netdev - [PATCH net-next v1 3/3] net: phy: micrel: add coma mode GPIO

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Date:   Wed, 27 Apr 2022 23:44:06 +0200
From:   Michael Walle <michael@...le.cc>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Michael Walle <michael@...le.cc>
Subject: [PATCH net-next v1 3/3] net: phy: micrel: add coma mode GPIO

The LAN8814 has a coma mode pin which puts the PHY into isolate and
power-dowm mode. Unfortunately, the mode cannot be disabled by a
register. Usually, the input pin has a pull-up and connected to a GPIO
which can then be used to disable the mode. Try to get the GPIO and
deassert it.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/net/phy/micrel.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index b981c5eaac33..685a0ab5453c 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -32,6 +32,7 @@
 #include <linux/ptp_clock.h>
 #include <linux/ptp_classify.h>
 #include <linux/net_tstamp.h>
+#include <linux/gpio/consumer.h>
 
 /* Operation Mode Strap Override */
 #define MII_KSZPHY_OMSO				0x16
@@ -2837,6 +2838,21 @@ static int lan8814_config_init(struct phy_device *phydev)
 	return 0;
 }
 
+static int lan8814_release_coma_mode(struct phy_device *phydev)
+{
+	struct gpio_desc *gpiod;
+
+	gpiod = devm_gpiod_get_optional(&phydev->mdio.dev, "coma-mode",
+					GPIOD_OUT_HIGH_OPEN_DRAIN);
+	if (IS_ERR(gpiod))
+		return PTR_ERR(gpiod);
+
+	gpiod_set_consumer_name(gpiod, "LAN8814 coma mode");
+	gpiod_set_value_cansleep(gpiod, 0);
+
+	return 0;
+}
+
 static int lan8814_probe(struct phy_device *phydev)
 {
 	struct kszphy_priv *priv;
@@ -2859,6 +2875,10 @@ static int lan8814_probe(struct phy_device *phydev)
 			      addr, sizeof(struct lan8814_shared_priv));
 
 	if (phy_package_init_once(phydev)) {
+		err = lan8814_release_coma_mode(phydev);
+		if (err)
+			return err;
+
 		err = lan8814_ptp_probe_once(phydev);
 		if (err)
 			return err;
-- 
2.30.2