linux-kernel - [PATCH net-next v4 08/17] net: dsa: microchip: KSZ9893: do not write to not supported Output Clock Control Register

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Message-Id: <20220826105634.3855578-9-o.rempel@pengutronix.de>
Date:   Fri, 26 Aug 2022 12:56:25 +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-next v4 08/17] net: dsa: microchip: KSZ9893: do not write to not supported Output Clock Control Register

This issue was detected after adding regmap register access validation.
KSZ9893 compatible chips do not have "Output Clock Control Register
0x0103". So, avoid writing to it.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
Reviewed-by: Vladimir Oltean <olteanv@...il.com>
---
 drivers/net/dsa/microchip/ksz9477.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index f60ceaf25a66c..fb9de6b447b12 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -193,6 +193,11 @@ 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 ||
+	    dev->chip_id == KSZ8563_CHIP_ID)
+		return 0;
+
 	data8 = SW_ENABLE_REFCLKO;
 	if (dev->synclko_disable)
 		data8 = 0;
-- 
2.30.2