netdev - [PATCH net-next v3 2/2] net: dsa: microchip: Add property to disable reference clock

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Message-Id: <20220127003318.3633212-3-robert.hancock@calian.com>
Date:   Wed, 26 Jan 2022 18:33:18 -0600
From:   Robert Hancock <robert.hancock@...ian.com>
To:     netdev@...r.kernel.org
Cc:     woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, kuba@...nel.org,
        robh+dt@...nel.org, marex@...x.de, devicetree@...r.kernel.org,
        Robert Hancock <robert.hancock@...ian.com>
Subject: [PATCH net-next v3 2/2] net: dsa: microchip: Add property to disable reference clock

Add a new microchip,synclko-disable property which can be specified
to disable the reference clock output from the device if not required
by the board design.

Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
---
 drivers/net/dsa/microchip/ksz9477.c    | 7 ++++++-
 drivers/net/dsa/microchip/ksz_common.c | 6 ++++++
 drivers/net/dsa/microchip/ksz_common.h | 1 +
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 353b5f981740..33d52050cd68 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -222,9 +222,14 @@ static int ksz9477_reset_switch(struct ksz_device *dev)
 			   (BROADCAST_STORM_VALUE *
 			   BROADCAST_STORM_PROT_RATE) / 100);
 
-	if (dev->synclko_125)
+	if (dev->synclko_disable)
+		ksz_write8(dev, REG_SW_GLOBAL_OUTPUT_CTRL__1, 0);
+	else if (dev->synclko_125)
 		ksz_write8(dev, REG_SW_GLOBAL_OUTPUT_CTRL__1,
 			   SW_ENABLE_REFCLKO | SW_REFCLKO_IS_125MHZ);
+	else
+		ksz_write8(dev, REG_SW_GLOBAL_OUTPUT_CTRL__1,
+			   SW_ENABLE_REFCLKO);
 
 	return 0;
 }
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 55dbda04ea62..7e33ec73f803 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -434,6 +434,12 @@ int ksz_switch_register(struct ksz_device *dev,
 			}
 		dev->synclko_125 = of_property_read_bool(dev->dev->of_node,
 							 "microchip,synclko-125");
+		dev->synclko_disable = of_property_read_bool(dev->dev->of_node,
+							     "microchip,synclko-disable");
+		if (dev->synclko_125 && dev->synclko_disable) {
+			dev_err(dev->dev, "inconsistent synclko settings\n");
+			return -EINVAL;
+		}
 	}
 
 	ret = dsa_register_switch(dev->ds);
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index df8ae59c8525..3db63f62f0a1 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -75,6 +75,7 @@ struct ksz_device {
 	u32 regs_size;
 	bool phy_errata_9477;
 	bool synclko_125;
+	bool synclko_disable;
 
 	struct vlan_table *vlan_cache;
 
-- 
2.31.1