pch_uart: Add user_uartclk parameter
For cases where boards with non-default clocks are not yet added to the kernel or when the clock varies across hardware revisions, it is useful to be able to specify the UART clock on the kernel command line. Add the user_uartclk parameter and prefer it, if set, to the default and board specific UART clock settings. Specify user_uartclock on the command-line with "pch_uart.user_uartclk=48000000". Signed-off-by: Darren Hart <dvhart@linux.intel.com> CC: Tomoya MORINAGA <tomoya.rohm@gmail.com> CC: Feng Tang <feng.tang@intel.com> CC: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
077175f08e
commit
2a44feb20b
|
@ -295,6 +295,7 @@ static struct pch_uart_driver_data drv_dat[] = {
|
|||
static struct eg20t_port *pch_uart_ports[PCH_UART_NR];
|
||||
#endif
|
||||
static unsigned int default_baud = 9600;
|
||||
static unsigned int user_uartclk = 0;
|
||||
static const int trigger_level_256[4] = { 1, 64, 128, 224 };
|
||||
static const int trigger_level_64[4] = { 1, 16, 32, 56 };
|
||||
static const int trigger_level_16[4] = { 1, 4, 8, 14 };
|
||||
|
@ -372,6 +373,9 @@ static int pch_uart_get_uartclk(void)
|
|||
{
|
||||
const char *cmp;
|
||||
|
||||
if (user_uartclk)
|
||||
return user_uartclk;
|
||||
|
||||
cmp = dmi_get_system_info(DMI_BOARD_NAME);
|
||||
if (cmp && strstr(cmp, "CM-iTC"))
|
||||
return CMITC_UARTCLK;
|
||||
|
@ -1860,3 +1864,4 @@ module_exit(pch_uart_module_exit);
|
|||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
|
||||
module_param(default_baud, uint, S_IRUGO);
|
||||
module_param(user_uartclk, uint, S_IRUGO);
|
||||
|
|
Loading…
Reference in a new issue