Commit f62fcdf8 authored by Tommaso Merciai's avatar Tommaso Merciai Committed by Philipp Zabel
Browse files

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: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarTommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent 890628c8

drivers/reset/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/reset/reset-rzv2h-usb2phy.c

+35 −0
Original line number Diff line number Diff line
@@ -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;

}