serial: fdt: add device tree support for pl01x

This patch adds device tree support for arm pl010/pl011 driver.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
Acked-by: Simon Glass <sjg@chromium.org>

doc/device-tree-bindings/serial/pl01x.txt

+* ARM AMBA Primecell PL011 & PL010 serial UART
+
+Required properties:
+- compatible: must be "arm,primecell", "arm,pl011" or "arm,pl010"
+- reg: exactly one register range with length 0x1000
+- clock: input clock frequency for the UART (used to calculate the baud
+  rate divisor)

drivers/serial/serial_pl01x.c

@@ -20,6 +20,9 @@
 #include <dm/platform_data/serial_pl01x.h>
 #include <linux/compiler.h>
 #include "serial_pl01x_internal.h"
+#include <fdtdec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
 
 #ifndef CONFIG_DM_SERIAL
 
@@ -28,7 +31,6 @@ static enum pl01x_type pl01x_type __attribute__ ((section(".data")));
 static struct pl01x_regs *base_regs __attribute__ ((section(".data")));
 #define NUM_PORTS (sizeof(port)/sizeof(port[0]))
 
-DECLARE_GLOBAL_DATA_PTR;
 #endif
 
 static int pl01x_putc(struct pl01x_regs *regs, char c)
@@ -351,9 +353,35 @@ static const struct dm_serial_ops pl01x_serial_ops = {
 	.setbrg = pl01x_serial_setbrg,
 };
 
+#ifdef CONFIG_OF_CONTROL
+static const struct udevice_id pl01x_serial_id[] ={
+	{.compatible = "arm,pl011", .data = TYPE_PL011},
+	{.compatible = "arm,pl010", .data = TYPE_PL010},
+	{}
+};
+
+static int pl01x_serial_ofdata_to_platdata(struct udevice *dev)
+{
+	struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
+	fdt_addr_t addr;
+
+	addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	plat->base = addr;
+	plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "clock", 1);
+	plat->type = dev_get_driver_data(dev);
+	return 0;
+}
+#endif
+
 U_BOOT_DRIVER(serial_pl01x) = {
 	.name	= "serial_pl01x",
 	.id	= UCLASS_SERIAL,
+	.of_match = of_match_ptr(pl01x_serial_id),
+	.ofdata_to_platdata = of_match_ptr(pl01x_serial_ofdata_to_platdata),
+	.platdata_auto_alloc_size = sizeof(struct pl01x_serial_platdata),
 	.probe = pl01x_serial_probe,
 	.ops	= &pl01x_serial_ops,
 	.flags = DM_FLAG_PRE_RELOC,