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 the
rzv2h-usb-vbenctl auxiliary driver during probe.

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

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index a2f56ea470c597d554c1ef446f05f6bfd262fffd..2fda1d9622f49a7feed4d2d5b90dcefecae18451 100644 (file)
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -257,6 +257,7 @@ 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
        select REGMAP_MMIO
        help
          Support for USB2PHY Port reset Control found on the RZ/V2H(P) SoC

diff --git a/drivers/reset/reset-rzv2h-usb2phy.c b/drivers/reset/reset-rzv2h-usb2phy.c
index c79bf72602e8a3fe12b716c9a9a0d17d7a32e41d..d96042e28cd58503f78f9b19aac71b62ad666350 100644 (file)
--- a/drivers/reset/reset-rzv2h-usb2phy.c
+++ b/drivers/reset/reset-rzv2h-usb2phy.c
@@ -5,7 +5,9 @@
  * Copyright (C) 2025 Renesas Electronics Corporation
  */
 
+#include <linux/auxiliary_bus.h>
 #include <linux/delay.h>
+#include <linux/idr.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -15,6 +17,8 @@
 #include <linux/reset.h>
 #include <linux/reset-controller.h>
 
+static DEFINE_IDA(auxiliary_ids);
+
 struct rzv2h_usb2phy_reset_of_data {
        const struct reg_sequence *init_seq;
        unsigned int init_nseq;
@@ -84,6 +88,33 @@ static int rzv2h_usb2phy_reset_of_xlate(struct reset_controller_dev *rcdev,
        return 0;
 }
 
+static void rzv2h_usb2phy_reset_ida_free(void *data)
+{
+       struct auxiliary_device *adev = data;
+
+       ida_free(&auxiliary_ids, adev->id);
+}
+
+static int rzv2h_usb2phy_reset_mux_register(struct device *dev,
+                                           const char *mux_name)
+{
+       struct auxiliary_device *adev;
+       int id;
+
+       id = ida_alloc(&auxiliary_ids, GFP_KERNEL);
+       if (id < 0)
+               return id;
+
+       adev = __devm_auxiliary_device_create(dev, dev->driver->name,
+                                             mux_name, NULL, id);
+       if (!adev) {
+               ida_free(&auxiliary_ids, id);
+               return -ENOMEM;
+       }
+
+       return devm_add_action_or_reset(dev, rzv2h_usb2phy_reset_ida_free, adev);
+}
+
 static const struct regmap_config rzv2h_usb2phy_reset_regconf = {
        .reg_bits = 32,
        .val_bits = 32,
@@ -153,6 +184,10 @@ 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, "vbenctl");
+       if (error)
+               return dev_err_probe(dev, error, "could not register aux mux\n");
+
        return 0;
 }