linux-kernel - Re: [PATCH] tty: serial: Add driver for MEN's 16z135 High Speed UART.

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Date:	Thu, 17 Apr 2014 14:08:28 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	Johannes Thumshirn <johannes.thumshirn@....de>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Thomas Schnuerer <thomas.schnuerer@....de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH] tty: serial: Add driver for MEN's 16z135 High Speed UART.

Thu, 17 Apr 2014 11:44:54 +0200 от Johannes Thumshirn <johannes.thumshirn@....de>:
> Add driver for MEN's 16z135 High Speed UART.
> 
> The 16z135 is a memory mapped UART Core on an MCB FPGA and has 1024 byte
> deep FIFO buffers for the RX and TX path. It also has configurable FIFO
> fill level IRQs and data copied to and from the hardware has to be
> acknowledged.
> 
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....de>
> ---
...
> +static int men_z135_probe(struct mcb_device *mdev,
> +			const struct mcb_device_id *id)
> +{
> +	struct men_z135_port *uart;
> +	struct resource *mem;
> +	struct device *dev;
> +	int err;
> +
> +	dev = &mdev->dev;
> +
> +	uart = devm_kzalloc(dev, sizeof(struct men_z135_port), GFP_KERNEL);
> +	if (!uart)
> +		return -ENOMEM;
> +
> +	uart->rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
> +	if (!uart->rxbuf)
> +		return -ENOMEM;
> +
> +	mem = &mdev->mem;
> +
> +	mcb_set_drvdata(mdev, uart);
> +
> +	uart->port.uartclk = MEN_Z135_BASECLK * 16;
> +	uart->port.fifosize = MEN_Z135_FIFO_SIZE;
> +	uart->port.iotype = UPIO_MEM;
> +	uart->port.ops = &men_z135_ops;
> +	uart->port.irq = mcb_get_irq(mdev);
> +	uart->port.iotype = UPIO_MEM;
> +	uart->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
> +	uart->port.line = line++;

So, every time a module is loaded/unloaded and loaded again,
you increase the line number?

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