp_pch.c:220:5: warning: no previous prototype for ‘pch_src_uuid_lo_read’ [-Wmissing-prototypes]
 u32 pch_src_uuid_lo_read(struct pci_dev *pdev)
drivers/ptp/ptp_pch.c:231:5: warning: no previous prototype for ‘pch_src_uuid_hi_read’ [-Wmissing-prototypes]
 u32 pch_src_uuid_hi_read(struct pci_dev *pdev)
drivers/ptp/ptp_pch.c:242:5: warning: no previous prototype for ‘pch_rx_snap_read’ [-Wmissing-prototypes]
 u64 pch_rx_snap_read(struct pci_dev *pdev)
drivers/ptp/ptp_pch.c:259:5: warning: no previous prototype for ‘pch_tx_snap_read’ [-Wmissing-prototypes]
 u64 pch_tx_snap_read(struct pci_dev *pdev)
drivers/ptp/ptp_pch.c:300:5: warning: no previous prototype for ‘pch_set_station_address’ [-Wmissing-prototypes]
 int pch_set_station_address(u8 *addr, struct pci_dev *pdev)

Signed-off-by: Herrington <hankinsea@gmail.com>

drivers/ptp/ptp_pch.c

@@ -179,17 +179,6 @@ static inline void pch_block_reset(struct pch_dev *chip)
 	iowrite32(val, (&chip->regs->control));
 }
 
-u32 pch_ch_control_read(struct pci_dev *pdev)
-{
-	struct pch_dev *chip = pci_get_drvdata(pdev);
-	u32 val;
-
-	val = ioread32(&chip->regs->ch_control);
-
-	return val;
-}
-EXPORT_SYMBOL(pch_ch_control_read);
-
 void pch_ch_control_write(struct pci_dev *pdev, u32 val)
 {
 	struct pch_dev *chip = pci_get_drvdata(pdev);

include/linux/ptp_clock_kernel.h

@@ -307,4 +307,13 @@ static inline void ptp_read_system_postts(struct ptp_system_timestamp *sts)
 		ktime_get_real_ts64(&sts->post_ts);
 }
 
+void pch_ch_control_write(struct pci_dev *pdev, u32 val);
+u32 pch_ch_event_read(struct pci_dev *pdev);
+void pch_ch_event_write(struct pci_dev *pdev, u32 val);
+u32 pch_src_uuid_lo_read(struct pci_dev *pdev);
+u32 pch_src_uuid_hi_read(struct pci_dev *pdev);
+u64 pch_rx_snap_read(struct pci_dev *pdev);
+u64 pch_tx_snap_read(struct pci_dev *pdev);
+int pch_set_station_address(u8 *addr, struct pci_dev *pdev);
+
 #endif