[PATCH 2/2] power: regulator: add qcom-usb-vbus

[Rui Miguel Silva]

Hey Caleb,
On Thu Mar 20, 2025 at 5:34 PM WET, Caleb Connolly wrote:

>
> Jaehoon: do you mind if I just take these both through the Qualcomm tree?
>
> If not then feel free to pick this one up
>
> Acked-by: Caleb Connolly <caleb.connolly at linaro.org>

Maybe it is easier/faster for you to pick this ones, one month passed.
Thanks in advance.

Cheers,
   Rui

>
> On 2/27/25 09:45, Rui Miguel Silva wrote:
>> Add regulator driver that allow some Qualcomm PMIC to
>> feed VBUS output to peripherals that are connected.
>> 
>> Signed-off-by: Rui Miguel Silva <rui.silva at linaro.org>
>> ---
>>   drivers/power/regulator/Kconfig               |   7 ++
>>   drivers/power/regulator/Makefile              |   1 +
>>   .../power/regulator/qcom_usb_vbus_regulator.c | 111 ++++++++++++++++++
>>   3 files changed, 119 insertions(+)
>>   create mode 100644 drivers/power/regulator/qcom_usb_vbus_regulator.c
>> 
>> diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
>> index 958f337c7e73..558133e09bf8 100644
>> --- a/drivers/power/regulator/Kconfig
>> +++ b/drivers/power/regulator/Kconfig
>> @@ -224,6 +224,13 @@ config DM_REGULATOR_QCOM_RPMH
>>   	  implements get/set api for a limited set of regulators used
>>   	  by u-boot.
>>   
>> +config DM_REGULATOR_QCOM_USB_VBUS
>> +	bool "Enable driver model for Qualcomm USB vbus regulator"
>> +	depends on DM_REGULATOR
>> +	---help---
>> +	  Enable support for the Qualcomm USB Vbus regulator. The driver
>> +	  implements get/set api for the regulator to be used by u-boot.
>> +
>>   config SPL_DM_REGULATOR_GPIO
>>   	bool "Enable Driver Model for GPIO REGULATOR in SPL"
>>   	depends on DM_REGULATOR_GPIO && SPL_GPIO
>> diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
>> index ca6c89d13b5c..a4191b9302b1 100644
>> --- a/drivers/power/regulator/Makefile
>> +++ b/drivers/power/regulator/Makefile
>> @@ -22,6 +22,7 @@ obj-$(CONFIG_$(XPL_)DM_REGULATOR_COMMON) += regulator_common.o
>>   obj-$(CONFIG_$(XPL_)DM_REGULATOR_FIXED) += fixed.o
>>   obj-$(CONFIG_$(XPL_)DM_REGULATOR_GPIO) += gpio-regulator.o
>>   obj-$(CONFIG_DM_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
>> +obj-$(CONFIG_DM_REGULATOR_QCOM_USB_VBUS) += qcom_usb_vbus_regulator.o
>>   obj-$(CONFIG_$(PHASE_)REGULATOR_RK8XX) += rk8xx.o
>>   obj-$(CONFIG_DM_REGULATOR_S2MPS11) += s2mps11_regulator.o
>>   obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
>> diff --git a/drivers/power/regulator/qcom_usb_vbus_regulator.c b/drivers/power/regulator/qcom_usb_vbus_regulator.c
>> new file mode 100644
>> index 000000000000..2d58ef5e111e
>> --- /dev/null
>> +++ b/drivers/power/regulator/qcom_usb_vbus_regulator.c
>> @@ -0,0 +1,111 @@
>> +// SPDX-License-Identifier: BSD-3-Clause
>> +/*
>> + * Copyright (c) 2025, Linaro Limited
>> + */
>> +#define pr_fmt(fmt) "qcom_usb_vbus: " fmt
>> +
>> +#include <bitfield.h>
>> +#include <errno.h>
>> +#include <dm.h>
>> +#include <fdtdec.h>
>> +#include <log.h>
>> +#include <asm/gpio.h>
>> +#include <linux/bitops.h>
>> +#include <linux/printk.h>
>> +#include <power/pmic.h>
>> +#include <power/regulator.h>
>> +
>> +#define CMD_OTG				0x50
>> +#define OTG_EN				BIT(0)
>> +// The 0 bit in this register's bit field is undocumented
>> +#define OTG_CFG				0x56
>> +#define OTG_EN_SRC_CFG			BIT(1)
>> +
>> +struct qcom_usb_vbus_priv {
>> +	phys_addr_t base;
>> +};
>> +
>> +static int qcom_usb_vbus_regulator_of_to_plat(struct udevice *dev)
>> +{
>> +	struct qcom_usb_vbus_priv *priv = dev_get_priv(dev);
>> +
>> +	priv->base = dev_read_addr(dev);
>> +	if (priv->base == FDT_ADDR_T_NONE)
>> +		return -EINVAL;
>> +
>> +	return 0;
>> +}
>> +
>> +static int qcom_usb_vbus_regulator_get_enable(struct udevice *dev)
>> +{
>> +	struct qcom_usb_vbus_priv *priv = dev_get_priv(dev);
>> +	int otg_en_reg = priv->base + CMD_OTG;
>> +	int ret;
>> +
>> +	ret = pmic_reg_read(dev->parent, otg_en_reg);
>> +	if (ret < 0)
>> +		log_err("failed to read usb vbus: %d\n", ret);
>> +	else
>> +		ret &= OTG_EN;
>> +
>> +	return ret;
>> +}
>> +
>> +static int qcom_usb_vbus_regulator_set_enable(struct udevice *dev, bool enable)
>> +{
>> +	struct qcom_usb_vbus_priv *priv = dev_get_priv(dev);
>> +	int otg_en_reg = priv->base + CMD_OTG;
>> +	int ret;
>> +
>> +	if (enable) {
>> +		ret = pmic_clrsetbits(dev->parent, otg_en_reg, 0, OTG_EN);
>> +		if (ret < 0) {
>> +			log_err("error enabling: %d\n", ret);
>> +			return ret;
>> +		}
>> +	} else {
>> +		ret = pmic_clrsetbits(dev->parent, otg_en_reg, OTG_EN, 0);
>> +		if (ret < 0) {
>> +			log_err("error disabling: %d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int qcom_usb_vbus_regulator_probe(struct udevice *dev)
>> +{
>> +	struct qcom_usb_vbus_priv *priv = dev_get_priv(dev);
>> +	int otg_cfg_reg = priv->base + OTG_CFG;
>> +	int ret;
>> +
>> +	/* Disable HW logic for VBUS enable */
>> +	ret = pmic_clrsetbits(dev->parent, otg_cfg_reg, OTG_EN_SRC_CFG, 0);
>> +	if (ret < 0) {
>> +		log_err("error setting EN_SRC_CFG: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct dm_regulator_ops qcom_usb_vbus_regulator_ops = {
>> +	.get_enable = qcom_usb_vbus_regulator_get_enable,
>> +	.set_enable = qcom_usb_vbus_regulator_set_enable,
>> +};
>> +
>> +static const struct udevice_id qcom_usb_vbus_regulator_ids[] = {
>> +	{ .compatible = "qcom,pm8150b-vbus-reg"},
>> +	{ },
>> +};
>> +
>> +U_BOOT_DRIVER(qcom_usb_vbus_regulator) = {
>> +	.name = "qcom-usb-vbus-regulator",
>> +	.id = UCLASS_REGULATOR,
>> +	.of_match = qcom_usb_vbus_regulator_ids,
>> +	.of_to_plat = qcom_usb_vbus_regulator_of_to_plat,
>> +	.ops = &qcom_usb_vbus_regulator_ops,
>> +	.probe = qcom_usb_vbus_regulator_probe,
>> +	.priv_auto = sizeof(struct qcom_usb_vbus_priv),
>> +};
>
> -- 
> Caleb (they/them)