linux-kernel - Re: [PATCH] modify pl011 driver to let it work as wakeup source

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Date:	Thu, 17 Sep 2015 11:31:26 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Zhaoyang Huang <zhaoyang.huang@...aro.org>
Cc:	linux-pm@...r.kernel.org, gregkh@...uxfoundation.org,
	jslaby@...e.com, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, amit.kucheria@...aro.org,
	sudeep.holla@....com, daniel.lezcano@...aro.org
Subject: Re: [PATCH] modify pl011 driver to let it work as wakeup source

On Thu, Sep 17, 2015 at 04:31:56PM +0800, Zhaoyang Huang wrote:
> +struct uart_match {
> +	struct uart_port *port;
> +	struct uart_driver *driver;
> +};
> +
> +static int match_uart_port(struct device *dev, void *data)
> +{
> +	struct uart_match *match = data;
> +
> +	dev_t devt = MKDEV(match->driver->major, match->driver->minor) +
> +		match->port->line;
> +
> +	pr_info("the match data of ttyAMA0 is %d %d\n",
> +			(int)devt, (int)dev->devt);
> +
> +	return dev->devt == devt; /* Actually, only one tty per port */
> +}
...
> +	ret = pl011_register_port(uap);
> +
> +	if (!of_find_property(dev->dev.of_node, "linux,wakeup", NULL)) {
> +		uart_dev = NULL;
> +		return ret;
> +	}
> +
> +	match.port = &uap->port;
> +	match.driver = &amba_reg;
> +
> +	uart_dev = device_find_child(&dev->dev, &match, match_uart_port);
> +
> +	if (uart_dev) {
> +		device_init_wakeup(uart_dev, true);
> +		dev_pm_set_wake_irq(uart_dev, uap->port.irq);
> +	}
> +
> +	return ret;

I can only describe this code as a hack.  This looks like something
which should be handled by generic infrastructure at an appropriate
point (somewhere inside uart_add_one_port()), not by hacky code in
each driver.

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