linux-kernel - [PATCH v2 06/21] reset: rzv2h-usb2phy: Add support for VBUS mux controller registration

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Message-ID: <39923e450f1ce220cbca28dcf6b215dd9fa79dde.1762354366.git.tommaso.merciai.xr@bp.renesas.com>
Date: Wed,  5 Nov 2025 16:39:02 +0100
From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
To: tomm.merciai@...il.com
Cc: linux-renesas-soc@...r.kernel.org,
	biju.das.jz@...renesas.com,
	Tommaso Merciai <tommaso.merciai.xr@...renesas.com>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Peter Rosin <peda@...ntia.se>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 06/21] reset: rzv2h-usb2phy: Add support for VBUS mux controller registration

The RZ/V2H USB2 PHY requires control of the VBUS selection line
(VBENCTL) through a mux controller described in the device tree as
"mux-controller". This change adds support for registering
vbus-sel-mux auxiliary driver during probe.

This enables proper management of USB2.0 VBUS source selection on
platforms using the RZ/V2H SoC.

Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
---
v1->v2:
 - New patch

 drivers/reset/Kconfig               |  1 +
 drivers/reset/reset-rzv2h-usb2phy.c | 65 +++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index e1ae624661f3..f54e216ca7f6 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -255,6 +255,7 @@ config RESET_RZG2L_USBPHY_CTRL
 config RESET_RZV2H_USB2PHY
 	tristate "Renesas RZ/V2H(P) (and similar SoCs) USB2PHY Reset driver"
 	depends on ARCH_RENESAS || COMPILE_TEST
+	select AUXILIARY_BUS
 	help
 	  Support for USB2PHY Port reset Control found on the RZ/V2H(P) SoC
 	  (and similar SoCs).
diff --git a/drivers/reset/reset-rzv2h-usb2phy.c b/drivers/reset/reset-rzv2h-usb2phy.c
index 5bdd39274612..6074aa8cc13a 100644
--- a/drivers/reset/reset-rzv2h-usb2phy.c
+++ b/drivers/reset/reset-rzv2h-usb2phy.c
@@ -5,8 +5,10 @@
  * Copyright (C) 2025 Renesas Electronics Corporation
  */
 
+#include <linux/auxiliary_bus.h>
 #include <linux/cleanup.h>
 #include <linux/delay.h>
+#include <linux/idr.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -14,6 +16,9 @@
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/reset-controller.h>
+#include <linux/reset/reset_rzv2h_usb2phy.h>
+
+static DEFINE_IDA(auxiliary_ids);
 
 struct rzv2h_usb2phy_regval {
 	u16 reg;
@@ -104,6 +109,62 @@ static int rzv2h_usb2phy_reset_of_xlate(struct reset_controller_dev *rcdev,
 	return 0;
 }
 
+static void rzv2h_usb2phy_reset_adev_unregister(void *data)
+{
+	struct auxiliary_device *adev = data;
+
+	auxiliary_device_delete(adev);
+	auxiliary_device_uninit(adev);
+}
+
+static void rzv2h_usb2phy_reset_adev_release(struct device *dev)
+{
+	struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+	ida_free(&auxiliary_ids, adev->id);
+}
+
+static int rzv2h_usb2phy_reset_mux_register(struct device *dev,
+					    void __iomem *base,
+					    const char *mux_name)
+{
+	struct reset_rzv2h_usb2phy_adev *rdev;
+	struct auxiliary_device *adev;
+	int ret;
+
+	rdev = devm_kzalloc(dev, sizeof(*rdev), GFP_KERNEL);
+	if (!rdev)
+		return -ENOMEM;
+
+	rdev->base = base;
+
+	adev = &rdev->adev;
+	adev->name = mux_name;
+	adev->dev.parent = dev->parent;
+	adev->dev.release = rzv2h_usb2phy_reset_adev_release;
+	adev->dev.of_node = dev->of_node;
+	ret = ida_alloc(&auxiliary_ids, GFP_KERNEL);
+	if (ret < 0)
+		return ret;
+	adev->id = ret;
+
+	ret = auxiliary_device_init(adev);
+	if (ret)
+		goto cleanup_ida;
+
+	ret = auxiliary_device_add(adev);
+	if (ret) {
+		auxiliary_device_uninit(adev);
+		goto cleanup_ida;
+	}
+
+	return devm_add_action_or_reset(dev, rzv2h_usb2phy_reset_adev_unregister, adev);
+
+cleanup_ida:
+	ida_free(&auxiliary_ids, adev->id);
+	return ret;
+}
+
 static void rzv2h_usb2phy_reset_pm_runtime_put(void *data)
 {
 	pm_runtime_put(data);
@@ -162,6 +223,10 @@ static int rzv2h_usb2phy_reset_probe(struct platform_device *pdev)
 	if (error)
 		return dev_err_probe(dev, error, "could not register reset controller\n");
 
+	error = rzv2h_usb2phy_reset_mux_register(dev, priv->base, "vbus-sel-mux");
+	if (error)
+		return dev_err_probe(dev, error, "could not register aux mux\n");
+
 	return 0;
 }
 
-- 
2.43.0