misc: at25: Switch to use BIT() instead of custom approaches

It's obvious that custom approach of getting power of 2 number with
int_pow() kinda interesting. Replace it and some others approaches
by using a simple BIT() operation.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211125213203.86693-7-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c
index 70cab38..c9660a4 100644 (file)
--- a/drivers/misc/eeprom/at25.c
+++ b/drivers/misc/eeprom/at25.c
@@ -6,6 +6,7 @@
  * Copyright (C) 2006 David Brownell
  */
 
+#include <linux/bits.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -17,7 +18,6 @@
 #include <linux/spi/spi.h>
 #include <linux/spi/eeprom.h>
 #include <linux/property.h>
-#include <linux/math.h>
 
 /*
  * NOTE: this is an *EEPROM* driver.  The vagaries of product naming
@@ -94,7 +94,7 @@ static int at25_ee_read(void *priv, unsigned int offset,
 
        instr = AT25_READ;
        if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR)
-               if (offset >= (1U << (at25->addrlen * 8)))
+               if (offset >= BIT(at25->addrlen * 8))
                        instr |= AT25_INSTR_BIT3;
        *cp++ = instr;
 
@@ -227,7 +227,7 @@ static int at25_ee_write(void *priv, unsigned int off, void *val, size_t count)
 
                instr = AT25_WRITE;
                if (at25->chip.flags & EE_INSTR_BIT3_IS_ADDR)
-                       if (offset >= (1U << (at25->addrlen * 8)))
+                       if (offset >= BIT(at25->addrlen * 8))
                                instr |= AT25_INSTR_BIT3;
                *cp++ = instr;
 
@@ -437,7 +437,7 @@ static int at25_probe(struct spi_device *spi)
                        return -ENODEV;
                }
 
-               at25->chip.byte_len = int_pow(2, id[7] - 0x21 + 4) * 1024;
+               at25->chip.byte_len = BIT(id[7] - 0x21 + 4) * 1024;
                if (at25->chip.byte_len > 64 * 1024)
                        at25->chip.flags |= EE_ADDR3;
                else