diff mbox series

[v3,3/6] serial: 8250: Add dl_read/write, bugs and mapsize into plat_serial8250_port

Message ID 20230509113924.19540-4-ilpo.jarvinen@linux.intel.com
State Superseded
Headers show
Series [v3,1/6] serial: 8250: Change dl_read/write to handle value as u32 | expand

Commit Message

Ilpo Järvinen May 9, 2023, 11:39 a.m. UTC 
Add mapsize, bugs, and divisor latch read/write functions
(->dl_read/write()) into plat_serial8250_port to carry the setup
necessary for RT288x/Au1xxx devices over to uart port.

Document the added members with kerneldoc style but do not enable
kerneldoc yet as there are many fields which remain undocumented.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
 drivers/tty/serial/8250/8250_core.c |  4 ++++
 include/linux/serial_8250.h         | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

Comments

Jiri Slaby (SUSE) May 10, 2023, 5:55 a.m. UTC | #1 
On 09. 05. 23, 13:39, Ilpo Järvinen wrote:
> Add mapsize, bugs, and divisor latch read/write functions
> (->dl_read/write()) into plat_serial8250_port to carry the setup
> necessary for RT288x/Au1xxx devices over to uart port.
> 
> Document the added members with kerneldoc style but do not enable
> kerneldoc yet as there are many fields which remain undocumented.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

> --- a/include/linux/serial_8250.h
> +++ b/include/linux/serial_8250.h
...
> @@ -28,8 +44,11 @@ struct plat_serial8250_port {
>   	unsigned char	has_sysrq;	/* supports magic SysRq */
>   	unsigned int	type;		/* If UPF_FIXED_TYPE */
>   	upf_t		flags;		/* UPF_* flags */
> +	unsigned short	bugs;		/* port bugs */

I would suggest u16 for bitfields like this. (Or DECLARE_BITMAP, but 
that would unnecessarily eat a long.)

thanks,
diff mbox series

Patch

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 13bf535eedcd..21b15b130d12 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -822,12 +822,16 @@  static int serial8250_probe(struct platform_device *dev)
 		uart.port.iotype	= p->iotype;
 		uart.port.flags		= p->flags;
 		uart.port.mapbase	= p->mapbase;
+		uart.port.mapsize	= p->mapsize;
 		uart.port.hub6		= p->hub6;
 		uart.port.has_sysrq	= p->has_sysrq;
 		uart.port.private_data	= p->private_data;
 		uart.port.type		= p->type;
+		uart.bugs		= p->bugs;
 		uart.port.serial_in	= p->serial_in;
 		uart.port.serial_out	= p->serial_out;
+		uart.dl_read		= p->dl_read;
+		uart.dl_write		= p->dl_write;
 		uart.port.handle_irq	= p->handle_irq;
 		uart.port.handle_break	= p->handle_break;
 		uart.port.set_termios	= p->set_termios;
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index d64e7bbe1f2f..82cd8d90a040 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -11,13 +11,29 @@ 
 #include <linux/serial_reg.h>
 #include <linux/platform_device.h>
 
+struct uart_8250_port;
+
 /*
  * This is the platform device platform_data structure
+ *
+ * @mapsize:	Port size for ioremap()
+ * @bugs:	Port bugs
+ *
+ * @dl_read: ``u32 ()(struct uart_8250_port *up)``
+ *
+ *	UART divisor latch read.
+ *
+ * @dl_write: ``void ()(struct uart_8250_port *up, u32 value)``
+ *
+ *	Write @value into UART divisor latch.
+ *
+ *	Locking: Caller holds port's lock.
  */
 struct plat_serial8250_port {
 	unsigned long	iobase;		/* io base address */
 	void __iomem	*membase;	/* ioremap cookie or NULL */
 	resource_size_t	mapbase;	/* resource base */
+	resource_size_t	mapsize;
 	unsigned int	uartclk;	/* UART clock rate */
 	unsigned int	irq;		/* interrupt number */
 	unsigned long	irqflags;	/* request_irq flags */
@@ -28,8 +44,11 @@  struct plat_serial8250_port {
 	unsigned char	has_sysrq;	/* supports magic SysRq */
 	unsigned int	type;		/* If UPF_FIXED_TYPE */
 	upf_t		flags;		/* UPF_* flags */
+	unsigned short	bugs;		/* port bugs */
 	unsigned int	(*serial_in)(struct uart_port *, int);
 	void		(*serial_out)(struct uart_port *, int, int);
+	u32		(*dl_read)(struct uart_8250_port *up);
+	void		(*dl_write)(struct uart_8250_port *up, u32 value);
 	void		(*set_termios)(struct uart_port *,
 			               struct ktermios *new,
 			               const struct ktermios *old);