linux-kernel - [PATCH 4/4] net: dsa: b53: mdio: Add optional reset gpio

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Message-ID: <AM0PR02MB5524BDEBE80C82BC689C3DD6BDAF9@AM0PR02MB5524.eurprd02.prod.outlook.com>
Date:   Mon, 27 Feb 2023 19:44:09 +0000
From:   Paul Geurts <paul.geurts@...drive-technologies.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/4] net: dsa: b53: mdio: Add optional reset gpio

Some Broadcom Ethernet switch devices feature a reset pin driven by GPIO.
Provide the option to specify a reset gpio.

Signed-off-by: Paul Geurts <paul.geurts@...drive-technologies.com>
---
 drivers/net/dsa/b53/b53_mdio.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_mdio.c b/drivers/net/dsa/b53/b53_mdio.c index 8b422b298cd5..32af5881834c 100644
--- a/drivers/net/dsa/b53/b53_mdio.c
+++ b/drivers/net/dsa/b53/b53_mdio.c
@@ -22,6 +22,7 @@
 #include <linux/delay.h>
 #include <linux/brcmphy.h>
 #include <linux/rtnetlink.h>
+#include <linux/gpio/consumer.h>
 #include <net/dsa.h>
 
 #include "b53_priv.h"
@@ -303,6 +304,14 @@ static int b53_mdio_probe(struct mdio_device *mdiodev)
 		return -ENODEV;
 	}
 
+	/* Try to get a reset GPIO and get the switch out of reset when its there */
+	mdiodev->reset_gpio = devm_gpiod_get_optional(&mdiodev->dev, "reset", GPIOD_OUT_HIGH);
+	if (mdiodev->reset_gpio) {
+		mdelay(50);
+		gpiod_set_value(mdiodev->reset_gpio, 0);
+		mdelay(50);
+	}
+
 	/* read the first port's id */
 	phy_id = mdiobus_read(mdiodev->bus, 0, 2) << 16;
 	phy_id |= mdiobus_read(mdiodev->bus, 0, 3);
--
2.30.2