spi: omap2-mcspi: Switch to readl_poll_timeout()

Use standard readl_poll_timeout() macro for polling on status bits.
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-omap2-mcspi.c

@@ -33,6 +33,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/gcd.h>
+#include <linux/iopoll.h>
 
 #include <linux/spi/spi.h>
 #include <linux/gpio.h>
@@ -353,19 +354,9 @@ static void omap2_mcspi_set_fifo(const struct spi_device *spi,
 
 static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
 {
-	unsigned long timeout;
-
-	timeout = jiffies + msecs_to_jiffies(1000);
-	while (!(readl_relaxed(reg) & bit)) {
-		if (time_after(jiffies, timeout)) {
-			if (!(readl_relaxed(reg) & bit))
-				return -ETIMEDOUT;
-			else
-				return 0;
-		}
-		cpu_relax();
-	}
-	return 0;
+	u32 val;
+
+	return readl_poll_timeout(reg, val, val & bit, 1, MSEC_PER_SEC);
 }
 
 static void omap2_mcspi_rx_callback(void *data)