serial: Update NS16550_t and struct NS16550

Typedefs should not be used in U-Boot and structs should be lower case.
Update the code to use struct ns16550 consistently.

Put a header guard on the file while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 8dd81ad..d529b1b 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -156,7 +156,7 @@
 
 #endif /* CONFIG_NS16550_DYNAMIC */
 
-static void ns16550_writeb(NS16550_t port, int offset, int value)
+static void ns16550_writeb(struct ns16550 *port, int offset, int value)
 {
 	struct ns16550_plat *plat = port->plat;
 	unsigned char *addr;
@@ -170,7 +170,7 @@
 		serial_out_shift(addr, plat->reg_shift, value);
 }
 
-static int ns16550_readb(NS16550_t port, int offset)
+static int ns16550_readb(struct ns16550 *port, int offset)
 {
 	struct ns16550_plat *plat = port->plat;
 	unsigned char *addr;
@@ -184,7 +184,7 @@
 		return serial_in_shift(addr, plat->reg_shift);
 }
 
-static u32 ns16550_getfcr(NS16550_t port)
+static u32 ns16550_getfcr(struct ns16550 *port)
 {
 	struct ns16550_plat *plat = port->plat;
 
@@ -199,20 +199,20 @@
 	ns16550_readb(com_port, \
 		(unsigned char *)addr - (unsigned char *)com_port)
 #else
-static u32 ns16550_getfcr(NS16550_t port)
+static u32 ns16550_getfcr(struct ns16550 *port)
 {
 	return UART_FCR_DEFVAL;
 }
 #endif
 
-int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
+int ns16550_calc_divisor(struct ns16550 *port, int clock, int baudrate)
 {
 	const unsigned int mode_x_div = 16;
 
 	return DIV_ROUND_CLOSEST(clock, mode_x_div * baudrate);
 }
 
-static void NS16550_setbrg(NS16550_t com_port, int baud_divisor)
+static void NS16550_setbrg(struct ns16550 *com_port, int baud_divisor)
 {
 	/* to keep serial format, read lcr before writing BKSE */
 	int lcr_val = serial_in(&com_port->lcr) & ~UART_LCR_BKSE;
@@ -223,7 +223,7 @@
 	serial_out(lcr_val, &com_port->lcr);
 }
 
-void NS16550_init(NS16550_t com_port, int baud_divisor)
+void NS16550_init(struct ns16550 *com_port, int baud_divisor)
 {
 #if (defined(CONFIG_SPL_BUILD) && \
 		(defined(CONFIG_OMAP34XX) || defined(CONFIG_OMAP44XX)))
@@ -272,7 +272,7 @@
 }
 
 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
-void NS16550_reinit(NS16550_t com_port, int baud_divisor)
+void NS16550_reinit(struct ns16550 *com_port, int baud_divisor)
 {
 	serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
 	NS16550_setbrg(com_port, 0);
@@ -282,7 +282,7 @@
 }
 #endif /* CONFIG_NS16550_MIN_FUNCTIONS */
 
-void NS16550_putc(NS16550_t com_port, char c)
+void NS16550_putc(struct ns16550 *com_port, char c)
 {
 	while ((serial_in(&com_port->lsr) & UART_LSR_THRE) == 0)
 		;
@@ -299,7 +299,7 @@
 }
 
 #ifndef CONFIG_NS16550_MIN_FUNCTIONS
-char NS16550_getc(NS16550_t com_port)
+char NS16550_getc(struct ns16550 *com_port)
 {
 	while ((serial_in(&com_port->lsr) & UART_LSR_DR) == 0) {
 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_TTY)
@@ -311,7 +311,7 @@
 	return serial_in(&com_port->rbr);
 }
 
-int NS16550_tstc(NS16550_t com_port)
+int NS16550_tstc(struct ns16550 *com_port)
 {
 	return (serial_in(&com_port->lsr) & UART_LSR_DR) != 0;
 }
@@ -324,7 +324,7 @@
 
 static inline void _debug_uart_init(void)
 {
-	struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
+	struct ns16550 *com_port = (struct ns16550 *)CONFIG_DEBUG_UART_BASE;
 	int baud_divisor;
 
 	/*
@@ -345,7 +345,7 @@
 	serial_dout(&com_port->lcr, UART_LCRVAL);
 }
 
-static inline int NS16550_read_baud_divisor(struct NS16550 *com_port)
+static inline int NS16550_read_baud_divisor(struct ns16550 *com_port)
 {
 	int ret;
 
@@ -359,7 +359,7 @@
 
 static inline void _debug_uart_putc(int ch)
 {
-	struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
+	struct ns16550 *com_port = (struct ns16550 *)CONFIG_DEBUG_UART_BASE;
 
 	while (!(serial_din(&com_port->lsr) & UART_LSR_THRE)) {
 #ifdef CONFIG_DEBUG_UART_NS16550_CHECK_ENABLED
@@ -377,7 +377,7 @@
 #if CONFIG_IS_ENABLED(DM_SERIAL)
 static int ns16550_serial_putc(struct udevice *dev, const char ch)
 {
-	struct NS16550 *const com_port = dev_get_priv(dev);
+	struct ns16550 *const com_port = dev_get_priv(dev);
 
 	if (!(serial_in(&com_port->lsr) & UART_LSR_THRE))
 		return -EAGAIN;
@@ -397,7 +397,7 @@
 
 static int ns16550_serial_pending(struct udevice *dev, bool input)
 {
-	struct NS16550 *const com_port = dev_get_priv(dev);
+	struct ns16550 *const com_port = dev_get_priv(dev);
 
 	if (input)
 		return (serial_in(&com_port->lsr) & UART_LSR_DR) ? 1 : 0;
@@ -407,7 +407,7 @@
 
 static int ns16550_serial_getc(struct udevice *dev)
 {
-	struct NS16550 *const com_port = dev_get_priv(dev);
+	struct ns16550 *const com_port = dev_get_priv(dev);
 
 	if (!(serial_in(&com_port->lsr) & UART_LSR_DR))
 		return -EAGAIN;
@@ -417,7 +417,7 @@
 
 static int ns16550_serial_setbrg(struct udevice *dev, int baudrate)
 {
-	struct NS16550 *const com_port = dev_get_priv(dev);
+	struct ns16550 *const com_port = dev_get_priv(dev);
 	struct ns16550_plat *plat = com_port->plat;
 	int clock_divisor;
 
@@ -430,7 +430,7 @@
 
 static int ns16550_serial_setconfig(struct udevice *dev, uint serial_config)
 {
-	struct NS16550 *const com_port = dev_get_priv(dev);
+	struct ns16550 *const com_port = dev_get_priv(dev);
 	int lcr_val = UART_LCR_WLS_8;
 	uint parity = SERIAL_GET_PARITY(serial_config);
 	uint bits = SERIAL_GET_BITS(serial_config);
@@ -464,7 +464,7 @@
 static int ns16550_serial_getinfo(struct udevice *dev,
 				  struct serial_device_info *info)
 {
-	struct NS16550 *const com_port = dev_get_priv(dev);
+	struct ns16550 *const com_port = dev_get_priv(dev);
 	struct ns16550_plat *plat = com_port->plat;
 
 	info->type = SERIAL_CHIP_16550_COMPATIBLE;
@@ -499,7 +499,7 @@
 int ns16550_serial_probe(struct udevice *dev)
 {
 	struct ns16550_plat *plat = dev->plat;
-	struct NS16550 *const com_port = dev_get_priv(dev);
+	struct ns16550 *const com_port = dev_get_priv(dev);
 	struct reset_ctl_bulk reset_bulk;
 	fdt_addr_t addr;
 	int ret;
@@ -613,7 +613,7 @@
 	.of_to_plat = ns16550_serial_of_to_plat,
 	.plat_auto	= sizeof(struct ns16550_plat),
 #endif
-	.priv_auto	= sizeof(struct NS16550),
+	.priv_auto	= sizeof(struct ns16550),
 	.probe = ns16550_serial_probe,
 	.ops	= &ns16550_serial_ops,
 #if !CONFIG_IS_ENABLED(OF_CONTROL)