[U-Boot] [PATCH v4 3/4] x86: Use ePAPR defined properties for x86-uart

[Bin Meng]

Use ePAPR defined properties for x86-uart: clock-frequency and
current-speed. Assign the value of clock-frequency in device tree
to plat->clock of x86-uart instead of using hardcoded number.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
Acked-by: Simon Glass <sjg at chromium.org>

---

Changes in v4: None
Changes in v3: None
Changes in v2:
- New patch to use ePAPR defined properties for x86-uart

 arch/x86/dts/serial.dtsi    | 5 ++---
 drivers/serial/serial_x86.c | 8 +++++++-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/x86/dts/serial.dtsi b/arch/x86/dts/serial.dtsi
index ebdda76..9b097f4 100644
--- a/arch/x86/dts/serial.dtsi
+++ b/arch/x86/dts/serial.dtsi
@@ -3,8 +3,7 @@
 		compatible = "x86-uart";
 		reg = <0x3f8 8>;
 		reg-shift = <0>;
-		io-mapped = <1>;
-		multiplier = <1>;
-		baudrate = <115200>;
+		clock-frequency = <1843200>;
+		current-speed = <115200>;
 	};
 };
diff --git a/drivers/serial/serial_x86.c b/drivers/serial/serial_x86.c
index e81e035..4bf6062 100644
--- a/drivers/serial/serial_x86.c
+++ b/drivers/serial/serial_x86.c
@@ -6,9 +6,12 @@
 
 #include <common.h>
 #include <dm.h>
+#include <fdtdec.h>
 #include <ns16550.h>
 #include <serial.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 static const struct udevice_id x86_serial_ids[] = {
 	{ .compatible = "x86-uart" },
 	{ }
@@ -22,10 +25,13 @@ static int x86_serial_ofdata_to_platdata(struct udevice *dev)
 	ret = ns16550_serial_ofdata_to_platdata(dev);
 	if (ret)
 		return ret;
-	plat->clock = 1843200;
+
+	plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+				     "clock-frequency", 1843200);
 
 	return 0;
 }
+
 U_BOOT_DRIVER(serial_ns16550) = {
 	.name	= "serial_x86",
 	.id	= UCLASS_SERIAL,
-- 
1.8.2.1