linux-kernel - [PATCH v1] net: fec: optionally reset PHY via a reset-controller

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Date:   Mon, 15 Jul 2019 17:05:12 -0400
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Fugang Duan <fugang.duan@....com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] net: fec: optionally reset PHY via a reset-controller

The current fec driver allows the PHY to be reset via a gpio,
specified in the devicetree. However, some PHYs need to be reset
in a more complex way.

To accommodate such PHYs, allow an optional reset controller
in the fec devicetree. If no reset controller is found, the
fec will fall back to the legacy reset behaviour.

Example:
&fec {
	phy-mode = "rgmii";
	resets = <&phy_reset>;
	reset-names = "phy";
	status = "okay";
};

Signed-off-by: Sven Van Asbroeck <TheSven73@...il.com>
---

Will send a Documentation patch if this receives a positive review.

 drivers/net/ethernet/freescale/fec_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 38f10f7dcbc3..5a5f3ed6f16d 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -61,6 +61,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/if_vlan.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/reset.h>
 #include <linux/prefetch.h>
 #include <soc/imx/cpuidle.h>
 
@@ -3335,6 +3336,7 @@ static int fec_enet_get_irq_cnt(struct platform_device *pdev)
 static int
 fec_probe(struct platform_device *pdev)
 {
+	struct reset_control *phy_reset;
 	struct fec_enet_private *fep;
 	struct fec_platform_data *pdata;
 	struct net_device *ndev;
@@ -3490,7 +3492,9 @@ fec_probe(struct platform_device *pdev)
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-	ret = fec_reset_phy(pdev);
+	phy_reset = devm_reset_control_get_exclusive(&pdev->dev, "phy");
+	ret = IS_ERR(phy_reset) ? fec_reset_phy(pdev) :
+			reset_control_reset(phy_reset);
 	if (ret)
 		goto failed_reset;
 
-- 
2.17.1