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serial: pch_uart: Add support for reading clock-frequency from DT 

The MIPS based Boston platform provides a 25MHz clock to the UART.

Enable the driver for MIPS and add support in the driver to read
the frequency from device tree.

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zubair Lutfullah Kakakhel 2016-08-12 12:48:54 +01:00 committed by Greg Kroah-Hartman
parent bed3d7baba
commit 7789e5a2ac
2 changed files with 6 additions and 1 deletions
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2
drivers/tty/serial/Kconfig
View File

@ -1380,7 +1380,7 @@ config SERIAL_IFX6X60
config SERIAL_PCH_UART
tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) UART"
depends on PCI && (X86_32 || COMPILE_TEST)
depends on PCI && (X86_32 || MIPS || COMPILE_TEST)
select SERIAL_CORE
help
This driver is for PCH(Platform controller Hub) UART of Intel EG20T

5
drivers/tty/serial/pch_uart.c
View File

@ -31,6 +31,7 @@
#include <linux/dmi.h>
#include <linux/nmi.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/debugfs.h>
#include <linux/dmaengine.h>
@ -1826,6 +1827,10 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
priv->trigger_level = 1;
priv->fcr = 0;
if (pdev->dev.of_node)
of_property_read_u32(pdev->dev.of_node, "clock-frequency"
, &user_uartclk);
#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
pch_uart_ports[board->line_no] = priv;
#endif