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reset: rzv2h-usb2phy: Add support for VBUS mux controller registration

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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>
This commit is contained in:
Tommaso Merciai
2026-04-01 17:16:11 +02:00
committed by Philipp Zabel
parent 890628c8d0
commit f62fcdf8ab
2 changed files with 36 additions and 0 deletions
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1
drivers/reset/Kconfig
View File

@@ -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

35
drivers/reset/reset-rzv2h-usb2phy.c
View File

@@ -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;
}