netdev - [PATCH 2/2] net: davinci_mdio: allow to create phys from dt

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 9 Jul 2014 16:10:51 +0300
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	<santosh.shilimkar@...com>, <netdev@...r.kernel.org>
CC:	<prabhakar.csengg@...il.com>, Sekhar Nori <nsekhar@...com>,
	Rob Herring <robh+dt@...nel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Grygorii Strashko <grygorii.strashko@...com>
Subject: [PATCH 2/2] net: davinci_mdio: allow to create phys from dt

This patch allows to create PHYs from DT in case
if they are explicitly defined. The of_mdiobus_register() is
used for such purposes.

For backward compatibility, call  of_mdiobus_register() only in case
if at least one PHY's child is defined in DT, otherwise rollback to
mdiobus_register().

Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
---
 drivers/net/ethernet/ti/davinci_mdio.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 735dc53..22d3dab 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 +96,7 @@ struct davinci_mdio_data {
 	struct mii_bus	*bus;
 	bool		suspended;
 	unsigned long	access_time; /* jiffies */
+	bool		skip_scan;
 };
 
 static void __davinci_mdio_reset(struct davinci_mdio_data *data)
@@ -144,6 +146,9 @@ 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 +374,17 @@ 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;
 
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html