kernel: modules: package module for Exar 8250 UARTs

Signed-off-by: Daniel Golle <[email protected]>

package/kernel/linux/modules/other.mk

@@ -698,6 +698,22 @@ endef
 $(eval $(call KernelPackage,serial-8250))
 
 
+define KernelPackage/serial-8250-exar
+  SUBMENU:=$(OTHER_MENU)
+  TITLE:=Exar 8250 UARTs
+  KCONFIG:= CONFIG_SERIAL_8250_EXAR
+  FILES:=$(LINUX_DIR)/drivers/tty/serial/8250/8250_exar.ko
+  AUTOLOAD:=$(call AutoProbe,8250 8250_base 8250_exar)
+  DEPENDS:=+kmod-serial-8250
+endef
+
+define KernelPackage/serial-8250-exar/description
+ Kernel module for Exar serial ports
+endef
+
+$(eval $(call KernelPackage,serial-8250-exar))
+
+
 define KernelPackage/regmap
   SUBMENU:=$(OTHER_MENU)
   TITLE:=Generic register map support

target/linux/generic/pending-4.14/950-tty-serial-exar-generalize-rs485-setup.patch

@@ -0,0 +1,81 @@
+From 24d5ba8ad40c3ac7903f688580c345aafa764dc7 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <[email protected]>
+Date: Mon, 4 Jun 2018 14:51:29 +0200
+Subject: [PATCH] tty: serial: exar: generalize rs485 setup
+To: [email protected],
+    Greg Kroah-Hartman <[email protected]>
+Cc: Linus Walleij <[email protected]>,
+    Jan Kiszka <[email protected]>
+
+Move the non-board-specific part of the RS485 initialization
+from iot2040_rs485_config function to a new generic function
+used also for other boards.
+This allows using PCIe boards which are hard-wired to RS485
+or have jumpers for their configurations.
+
+Signed-off-by: Daniel Golle <[email protected]>
+---
+ drivers/tty/serial/8250/8250_exar.c | 38 +++++++++++++++++++----------
+ 1 file changed, 25 insertions(+), 13 deletions(-)
+
+diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
+index e0aa5f03004c..55b4d6d581f0 100644
+--- a/drivers/tty/serial/8250/8250_exar.c
++++ b/drivers/tty/serial/8250/8250_exar.c
+@@ -275,8 +275,32 @@ static int xr17v35x_register_gpio(struct pci_dev *pcidev,
+ 	return 0;
+ }
+ 
++static int generic_rs485_config(struct uart_port *port,
++				struct serial_rs485 *rs485)
++{
++	bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED);
++	u8 __iomem *p = port->membase;
++	u8 value;
++
++	value = readb(p + UART_EXAR_FCTR);
++	if (is_rs485)
++		value |= UART_FCTR_EXAR_485;
++	else
++		value &= ~UART_FCTR_EXAR_485;
++
++	writeb(value, p + UART_EXAR_FCTR);
++
++	if (is_rs485)
++		writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
++
++	port->rs485 = *rs485;
++
++	return 0;
++}
++
+ static const struct exar8250_platform exar8250_default_platform = {
+ 	.register_gpio = xr17v35x_register_gpio,
++	.rs485_config = generic_rs485_config,
+ };
+ 
+ static int iot2040_rs485_config(struct uart_port *port,
+@@ -309,19 +333,7 @@ static int iot2040_rs485_config(struct uart_port *port,
+ 	value |= mode;
+ 	writeb(value, p + UART_EXAR_MPIOLVL_7_0);
+ 
+-	value = readb(p + UART_EXAR_FCTR);
+-	if (is_rs485)
+-		value |= UART_FCTR_EXAR_485;
+-	else
+-		value &= ~UART_FCTR_EXAR_485;
+-	writeb(value, p + UART_EXAR_FCTR);
+-
+-	if (is_rs485)
+-		writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
+-
+-	port->rs485 = *rs485;
+-
+-	return 0;
++	return generic_rs485_config(port, rs485);
+ }
+ 
+ static const struct property_entry iot2040_gpio_properties[] = {
+-- 
+2.17.1
+