[PATCH v3 03/18] i.MX: serial: Add baud rate calculation convenience functions

[Andrey Smirnov]

Add two functions to calculate values for UBMR and UBIR
registers. This way both early serial initalization code and
serial_imx.c can use them and not duplicate the code.

Singed-off-by: Andrey Smirnov <andrew.smirnov at gmail.com>
---
 drivers/serial/serial_imx.c | 4 ++--
 include/serial/imx-uart.h   | 9 +++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/serial/serial_imx.c b/drivers/serial/serial_imx.c
index 6ae87fd..12155ad 100644
--- a/drivers/serial/serial_imx.c
+++ b/drivers/serial/serial_imx.c
@@ -178,9 +178,9 @@ static int imx_serial_setbaudrate(struct console_device *cdev, int baudrate)
 	writel(val, regs + UCR1);
 
 	/* Set the numerator value minus one of the BRM ratio */
-	writel((baudrate / 100) - 1, regs + UBIR);
+	writel(baudrate_to_ubir(baudrate), regs + UBIR);
 	/* Set the denominator value minus one of the BRM ratio    */
-	writel((imx_serial_reffreq(priv) / 1600) - 1, regs + UBMR);
+	writel(refclock_to_ubmr(imx_serial_reffreq(priv)), regs + UBMR);
 
 	writel(ucr1, regs + UCR1);
 
diff --git a/include/serial/imx-uart.h b/include/serial/imx-uart.h
index 0a01788..7275e6a 100644
--- a/include/serial/imx-uart.h
+++ b/include/serial/imx-uart.h
@@ -115,5 +115,14 @@
 #define  UTS_RXFULL 	 (1<<3)	 /* RxFIFO full */
 #define  UTS_SOFTRST	 (1<<0)	 /* Software reset */
 
+static inline int baudrate_to_ubir(int baudrate)
+{
+	return baudrate / 100 - 1;
+}
+
+static inline int refclock_to_ubmr(int clock_hz)
+{
+	return clock_hz / 1600 - 1;
+}
 
 #endif	/* __IMX_UART_H__ */
-- 
2.1.4