summaryrefslogtreecommitdiff
path: root/drivers/serial/Kconfig
diff options
context:
space:
mode:
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2017-02-28 12:04:10 (GMT)
committerBin Meng <bmeng.cn@gmail.com>2017-04-10 02:02:03 (GMT)
commitc5f8dd482b4178cda30be7355085a70521cd4813 (patch)
tree78a3baf00ff94a03e6bf4053a0449eb484fa31dd /drivers/serial/Kconfig
parentae5564d1aec8b39f55f283f8d187b7b1603533bf (diff)
downloadu-boot-fsl-qoriq-c5f8dd482b4178cda30be7355085a70521cd4813.tar.xz
serial: Add serial driver for Intel MID
Add a specific serial driver for Intel MID platforms. It has special fractional divider which can be programmed via UART_PS, UART_MUL, and UART_DIV registers. The UART clock is calculated as UART clock = XTAL * UART_MUL / UART_DIV The baudrate is calculated as baud rate = UART clock / UART_PS / DLAB Initialize fractional divider correctly for Intel Edison platform. For backward compatibility we have to set initial DLAB value to 16 and speed to 115200 baud, where initial frequency is 29491200Hz, and XTAL frequency is 38.4MHz. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Diffstat (limited to 'drivers/serial/Kconfig')
-rw-r--r--drivers/serial/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 0900cc8..c0ec2ec 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -376,6 +376,15 @@ config SYS_NS16550
be used. It can be a constant or a function to get clock, eg,
get_serial_clock().
+config INTEL_MID_SERIAL
+ bool "Intel MID platform UART support"
+ depends on DM_SERIAL && OF_CONTROL
+ depends on INTEL_MID
+ select SYS_NS16550
+ help
+ Select this to enable a UART for Intel MID platforms.
+ This uses the ns16550 driver as a library.
+
config ROCKCHIP_SERIAL
bool "Rockchip on-chip UART support"
depends on DM_SERIAL && SPL_OF_PLATDATA