Revert "changing how POR is handled, to use a time delay to wait for …

…device to be ready instead of polling the POR status bit which has read to clear behavior."

This reverts commit 2d0f342.

drivers/adc/ad7124/ad7124.c

@@ -4,7 +4,7 @@
 *   @devices AD7124-4, AD7124-8
 *
 ********************************************************************************
-* Copyright 2015, 2019 (c) Analog Devices, Inc.
+* Copyright 2015(c) Analog Devices, Inc.
 *
 * All rights reserved.
 *
@@ -47,15 +47,7 @@
 /* Error codes */
 #define INVALID_VAL -1 /* Invalid argument */
 #define COMM_ERR    -2 /* Communication error on receive */
-#define TIMEOUT     -3 /* A timeout has occurred */
-
-/*
- * Post reset delay required to ensure all internal config done
- * A time of 2ms should be enough based on the data sheet, but 4ms
- * chosen to provide enough margin, in case mdelay is not accurate.
- */
-#define AD7124_POST_RESET_DELAY      4
-
+#define TIMEOUT     -3 /* A timeout has occured */
 
 /***************************************************************************//**
  * @brief Reads the value of the specified register without checking if the
@@ -239,12 +231,10 @@ int32_t ad7124_reset(struct ad7124_dev *dev)
 				 wr_buf,
 				 8);
 
-	/* Read POR bit to clear */
+	/* Wait for the reset to complete */
 	ret = ad7124_wait_to_power_on(dev,
 				      dev->spi_rdy_poll_cnt);
 
-	mdelay(AD7124_POST_RESET_DELAY);
-
 	return ret;
 }
 

drivers/adc/ad7124/ad7124.h

@@ -4,7 +4,7 @@
 *   @devices AD7124-4, AD7124-8
 *
 ********************************************************************************
-* Copyright 2015, 2019 (c) Analog Devices, Inc.
+* Copyright 2015(c) Analog Devices, Inc.
 *
 * All rights reserved.
 *
@@ -46,7 +46,6 @@
 /******************************************************************************/
 #include <stdint.h>
 #include "spi.h"
-#include "delay.h"
 
 /******************************************************************************/
 /******************* Register map and register definitions ********************/