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serial: sa1100: add note about modem control signals
As suggested by Uwe, add a note indicating that the modem control signals do not support interrupts, which precludes the driver from using mctrl_gpio_init(). Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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@ -860,6 +860,10 @@ static int sa1100_serial_resume(struct platform_device *dev)
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static int sa1100_serial_add_one_port(struct sa1100_port *sport, struct platform_device *dev)
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{
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sport->port.dev = &dev->dev;
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// mctrl_gpio_init() requires that the GPIO driver supports interrupts,
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// but we need to support GPIO drivers for hardware that has no such
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// interrupts. Use mctrl_gpio_init_noauto() instead.
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sport->gpios = mctrl_gpio_init_noauto(sport->port.dev, 0);
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if (IS_ERR(sport->gpios)) {
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int err = PTR_ERR(sport->gpios);
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