From 7789e5a2accdbc5d506405c11ef4e5469440e96b Mon Sep 17 00:00:00 2001 From: Zubair Lutfullah Kakakhel Date: Fri, 12 Aug 2016 12:48:54 +0100 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/Kconfig | 2 +- drivers/tty/serial/pch_uart.c | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 518db24a..c783140 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -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 diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index ea4ffc2..23672f8 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -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 -- 2.7.4