linux-kernel - [RFC PATCH net-next v3 12/15] net: dsa: mt7530: add support for single-chip reset line

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Date:   Wed, 29 Mar 2023 17:00:06 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Sam Shih <Sam.Shih@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>
Subject: [RFC PATCH net-next v3 12/15] net: dsa: mt7530: add support for
 single-chip reset line

Similar to multi-chip-module MT7530 also MT7988 uses an internal
reset line instead of using an optional reset GPIO like it is the
case for external MT7530 and MT7531 ICs.
Add support for internal but non-MCM reset line in preparation for
adding support for MT7988.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/dsa/mt7530.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index c6fad2d156160..fd55ddc2d1eb3 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -3066,6 +3066,12 @@ mt7530_probe_common(struct mt7530_priv *priv)
 			dev_err(dev, "Couldn't get our reset line\n");
 			return PTR_ERR(priv->rstc);
 		}
+	} else if (!priv->bus) {
+		priv->rstc = devm_reset_control_get(dev, NULL);
+		if (IS_ERR(priv->rstc)) {
+			dev_err(dev, "Couldn't get our reset line\n");
+			return PTR_ERR(priv->rstc);
+		}
 	} else {
 		priv->reset = devm_gpiod_get_optional(dev, "reset",
 						      GPIOD_OUT_LOW);
-- 
2.39.2