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AXP PMICs have a pin which can either report the USB VBUS state, or driving a regulator that supplies USB VBUS. Add a regulator driver for controlling this pin. The selection between input and output is done via the x-powers,drive-vbus-en pin on the PMIC (parent) node. Signed-off-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <dm.h>
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#include <power/pmic.h>
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#include <power/regulator.h>
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#define AXP_VBUS_IPSOUT 0x30
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#define AXP_VBUS_IPSOUT_DRIVEBUS BIT(2)
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#define AXP_MISC_CTRL 0x8f
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#define AXP_MISC_CTRL_N_VBUSEN_FUNC BIT(4)
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static int axp_drivevbus_get_enable(struct udevice *dev)
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{
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int ret;
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ret = pmic_reg_read(dev->parent, AXP_VBUS_IPSOUT);
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if (ret < 0)
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return ret;
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return !!(ret & AXP_VBUS_IPSOUT_DRIVEBUS);
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}
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static int axp_drivevbus_set_enable(struct udevice *dev, bool enable)
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{
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return pmic_clrsetbits(dev->parent, AXP_VBUS_IPSOUT,
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AXP_VBUS_IPSOUT_DRIVEBUS,
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enable ? AXP_VBUS_IPSOUT_DRIVEBUS : 0);
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}
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static const struct dm_regulator_ops axp_drivevbus_ops = {
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.get_enable = axp_drivevbus_get_enable,
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.set_enable = axp_drivevbus_set_enable,
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};
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static int axp_drivevbus_probe(struct udevice *dev)
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{
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struct dm_regulator_uclass_plat *uc_plat = dev_get_uclass_plat(dev);
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int ret;
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uc_plat->type = REGULATOR_TYPE_FIXED;
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if (dev_read_bool(dev->parent, "x-powers,drive-vbus-en")) {
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ret = pmic_clrsetbits(dev->parent, AXP_MISC_CTRL,
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AXP_MISC_CTRL_N_VBUSEN_FUNC, 0);
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if (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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U_BOOT_DRIVER(axp_drivevbus) = {
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.name = "axp_drivevbus",
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.id = UCLASS_REGULATOR,
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.probe = axp_drivevbus_probe,
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.ops = &axp_drivevbus_ops,
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};
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