[V3,2/6] usb: serial: f81534: add auto RTS direction support

[Johan Hovold <johan@kernel.org>]

On Thu, Jan 11, 2018 at 02:47:16PM +0800, Ji-Ze Hong (Peter Hong) wrote:
> The F81532/534 had auto RTS direction support for RS485 mode.
> We'll read it from internal Flash with address 0x2f01~0x2f04 for 4 ports.
> There are 4 conditions below:
> 	0: F81534_PORT_CONF_RS232.
> 	1: F81534_PORT_CONF_RS485.
> 	2: value error, default to F81534_PORT_CONF_RS232.
> 	3: F81534_PORT_CONF_RS485_INVERT.
> 
> F81532/534 Clock register (offset +08h)
> 
> Bit0:	UART Enable (always on)
> Bit2-1:	Clock source selector
> 			00: 1.846MHz.
> 			01: 18.46MHz.
> 			10: 24MHz.
> 			11: 14.77MHz.
> Bit4:	Auto direction(RTS) control (RTS pin Low when TX)
> Bit5:	Invert direction(RTS) when Bit4 enabled (RTS pin high when TX)
> 
> Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
> ---
> V3:
> 	1: change some BIT() operation to GENMASK().
> 	2: change some dev_info() to dev_dbg().
> 
> V2:
> 	1: Read the configure data from flash and save it to shadow clock
> 	   register.

Series now applied with a few minor tweaks.

> +#define F81534_PORT_CONF_RS232		0
> +#define F81534_PORT_CONF_RS485		BIT(0)
> +#define F81534_PORT_CONF_RS485_INVERT	GENMASK(1, 0)

I replaced GENMASK() with your original (BIT(x) | BIT(y)) for register
values like this one.

>  #define F81534_PORT_CONF_DISABLE_PORT	BIT(3)
>  #define F81534_PORT_CONF_NOT_EXIST_PORT	BIT(7)
>  #define F81534_PORT_UNAVAILABLE		\
>  	(F81534_PORT_CONF_DISABLE_PORT | F81534_PORT_CONF_NOT_EXIST_PORT)
>  
> +#define F81534_UART_MODE_MASK		GENMASK(1, 0)

And renamed this mask to F81534_PORT_CONF_MODE_MASK so its more
obvious to what it applies.

Thanks,
Johan
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