[PATCH 040/145] pch_uart: Add uart_clk selection for the MinnowBoard

[Kamal Mostafa]

3.8.13.5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Darren Hart <dvhart at linux.intel.com>

commit 29692d05647cb7ecea56242241f77291d5624b95 upstream.

Use DMI_BOARD_NAME to determine if we are running on a MinnowBoard and
set the uart clock to 50MHz if so. This removes the need to pass the
user_uartclk to the kernel at boot time.

Signed-off-by: Darren Hart <dvhart at linux.intel.com>
Cc: Jiri Slaby <jslaby at suse.cz>
Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: Peter Waskiewicz <peter.p.waskiewicz.jr at intel.com>
Cc: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/tty/serial/pch_uart.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 8318925..a9e4be7 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -214,6 +214,7 @@ enum {
 #define FRI2_64_UARTCLK  64000000 /*  64.0000 MHz */
 #define FRI2_48_UARTCLK  48000000 /*  48.0000 MHz */
 #define NTC1_UARTCLK     64000000 /*  64.0000 MHz */
+#define MINNOW_UARTCLK   50000000 /*  50.0000 MHz */
 
 struct pch_uart_buffer {
 	unsigned char *buf;
@@ -395,6 +396,10 @@ static int pch_uart_get_uartclk(void)
 		    strstr(cmp, "nanoETXexpress-TT")))
 		return NTC1_UARTCLK;
 
+	cmp = dmi_get_system_info(DMI_BOARD_NAME);
+	if (cmp && strstr(cmp, "MinnowBoard"))
+		return MINNOW_UARTCLK;
+
 	return DEFAULT_UARTCLK;
 }
 
-- 
1.8.1.2