linux-kernel - [PATCH net v1 1/1] net: dsa: microchip: KSZ9893: do not write to not supported Output Clock Control Register

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Message-Id: <20220728131852.41518-1-o.rempel@pengutronix.de>
Date:   Thu, 28 Jul 2022 15:18:52 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.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>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net v1 1/1] net: dsa: microchip: KSZ9893: do not write to not supported Output Clock Control Register

KSZ9893 compatible chips do not have "Output Clock Control Register 0x0103".
So, avoid writing to it.

Fixes: 462d525018f0 ("net: dsa: microchip: move ksz_chip_data to ksz_common")
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/dsa/microchip/ksz9477.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 5dff6c3279bb..c73bb6d383ad 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -198,6 +198,10 @@ int ksz9477_reset_switch(struct ksz_device *dev)
 	ksz_write32(dev, REG_SW_PORT_INT_MASK__4, 0x7F);
 	ksz_read32(dev, REG_SW_PORT_INT_STATUS__4, &data32);
 
+	/* KSZ9893 compatible chips do not support refclk configuration */
+	if (dev->chip_id == KSZ9893_CHIP_ID)
+		return 0;
+
 	data8 = SW_ENABLE_REFCLKO;
 	if (dev->synclko_disable)
 		data8 = 0;
-- 
2.30.2