On 07.08.2015 12:43, Robert Richter wrote:

On 07.08.15 10:09:04, Tomasz Nowicki wrote:

quoted

On 07.08.2015 02:33, David Daney wrote:

...

quoted

quoted

+#else
+
+static int bgx_init_acpi_phy(struct bgx *bgx)
+{
+	return -ENODEV;
+}
+
+#endif /* CONFIG_ACPI */
+
  #if IS_ENABLED(CONFIG_OF_MDIO)

  static int bgx_init_of_phy(struct bgx *bgx)

@@ -882,7 +1010,12 @@ static int bgx_init_of_phy(struct bgx *bgx)

  static int bgx_init_phy(struct bgx *bgx)
  {
-	return bgx_init_of_phy(bgx);
+	int err = bgx_init_of_phy(bgx);
+
+	if (err != -ENODEV)
+		return err;
+
+	return bgx_init_acpi_phy(bgx);
  }

If kernel can work with DT and ACPI (both compiled in), it should take only
one path instead of probing DT and ACPI sequentially. How about:

@@ -902,10 +925,9 @@ static int bgx_probe(struct pci_dev *pdev, const struct

pci_device_id *ent)
  	bgx_vnic[bgx->bgx_id] = bgx;
  	bgx_get_qlm_mode(bgx);

-	snprintf(bgx_sel, 5, "bgx%d", bgx->bgx_id);
-	np = of_find_node_by_name(NULL, bgx_sel);
-	if (np)
-		bgx_init_of(bgx, np);
+	err = acpi_disabled ? bgx_init_of_phy(bgx) : bgx_init_acpi_phy(bgx);
+	if (err)
+		goto err_enable;

  	bgx_init_hw(bgx);

I would not pollute bgx_probe() with acpi and dt specifics, and instead
keep bgx_init_phy(). The typical design pattern for this is:

static int bgx_init_phy(struct bgx *bgx)
{
#ifdef CONFIG_ACPI
         if (!acpi_disabled)
                 return bgx_init_acpi_phy(bgx);
#endif
         return bgx_init_of_phy(bgx);
}

This adds acpi runtime detection (acpi=no), does not call dt code in
case of acpi, and saves the #else for bgx_init_acpi_phy().

I am fine with keeping it in bgx_init_phy(), however we can drop there 
#ifdefs since both of bgx_init_{acpi,of}_phy calls have empty stub for 
!ACPI and !OF case. Like that:

static int bgx_init_phy(struct bgx *bgx)
{

         if (!acpi_disabled)
                 return bgx_init_acpi_phy(bgx);
	else
         	return bgx_init_of_phy(bgx);
}

Tomasz