linux-kernel - Re: [PATCH 5/6] tty: serial: 8250: Add support for Moxa PCIe boards to switch interface

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Date: Sat, 8 Jun 2024 12:51:02 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Crescent Hsieh <crescentcy.hsieh@...a.com>
Cc: Jiri Slaby <jirislaby@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 5/6] tty: serial: 8250: Add support for Moxa PCIe boards
 to switch interface

Fri, Jun 07, 2024 at 07:43:35PM +0800, Crescent Hsieh kirjoitti:
> This patch adds support for Moxa PCIe serial boards to switch the serial
> interface by using ioctl() command "TIOCSRS485" with the flags of struct
> "serial_rs485":
> 
>     - RS232                  = (no flags are set)
>     - RS422                  = SER_RS485_ENABLED | SER_RS485_MODE_RS422
>     - RS485_2W (half-duplex) = SER_RS485_ENABLED
>     - RS485_4W (full-duplex) = SER_RS485_ENABLED | SER_RS485_RX_DURING_TX
> 

...

> +	if (rs485->flags & SER_RS485_ENABLED) {
> +		if (rs485->flags & SER_RS485_MODE_RS422)
> +			mode = MOXA_RS422;
> +		else if (rs485->flags & SER_RS485_RX_DURING_TX)
> +			mode = MOXA_RS485_4W;
> +		else
> +			mode = MOXA_RS485_2W;

> +	} else {
> +		if (!(pci_moxa_supported_rs(dev) & MOXA_SUPP_RS232))

	} else if ... {

> +			return -ENODEV;
> +	}

...

> +	if (pci_moxa_is_pcie(dev->device) || pci_moxa_is_mini_pcie(dev->device)) {
> +		if (pci_moxa_supported_rs(dev) & MOXA_SUPP_RS485) {

Two if:s can be replaced with if (foo && bar), but it's up to you.

> +			port->port.rs485_config = pci_moxa_rs485_config;
> +			port->port.rs485_supported = pci_moxa_rs485_supported;
> +
> +			if (!(pci_moxa_supported_rs(dev) & MOXA_SUPP_RS232))
> +				port->port.rs485.flags = SER_RS485_ENABLED | SER_RS485_MODE_RS422;
> +		}
> +	}

-- 
With Best Regards,
Andy Shevchenko