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From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Subject: [RFC 1/2] serial: ns16550: get clock-frequency from dt
Date: Tue, 23 Jul 2013 19:28:01 +0400	[thread overview]
Message-ID: <1374593282-3320-2-git-send-email-antonynpavlov@gmail.com> (raw)
In-Reply-To: <1374593282-3320-1-git-send-email-antonynpavlov@gmail.com>

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>
---
 drivers/serial/serial_ns16550.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index ad3125a..6a3c865 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -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;
-- 
1.8.3.1


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  reply	other threads:[~2013-07-23 15:38 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-23 15:28 [RFC 0/2] serial: ns16550: small dt support improvements Antony Pavlov
2013-07-23 15:28 ` Antony Pavlov [this message]
2013-07-23 15:28 ` [RFC 2/2] serial: ns16550: fill cdev just-in-time Antony Pavlov
2013-07-24 16:54 ` [RFC 0/2] serial: ns16550: small dt support improvements Sascha Hauer
2013-07-25  8:28   ` Antony Pavlov

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