[3/3] serial: 8250_omap: Use clk_get_rate() to obtain fclk frequency
diff mbox series

Message ID 20190109091206.25759-4-vigneshr@ti.com
State New
Headers show
Series
  • 8250_omap: use clk APIs to get fclk freqeuncy
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Commit Message

Vignesh Raghavendra Jan. 9, 2019, 9:12 a.m. UTC
8250_omap driver uses clock-frequency DT property to obtain functional
clk frequency. This is not ideal as users need to calculate functional
clk frequency offline and populate it in DT.
Therefore add support to obtain functional clock frequency using clk
APIs when clock-frequency DT property is not defined.

Suggested-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
---
 drivers/tty/serial/8250/8250_omap.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

Patch
diff mbox series

diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index a74126569785..0a8316632d75 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -12,6 +12,7 @@ 
 #define SUPPORT_SYSRQ
 #endif
 
+#include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -1203,7 +1204,18 @@  static int omap8250_probe(struct platform_device *pdev)
 	}
 	up.port.line = ret;
 
-	of_property_read_u32(np, "clock-frequency", &up.port.uartclk);
+	if (of_property_read_u32(np, "clock-frequency", &up.port.uartclk)) {
+		struct clk *clk;
+
+		clk = devm_clk_get(&pdev->dev, NULL);
+		if (IS_ERR(clk)) {
+			if (PTR_ERR(clk) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
+		} else {
+			up.port.uartclk = clk_get_rate(clk);
+		}
+	}
+
 	priv->wakeirq = irq_of_parse_and_map(np, 1);
 
 	id = of_match_device(of_match_ptr(omap8250_dt_ids), &pdev->dev);