iio: imu: inv_icm42600: make timestamp module chip independent

Move icm42600 dependent function inside the core module.
Do some headers cleanup at the same time.
Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20230606162147.79667-2-inv.git-commit@tdk.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/imu/inv_icm42600/inv_icm42600_core.c

@@ -516,6 +516,17 @@ static int inv_icm42600_irq_init(struct inv_icm42600_state *st, int irq,
 					 "inv_icm42600", st);
 }
 
+static int inv_icm42600_timestamp_setup(struct inv_icm42600_state *st)
+{
+	unsigned int val;
+
+	/* enable timestamp register */
+	val = INV_ICM42600_TMST_CONFIG_TMST_TO_REGS_EN |
+	      INV_ICM42600_TMST_CONFIG_TMST_EN;
+	return regmap_update_bits(st->map, INV_ICM42600_REG_TMST_CONFIG,
+				  INV_ICM42600_TMST_CONFIG_MASK, val);
+}
+
 static int inv_icm42600_enable_regulator_vddio(struct inv_icm42600_state *st)
 {
 	int ret;

drivers/iio/imu/inv_icm42600/inv_icm42600_timestamp.c

@@ -3,11 +3,10 @@
  * Copyright (C) 2020 Invensense, Inc.
  */
 
+#include <linux/errno.h>
 #include <linux/kernel.h>
-#include <linux/regmap.h>
 #include <linux/math64.h>
 
-#include "inv_icm42600.h"
 #include "inv_icm42600_timestamp.h"
 
 /* internal chip period is 32kHz, 31250ns */
@@ -56,17 +55,6 @@ void inv_icm42600_timestamp_init(struct inv_icm42600_timestamp *ts,
 	inv_update_acc(&ts->chip_period, INV_ICM42600_TIMESTAMP_PERIOD);
 }
 
-int inv_icm42600_timestamp_setup(struct inv_icm42600_state *st)
-{
-	unsigned int val;
-
-	/* enable timestamp register */
-	val = INV_ICM42600_TMST_CONFIG_TMST_TO_REGS_EN |
-	      INV_ICM42600_TMST_CONFIG_TMST_EN;
-	return regmap_update_bits(st->map, INV_ICM42600_REG_TMST_CONFIG,
-				  INV_ICM42600_TMST_CONFIG_MASK, val);
-}
-
 int inv_icm42600_timestamp_update_odr(struct inv_icm42600_timestamp *ts,
 				      uint32_t period, bool fifo)
 {

drivers/iio/imu/inv_icm42600/inv_icm42600_timestamp.h

@@ -6,10 +6,6 @@
 #ifndef INV_ICM42600_TIMESTAMP_H_
 #define INV_ICM42600_TIMESTAMP_H_
 
-#include <linux/kernel.h>
-
-struct inv_icm42600_state;
-
 /**
  * struct inv_icm42600_timestamp_interval - timestamps interval
  * @lo:	interval lower bound
@@ -53,8 +49,6 @@ struct inv_icm42600_timestamp {
 void inv_icm42600_timestamp_init(struct inv_icm42600_timestamp *ts,
 				 uint32_t period);
 
-int inv_icm42600_timestamp_setup(struct inv_icm42600_state *st);
-
 int inv_icm42600_timestamp_update_odr(struct inv_icm42600_timestamp *ts,
 				      uint32_t period, bool fifo);