linux-kernel - [PATCH 3/3] net: lan966x: make reset optional

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Message-Id: <20220826115607.1148489-4-michael@walle.cc>
Date:   Fri, 26 Aug 2022 13:56:07 +0200
From:   Michael Walle <michael@...le.cc>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Michael Walle <michael@...le.cc>
Subject: [PATCH 3/3] net: lan966x: make reset optional

There is no dedicated reset for just the switch core. The reset which
is used up until now, is more of a global reset, resetting almost the
whole SoC and cause spurious errors by doing so. Make it possible to
handle the reset elsewhere and mark the reset as optional.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index 2ad078608c45..e2c77f954a3d 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -971,7 +971,8 @@ static int lan966x_reset_switch(struct lan966x *lan966x)
 	int val = 0;
 	int ret;
 
-	switch_reset = devm_reset_control_get_shared(lan966x->dev, "switch");
+	switch_reset = devm_reset_control_get_optional_shared(lan966x->dev,
+							      "switch");
 	if (IS_ERR(switch_reset))
 		return dev_err_probe(lan966x->dev, PTR_ERR(switch_reset),
 				     "Could not obtain switch reset");
-- 
2.30.2