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path: root/drivers/net/ethernet/ti/davinci_mdio.c
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Diffstat (limited to 'drivers/net/ethernet/ti/davinci_mdio.c')
-rw-r--r--drivers/net/ethernet/ti/davinci_mdio.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 735dc53d4b01..2791f6f2db11 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -38,6 +38,7 @@
#include <linux/davinci_emac.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_mdio.h>
#include <linux/pinctrl/consumer.h>
/*
@@ -95,6 +96,10 @@ struct davinci_mdio_data {
struct mii_bus *bus;
bool suspended;
unsigned long access_time; /* jiffies */
+ /* Indicates that driver shouldn't modify phy_mask in case
+ * if MDIO bus is registered from DT.
+ */
+ bool skip_scan;
};
static void __davinci_mdio_reset(struct davinci_mdio_data *data)
@@ -144,6 +149,9 @@ static int davinci_mdio_reset(struct mii_bus *bus)
dev_info(data->dev, "davinci mdio revision %d.%d\n",
(ver >> 8) & 0xff, ver & 0xff);
+ if (data->skip_scan)
+ return 0;
+
/* get phy mask from the alive register */
phy_mask = __raw_readl(&data->regs->alive);
if (phy_mask) {
@@ -369,8 +377,17 @@ static int davinci_mdio_probe(struct platform_device *pdev)
goto bail_out;
}
- /* register the mii bus */
- ret = mdiobus_register(data->bus);
+ /* register the mii bus
+ * Create PHYs from DT only in case if PHY child nodes are explicitly
+ * defined to support backward compatibility with DTs which assume that
+ * Davinci MDIO will always scan the bus for PHYs detection.
+ */
+ if (dev->of_node && of_get_child_count(dev->of_node)) {
+ data->skip_scan = true;
+ ret = of_mdiobus_register(data->bus, dev->of_node);
+ } else {
+ ret = mdiobus_register(data->bus);
+ }
if (ret)
goto bail_out;