diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
index 55cef5b16aa5f..a6823c4d355d5 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
@@ -612,15 +612,6 @@ void pch_gbe_free_tx_resources(struct pch_gbe_adapter *adapter,
 void pch_gbe_free_rx_resources(struct pch_gbe_adapter *adapter,
 			       struct pch_gbe_rx_ring *rx_ring);
 void pch_gbe_update_stats(struct pch_gbe_adapter *adapter);
-u32 pch_ch_control_read(struct pci_dev *pdev);
-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);
 
 /* pch_gbe_param.c */
 void pch_gbe_check_options(struct pch_gbe_adapter *adapter);
diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 140cee7c459d0..334af49e5add1 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <linux/net_tstamp.h>
 #include <linux/ptp_classify.h>
+#include <linux/ptp_pch.h>
 #include <linux/gpio.h>
 
 #define DRV_VERSION     "1.01"
diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c
index 75463c2e2b867..fa636951169e5 100644
--- a/drivers/ptp/ptp_clockmatrix.c
+++ b/drivers/ptp/ptp_clockmatrix.c
@@ -1404,8 +1404,8 @@ static int idtcm_set_pll_mode(struct idtcm_channel *channel,
 
 /* PTP Hardware Clock interface */
 
-/**
- * @brief Maximum absolute value for write phase offset in picoseconds
+/*
+ * Maximum absolute value for write phase offset in picoseconds
  *
  * Destination signed register is 32-bit register in resolution of 50ps
  *
diff --git a/drivers/ptp/ptp_pch.c b/drivers/ptp/ptp_pch.c
index ce10ecd41ba0f..a17e8cc642c5f 100644
--- a/drivers/ptp/ptp_pch.c
+++ b/drivers/ptp/ptp_pch.c
@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/ptp_clock_kernel.h>
+#include <linux/ptp_pch.h>
 #include <linux/slab.h>
 
 #define STATION_ADDR_LEN	20
@@ -36,7 +37,8 @@ enum pch_status {
 	PCH_FAILED,
 	PCH_UNSUPPORTED,
 };
-/**
+
+/*
  * struct pch_ts_regs - IEEE 1588 registers
  */
 struct pch_ts_regs {
@@ -102,7 +104,8 @@ struct pch_ts_regs {
 
 #define PCH_IEEE1588_ETH	(1 << 0)
 #define PCH_IEEE1588_CAN	(1 << 1)
-/**
+
+/*
  * struct pch_dev - Driver private data
  */
 struct pch_dev {
@@ -119,7 +122,7 @@ struct pch_dev {
 	spinlock_t register_lock;
 };
 
-/**
+/*
  * struct pch_params - 1588 module parameter
  */
 struct pch_params {
@@ -179,17 +182,6 @@ 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);
@@ -296,6 +288,7 @@ static void pch_reset(struct pch_dev *chip)
  *				    IEEE 1588 hardware when looking at PTP
  *				    traffic on the  ethernet interface
  * @addr:	dress which contain the column separated address to be used.
+ * @pdev:	PCI device.
  */
 int pch_set_station_address(u8 *addr, struct pci_dev *pdev)
 {
diff --git a/include/linux/ptp_pch.h b/include/linux/ptp_pch.h
new file mode 100644
index 0000000000000..51818198c2921
--- /dev/null
+++ b/include/linux/ptp_pch.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * PTP PCH
+ *
+ * Copyright 2019 Linaro Ltd.
+ *
+ * Author Lee Jones <lee.jones@linaro.org>
+ */
+
+#ifndef _PTP_PCH_H_
+#define _PTP_PCH_H_
+
+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 /* _PTP_PCH_H_ */