forked from OERV-BSP/u-boot
925efba579
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@linaro.org> Acked-by: Caleb Connolly <caleb.connolly@linaro.org> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org> Link: https://lore.kernel.org/r/20250227094911.497219-3-rui.silva@linaro.org Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
// SPDX-License-Identifier: BSD-3-Clause
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/*
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* Copyright (c) 2025, Linaro Limited
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*/
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#define pr_fmt(fmt) "qcom_usb_vbus: " fmt
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#include <bitfield.h>
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#include <errno.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <log.h>
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#include <asm/gpio.h>
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#include <linux/bitops.h>
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#include <linux/printk.h>
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#include <power/pmic.h>
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#include <power/regulator.h>
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#define CMD_OTG 0x50
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#define OTG_EN BIT(0)
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// The 0 bit in this register's bit field is undocumented
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#define OTG_CFG 0x56
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#define OTG_EN_SRC_CFG BIT(1)
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struct qcom_usb_vbus_priv {
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phys_addr_t base;
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};
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static int qcom_usb_vbus_regulator_of_to_plat(struct udevice *dev)
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{
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struct qcom_usb_vbus_priv *priv = dev_get_priv(dev);
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priv->base = dev_read_addr(dev);
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if (priv->base == FDT_ADDR_T_NONE)
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return -EINVAL;
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return 0;
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}
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static int qcom_usb_vbus_regulator_get_enable(struct udevice *dev)
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{
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struct qcom_usb_vbus_priv *priv = dev_get_priv(dev);
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int otg_en_reg = priv->base + CMD_OTG;
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int ret;
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ret = pmic_reg_read(dev->parent, otg_en_reg);
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if (ret < 0)
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log_err("failed to read usb vbus: %d\n", ret);
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else
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ret &= OTG_EN;
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return ret;
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}
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static int qcom_usb_vbus_regulator_set_enable(struct udevice *dev, bool enable)
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{
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struct qcom_usb_vbus_priv *priv = dev_get_priv(dev);
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int otg_en_reg = priv->base + CMD_OTG;
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int ret;
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if (enable) {
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ret = pmic_clrsetbits(dev->parent, otg_en_reg, 0, OTG_EN);
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if (ret < 0) {
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log_err("error enabling: %d\n", ret);
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return ret;
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}
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} else {
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ret = pmic_clrsetbits(dev->parent, otg_en_reg, OTG_EN, 0);
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if (ret < 0) {
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log_err("error disabling: %d\n", ret);
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return ret;
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}
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}
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return 0;
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}
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static int qcom_usb_vbus_regulator_probe(struct udevice *dev)
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{
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struct qcom_usb_vbus_priv *priv = dev_get_priv(dev);
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int otg_cfg_reg = priv->base + OTG_CFG;
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int ret;
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/* Disable HW logic for VBUS enable */
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ret = pmic_clrsetbits(dev->parent, otg_cfg_reg, OTG_EN_SRC_CFG, 0);
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if (ret < 0) {
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log_err("error setting EN_SRC_CFG: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static const struct dm_regulator_ops qcom_usb_vbus_regulator_ops = {
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.get_enable = qcom_usb_vbus_regulator_get_enable,
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.set_enable = qcom_usb_vbus_regulator_set_enable,
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};
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static const struct udevice_id qcom_usb_vbus_regulator_ids[] = {
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{ .compatible = "qcom,pm8150b-vbus-reg"},
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{ },
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};
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U_BOOT_DRIVER(qcom_usb_vbus_regulator) = {
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.name = "qcom-usb-vbus-regulator",
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.id = UCLASS_REGULATOR,
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.of_match = qcom_usb_vbus_regulator_ids,
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.of_to_plat = qcom_usb_vbus_regulator_of_to_plat,
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.ops = &qcom_usb_vbus_regulator_ops,
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.probe = qcom_usb_vbus_regulator_probe,
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.priv_auto = sizeof(struct qcom_usb_vbus_priv),
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};
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