netdev - [RFC v1 1/3] net: dsa: mt753x: make reset optional

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Message-Id: <20220426134924.30372-2-linux@fw-web.de>
Date:   Tue, 26 Apr 2022 15:49:22 +0200
From:   Frank Wunderlich <linux@...web.de>
To:     linux-mediatek@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Cc:     Frank Wunderlich <frank-w@...lic-files.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Peter Geis <pgwipeout@...il.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [RFC v1 1/3] net: dsa: mt753x: make reset optional

From: Frank Wunderlich <frank-w@...lic-files.de>

Currently a reset line is required, but on BPI-R2-Pro board
this reset is shared with the gmac and prevents the switch to
be initialized because mdio is not ready fast enough after
the reset.

So make the reset optional to allow shared reset lines.

Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
---
 drivers/net/dsa/mt7530.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 19f0035d4410..ccf4cb944167 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2134,7 +2134,7 @@ mt7530_setup(struct dsa_switch *ds)
 		reset_control_assert(priv->rstc);
 		usleep_range(1000, 1100);
 		reset_control_deassert(priv->rstc);
-	} else {
+	} else if (priv->reset) {
 		gpiod_set_value_cansleep(priv->reset, 0);
 		usleep_range(1000, 1100);
 		gpiod_set_value_cansleep(priv->reset, 1);
@@ -2276,7 +2276,7 @@ mt7531_setup(struct dsa_switch *ds)
 		reset_control_assert(priv->rstc);
 		usleep_range(1000, 1100);
 		reset_control_deassert(priv->rstc);
-	} else {
+	} else if (priv->reset) {
 		gpiod_set_value_cansleep(priv->reset, 0);
 		usleep_range(1000, 1100);
 		gpiod_set_value_cansleep(priv->reset, 1);
@@ -3272,8 +3272,7 @@ mt7530_probe(struct mdio_device *mdiodev)
 		priv->reset = devm_gpiod_get_optional(&mdiodev->dev, "reset",
 						      GPIOD_OUT_LOW);
 		if (IS_ERR(priv->reset)) {
-			dev_err(&mdiodev->dev, "Couldn't get our reset line\n");
-			return PTR_ERR(priv->reset);
+			dev_warn(&mdiodev->dev, "Couldn't get our reset line\n");
 		}
 	}
 
-- 
2.25.1