[PATCH v3] serial: ns16550: Revert "Move PCI access from ofdata_to_platdata() to probe()"

[Andy Shevchenko]

The commit 720f9e1fdb0c ("Move PCI access from ofdata_to_platdata() to
probe()") while doing formally a right thing, actually brings a regression
to the drivers that would like to pre-initialize hardware before calling
ns16550_serial_probe(). In particular, the code, which gets moved out,
is responsible for getting the address of the hardware.

The commit breaks serial console on the Intel Edison, for example.

Since we are very close to the release, the quick fix is to revert the
culprit commit 720f9e1fdb0c92d3fd16e1bfc25bcbd35612675c.

Note, it doesn't affect SoCFPGA case.

Cc: Wolfgang Wallner <wolfgang.wallner at br-automation.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
---
v3: drop wrong patch, better explanation in the commit message
 drivers/serial/ns16550.c | 40 ++++++++++++----------------------------
 1 file changed, 12 insertions(+), 28 deletions(-)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index c1b303ffcb..1fcbc35015 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -479,40 +479,12 @@ static int ns16550_serial_getinfo(struct udevice *dev,
 	return 0;
 }
 
-#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
-static int ns1655_serial_set_base_addr(struct udevice *dev)
-{
-	fdt_addr_t addr;
-	struct ns16550_platdata *plat;
-
-	plat = dev_get_platdata(dev);
-
-	addr = dev_read_addr_pci(dev);
-	if (addr == FDT_ADDR_T_NONE)
-		return -EINVAL;
-
-#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
-	plat->base = addr;
-#else
-	plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
-#endif
-
-	return 0;
-}
-#endif
-
 int ns16550_serial_probe(struct udevice *dev)
 {
 	struct NS16550 *const com_port = dev_get_priv(dev);
 	struct reset_ctl_bulk reset_bulk;
 	int ret;
 
-#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
-	ret = ns1655_serial_set_base_addr(dev);
-	if (ret)
-		return ret;
-#endif
-
 	ret = reset_get_bulk(dev, &reset_bulk);
 	if (!ret)
 		reset_deassert_bulk(&reset_bulk);
@@ -535,9 +507,21 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
 {
 	struct ns16550_platdata *plat = dev->platdata;
 	const u32 port_type = dev_get_driver_data(dev);
+	fdt_addr_t addr;
 	struct clk clk;
 	int err;
 
+	/* try Processor Local Bus device first */
+	addr = dev_read_addr_pci(dev);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+#ifdef CONFIG_SYS_NS16550_PORT_MAPPED
+	plat->base = addr;
+#else
+	plat->base = (unsigned long)map_physmem(addr, 0, MAP_NOCACHE);
+#endif
+
 	plat->reg_offset = dev_read_u32_default(dev, "reg-offset", 0);
 	plat->reg_shift = dev_read_u32_default(dev, "reg-shift", 0);
 	plat->reg_width = dev_read_u32_default(dev, "reg-io-width", 1);
-- 
2.25.1