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

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Date:	Wed, 6 Jan 2016 22:00:43 +0000
From:	<Paul.Thacker@...rochip.com>
To:	<gnomes@...rguk.ukuu.org.uk>, <Joshua.Henderson@...rochip.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	<ralf@...ux-mips.org>, <Andrei.Pistirica@...rochip.com>,
	<gregkh@...uxfoundation.org>, <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

On 01/05/2016 03:50 PM, One Thousand Gnomes wrote:
>
>> +#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.

Ok. Is there a naming convention documented anywhere? How about ttyPIC?

>
>
>> +/* 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.

Ack.

>
> 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.

Ack.

>
>> +	/* 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.

Ack.

>
>> +/* 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)

Pointless variable removed.

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

Ack.

>
>
> Alan

Thanks,
Paul

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