linux-kernel - [PATCH v2 2/5] net: cadence: macb: Expose REFCLK as a device tree property

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Message-ID: <7f9b65896d6b7b48275bc527b72a16347f8ce10a.1752510727.git.Ryan.Wanner@microchip.com>
Date: Mon, 14 Jul 2025 09:37:00 -0700
From: <Ryan.Wanner@...rochip.com>
To: <andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
	<alexandre.belloni@...tlin.com>, <claudiu.beznea@...on.dev>
CC: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, "Ryan
 Wanner" <Ryan.Wanner@...rochip.com>
Subject: [PATCH v2 2/5] net: cadence: macb: Expose REFCLK as a device tree property

From: Ryan Wanner <Ryan.Wanner@...rochip.com>

The RMII and RGMII can both support internal or external provided
REFCLKs 50MHz and 125MHz respectively. Since this is dependent on
the board that the SoC is on this needs to be set via the device tree.

This property flag is checked in the MACB DT node so the REFCLK cap is
configured the correct way for the RMII or RGMII is configured on the
board.

Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index d1f1ae5ea161..9ebe1062b359 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -4109,8 +4109,12 @@ static const struct net_device_ops macb_netdev_ops = {
 static void macb_configure_caps(struct macb *bp,
 				const struct macb_config *dt_conf)
 {
+	struct device_node *np = bp->pdev->dev.of_node;
+	bool refclk_ext;
 	u32 dcfg;
 
+	refclk_ext = of_property_read_bool(np, "cdns,refclk-ext");
+
 	if (dt_conf)
 		bp->caps = dt_conf->caps;
 
@@ -4141,6 +4145,9 @@ static void macb_configure_caps(struct macb *bp,
 		}
 	}
 
+	if (refclk_ext)
+		bp->caps |= MACB_CAPS_USRIO_HAS_CLKEN;
+
 	dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
 }
 
-- 
2.43.0