From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/mfd/rt5033.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 133 insertions(+) create mode 100644 drivers/mfd/rt5033.c (limited to 'drivers/mfd/rt5033.c') diff --git a/drivers/mfd/rt5033.c b/drivers/mfd/rt5033.c new file mode 100644 index 000000000..072fd4447 --- /dev/null +++ b/drivers/mfd/rt5033.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MFD core driver for the Richtek RT5033. + * + * RT5033 comprises multiple sub-devices switcing charger, fuel gauge, + * flash LED, current source, LDO and BUCK regulators. + * + * Copyright (C) 2014 Samsung Electronics, Co., Ltd. + * Author: Beomho Seo + */ + +#include +#include +#include +#include +#include +#include + +static const struct regmap_irq rt5033_irqs[] = { + { .mask = RT5033_PMIC_IRQ_BUCKOCP, }, + { .mask = RT5033_PMIC_IRQ_BUCKLV, }, + { .mask = RT5033_PMIC_IRQ_SAFELDOLV, }, + { .mask = RT5033_PMIC_IRQ_LDOLV, }, + { .mask = RT5033_PMIC_IRQ_OT, }, + { .mask = RT5033_PMIC_IRQ_VDDA_UV, }, +}; + +static const struct regmap_irq_chip rt5033_irq_chip = { + .name = "rt5033", + .status_base = RT5033_REG_PMIC_IRQ_STAT, + .unmask_base = RT5033_REG_PMIC_IRQ_CTRL, + .num_regs = 1, + .irqs = rt5033_irqs, + .num_irqs = ARRAY_SIZE(rt5033_irqs), +}; + +static const struct mfd_cell rt5033_devs[] = { + { .name = "rt5033-regulator", }, + { + .name = "rt5033-charger", + .of_compatible = "richtek,rt5033-charger", + }, { + .name = "rt5033-led", + .of_compatible = "richtek,rt5033-led", + }, +}; + +static const struct regmap_config rt5033_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT5033_REG_END, +}; + +static int rt5033_i2c_probe(struct i2c_client *i2c) +{ + struct rt5033_dev *rt5033; + unsigned int dev_id, chip_rev; + int ret; + + rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL); + if (!rt5033) + return -ENOMEM; + + i2c_set_clientdata(i2c, rt5033); + rt5033->dev = &i2c->dev; + rt5033->irq = i2c->irq; + rt5033->wakeup = true; + + rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config); + if (IS_ERR(rt5033->regmap)) { + dev_err(&i2c->dev, "Failed to allocate register map.\n"); + return PTR_ERR(rt5033->regmap); + } + + ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id); + if (ret) { + dev_err(&i2c->dev, "Device not found\n"); + return -ENODEV; + } + chip_rev = dev_id & RT5033_CHIP_REV_MASK; + dev_info(&i2c->dev, "Device found (rev. %d)\n", chip_rev); + + ret = devm_regmap_add_irq_chip(rt5033->dev, rt5033->regmap, + rt5033->irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + 0, &rt5033_irq_chip, &rt5033->irq_data); + if (ret) { + dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n", + rt5033->irq, ret); + return ret; + } + + ret = devm_mfd_add_devices(rt5033->dev, -1, rt5033_devs, + ARRAY_SIZE(rt5033_devs), NULL, 0, + regmap_irq_get_domain(rt5033->irq_data)); + if (ret < 0) { + dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n"); + return ret; + } + + if (rt5033->wakeup) { + ret = devm_device_init_wakeup(rt5033->dev); + if (ret) + return dev_err_probe(rt5033->dev, ret, "Failed to init wakeup\n"); + } + + return 0; +} + +static const struct i2c_device_id rt5033_i2c_id[] = { + { "rt5033", }, + { } +}; +MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id); + +static const struct of_device_id rt5033_dt_match[] = { + { .compatible = "richtek,rt5033", }, + { } +}; +MODULE_DEVICE_TABLE(of, rt5033_dt_match); + +static struct i2c_driver rt5033_driver = { + .driver = { + .name = "rt5033", + .of_match_table = rt5033_dt_match, + }, + .probe = rt5033_i2c_probe, + .id_table = rt5033_i2c_id, +}; +module_i2c_driver(rt5033_driver); + +MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver"); +MODULE_AUTHOR("Beomho Seo "); +MODULE_LICENSE("GPL"); -- cgit v1.3.1