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serial: ns16550: get clock-frequency from dt 

This patch helps clk-less boards to use device
tree for clock frequency probing (taken from
linux.git/drivers/tty/serial/of_serial.c).

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Antony Pavlov 2013-07-23 19:28:01 +04:00 committed by Sascha Hauer
parent c841e7a262
commit fe290ec08f
1 changed files with 6 additions and 0 deletions
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6
drivers/serial/serial_ns16550.c
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@ -277,6 +277,12 @@ static int ns16550_probe(struct device_d *dev)
priv->plat.clock = clk_get_rate(priv->clk);
}
if (priv->plat.clock == 0 && IS_ENABLED(CONFIG_OFDEVICE)) {
struct device_node *np = dev->device_node;
of_property_read_u32(np, "clock-frequency", &priv->plat.clock);
}
if (priv->plat.clock == 0) {
dev_err(dev, "no valid clockrate\n");
ret = -EINVAL;