From: Johan Hovold <johan@kernel.org>
To: "Ji-Ze Hong \(Peter Hong\)" <hpeter@gmail.com>
Cc: johan@kernel.org, gregkh@linuxfoundation.org,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
peter_hong@fintek.com.tw,
"Ji-Ze Hong \(Peter Hong\)" <hpeter+linux_kernel@gmail.com>
Subject: [V3,2/6] usb: serial: f81534: add auto RTS direction support
Date: Thu, 11 Jan 2018 11:05:56 +0100 [thread overview]
Message-ID: <20180111100556.GA11344@localhost> (raw)
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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next reply other threads:[~2018-01-11 10:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-11 10:05 Johan Hovold [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-01-11 6:47 [V3,2/6] usb: serial: f81534: add auto RTS direction support Ji-Ze Hong (Peter Hong)
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