linux-kernel - [PATCH net-next v2 4/7] net: dsa: b53: mmap: Add syscon reference and register layout for bcm63268

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Message-ID: <20250724035300.20497-5-kylehendrydev@gmail.com>
Date: Wed, 23 Jul 2025 20:52:43 -0700
From: Kyle Hendry <kylehendrydev@...il.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>,
	Andrew Lunn <andrew@...n.ch>,
	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>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Russell King <linux@...linux.org.uk>
Cc: noltari@...il.com,
	jonas.gorski@...il.com,
	Kyle Hendry <kylehendrydev@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 4/7] net: dsa: b53: mmap: Add syscon reference and register layout for bcm63268

On bcm63xx SoCs there are registers that control the PHYs in
the GPIO controller. Allow the b53 driver to access them
by passing in the syscon through the device tree.

Add a structure to describe the ephy control register
and add register info for bcm63268.

Signed-off-by: Kyle Hendry <kylehendrydev@...il.com>
---
 drivers/net/dsa/b53/b53_mmap.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/net/dsa/b53/b53_mmap.c b/drivers/net/dsa/b53/b53_mmap.c
index f97556c6ca2a..35bf39ab2771 100644
--- a/drivers/net/dsa/b53/b53_mmap.c
+++ b/drivers/net/dsa/b53/b53_mmap.c
@@ -21,13 +21,32 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/io.h>
+#include <linux/mfd/syscon.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/b53.h>
 
 #include "b53_priv.h"
 
+struct b53_phy_info {
+	u32 ephy_enable_mask;
+	u32 ephy_port_mask;
+	u32 ephy_bias_bit;
+	const u32 *ephy_offset;
+};
+
 struct b53_mmap_priv {
 	void __iomem *regs;
+	struct regmap *gpio_ctrl;
+	const struct b53_phy_info *phy_info;
+};
+
+static const u32 bcm63268_ephy_offsets[] = {4, 9, 14};
+
+static const struct b53_phy_info bcm63268_ephy_info = {
+	.ephy_enable_mask = GENMASK(4, 0),
+	.ephy_port_mask = GENMASK((ARRAY_SIZE(bcm63268_ephy_offsets) - 1), 0),
+	.ephy_bias_bit = 24,
+	.ephy_offset = bcm63268_ephy_offsets,
 };
 
 static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
@@ -313,6 +332,12 @@ static int b53_mmap_probe(struct platform_device *pdev)
 
 	priv->regs = pdata->regs;
 
+	priv->gpio_ctrl = syscon_regmap_lookup_by_phandle(np, "brcm,gpio-ctrl");
+	if (!IS_ERR(priv->gpio_ctrl)) {
+		if (pdata->chip_id == BCM63268_DEVICE_ID)
+			priv->phy_info = &bcm63268_ephy_info;
+	}
+
 	dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv);
 	if (!dev)
 		return -ENOMEM;
-- 
2.43.0