linux-kernel - Re: [PATCH v2 tty-next 2/3] 8250: microchip: pci1xxxx: Add rs485 support to quad-uart driver.

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Date:   Mon, 3 Oct 2022 12:20:47 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, andy.shevchenko@...il.com,
        u.kleine-koenig@...gutronix.de, johan@...nel.org,
        wander@...hat.com, etremblay@...tech-controls.com,
        macro@...am.me.uk, geert+renesas@...der.be, jk@...abs.org,
        phil.edworthy@...esas.com, Lukas Wunner <lukas@...ner.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v2 tty-next 2/3] 8250: microchip: pci1xxxx: Add rs485
 support to quad-uart driver.

On Sat, 1 Oct 2022, Kumaravel Thiagarajan wrote:

> pci1xxxx uart supports rs485 mode of operation in the hardware with
> auto-direction control with configurable delay for releasing RTS after
> the transmission. This patch adds support for the rs485 mode.
> 
> Signed-off-by: Kumaravel Thiagarajan <kumaravel.thiagarajan@...rochip.com>
> ---
> Changes in v2:
> - move pci1xxxx_rs485_config to a separate patch with
>   pci1xxxx_rs485_supported.
> ---
>  drivers/tty/serial/8250/8250_pci1xxxx.c | 57 +++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/drivers/tty/serial/8250/8250_pci1xxxx.c b/drivers/tty/serial/8250/8250_pci1xxxx.c
> index 41a4b94f52b4..999e5a284266 100644
> --- a/drivers/tty/serial/8250/8250_pci1xxxx.c
> +++ b/drivers/tty/serial/8250/8250_pci1xxxx.c
> +
> +		if (rs485->delay_rts_after_send) {
> +			baud_period_in_ns = ((clock_div >> 8) * 16);

Is this 16 perhaps UART_BIT_SAMPLE_CNT?


-- 
 i.