linux-kernel - Re: [PATCH v2 10/14] serial: pic32

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Date:	Tue, 5 Jan 2016 20:43:22 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Joshua Henderson <joshua.henderson@...rochip.com>
Cc:	<linux-kernel@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	<ralf@...ux-mips.org>,
	Andrei Pistirica <andrei.pistirica@...rochip.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>, <linux-serial@...r.kernel.org>,
	<linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 10/14] serial: pic32_uart: Add PIC32 UART driver


> +#define PIC32_SDEV_NAME		"ttyS"
> +#define PIC32_SDEV_MAJOR	TTY_MAJOR
> +#define PIC32_SDEV_MINOR	64

No. Same goes for you as every one of the forty other people a year who
try and claim their console is ttyS. If it's not an 8250 it isn't.

ttyS is the 8250, use dynamic major and minor and a different name.


> +/* serial core request to change current uart setting */
> +static void pic32_uart_set_termios(struct uart_port *port,
> +				   struct ktermios *new,
> +				   struct ktermios *old)
> +{

You need to clear any termios features requested but not supported. In
your case that appears to be CMSPAR, as you don't seem to support
mark/space parity.

Similarly if you only support 8N1 or 7E1/7O1 you need to force the CSIZE
bits to match what you ended up setting the UART to do.

> +	/* update baud */
> +	baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
> +	quot = uart_get_divisor(port, baud) - 1;
> +	pic32_uart_write(quot, sport, PIC32_UART_BRG);
> +	uart_update_timeout(port, new->c_cflag, baud);

See the 8250 driver for an example: you probably need to write back the
actual rate you got.

> +/* serial core request to release uart iomem */
> +static void pic32_uart_release_port(struct uart_port *port)
> +{
> +	struct platform_device *pdev = to_platform_device(port->dev);
> +	struct resource *res_mem;
> +	unsigned int res_size;

resource_size_t for resources. Or you could just avoid the pointless
variable in the first place 8)

Other oddments - things like kasprintf() returns should be checked


Alan
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