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pch_uart: Add uart_clk selection for the MinnowBoard

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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 <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Peter Waskiewicz <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Darren Hart 2013-06-25 18:53:22 -07:00 • committed by Greg Kroah-Hartman
commit 29692d0564
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/serial/pch_uart.c
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@ -217,6 +217,7 @@ 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;
@ -398,6 +399,10 @@ 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;
}