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/max77541.c | 220 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 220 insertions(+) create mode 100644 drivers/mfd/max77541.c (limited to 'drivers/mfd/max77541.c') diff --git a/drivers/mfd/max77541.c b/drivers/mfd/max77541.c new file mode 100644 index 000000000..f91b4f537 --- /dev/null +++ b/drivers/mfd/max77541.c @@ -0,0 +1,220 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2022 Analog Devices, Inc. + * Driver for the MAX77540 and MAX77541 + */ + +#include +#include +#include +#include +#include +#include + +static const struct regmap_config max77541_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static const struct regmap_irq max77541_src_irqs[] = { + { .mask = MAX77541_BIT_INT_SRC_TOPSYS }, + { .mask = MAX77541_BIT_INT_SRC_BUCK }, +}; + +static const struct regmap_irq_chip max77541_src_irq_chip = { + .name = "max77541-src", + .status_base = MAX77541_REG_INT_SRC, + .mask_base = MAX77541_REG_INT_SRC_M, + .num_regs = 1, + .irqs = max77541_src_irqs, + .num_irqs = ARRAY_SIZE(max77541_src_irqs), +}; + +static const struct regmap_irq max77541_topsys_irqs[] = { + { .mask = MAX77541_BIT_TOPSYS_INT_TJ_120C }, + { .mask = MAX77541_BIT_TOPSYS_INT_TJ_140C }, + { .mask = MAX77541_BIT_TOPSYS_INT_TSHDN }, + { .mask = MAX77541_BIT_TOPSYS_INT_UVLO }, + { .mask = MAX77541_BIT_TOPSYS_INT_ALT_SWO }, + { .mask = MAX77541_BIT_TOPSYS_INT_EXT_FREQ_DET }, +}; + +static const struct regmap_irq_chip max77541_topsys_irq_chip = { + .name = "max77541-topsys", + .status_base = MAX77541_REG_TOPSYS_INT, + .mask_base = MAX77541_REG_TOPSYS_INT_M, + .num_regs = 1, + .irqs = max77541_topsys_irqs, + .num_irqs = ARRAY_SIZE(max77541_topsys_irqs), +}; + +static const struct regmap_irq max77541_buck_irqs[] = { + { .mask = MAX77541_BIT_BUCK_INT_M1_POK_FLT }, + { .mask = MAX77541_BIT_BUCK_INT_M2_POK_FLT }, + { .mask = MAX77541_BIT_BUCK_INT_M1_SCFLT }, + { .mask = MAX77541_BIT_BUCK_INT_M2_SCFLT }, +}; + +static const struct regmap_irq_chip max77541_buck_irq_chip = { + .name = "max77541-buck", + .status_base = MAX77541_REG_BUCK_INT, + .mask_base = MAX77541_REG_BUCK_INT_M, + .num_regs = 1, + .irqs = max77541_buck_irqs, + .num_irqs = ARRAY_SIZE(max77541_buck_irqs), +}; + +static const struct regmap_irq max77541_adc_irqs[] = { + { .mask = MAX77541_BIT_ADC_INT_CH1_I }, + { .mask = MAX77541_BIT_ADC_INT_CH2_I }, + { .mask = MAX77541_BIT_ADC_INT_CH3_I }, + { .mask = MAX77541_BIT_ADC_INT_CH6_I }, +}; + +static const struct regmap_irq_chip max77541_adc_irq_chip = { + .name = "max77541-adc", + .status_base = MAX77541_REG_ADC_INT, + .mask_base = MAX77541_REG_ADC_INT_M, + .num_regs = 1, + .irqs = max77541_adc_irqs, + .num_irqs = ARRAY_SIZE(max77541_adc_irqs), +}; + +static const struct mfd_cell max77540_devs[] = { + MFD_CELL_OF("max77540-regulator", NULL, NULL, 0, 0, NULL), +}; + +static const struct mfd_cell max77541_devs[] = { + MFD_CELL_OF("max77541-regulator", NULL, NULL, 0, 0, NULL), + MFD_CELL_OF("max77541-adc", NULL, NULL, 0, 0, NULL), +}; + +static int max77541_pmic_irq_init(struct device *dev) +{ + struct max77541 *max77541 = dev_get_drvdata(dev); + int irq = max77541->i2c->irq; + int ret; + + ret = devm_regmap_add_irq_chip(dev, max77541->regmap, irq, + IRQF_ONESHOT | IRQF_SHARED, 0, + &max77541_src_irq_chip, + &max77541->irq_data); + if (ret) + return ret; + + ret = devm_regmap_add_irq_chip(dev, max77541->regmap, irq, + IRQF_ONESHOT | IRQF_SHARED, 0, + &max77541_topsys_irq_chip, + &max77541->irq_topsys); + if (ret) + return ret; + + ret = devm_regmap_add_irq_chip(dev, max77541->regmap, irq, + IRQF_ONESHOT | IRQF_SHARED, 0, + &max77541_buck_irq_chip, + &max77541->irq_buck); + if (ret) + return ret; + + if (max77541->id == MAX77541) { + ret = devm_regmap_add_irq_chip(dev, max77541->regmap, irq, + IRQF_ONESHOT | IRQF_SHARED, 0, + &max77541_adc_irq_chip, + &max77541->irq_adc); + if (ret) + return ret; + } + + return 0; +} + +static int max77541_pmic_setup(struct device *dev) +{ + struct max77541 *max77541 = dev_get_drvdata(dev); + const struct mfd_cell *cells; + int n_devs; + int ret; + + switch (max77541->id) { + case MAX77540: + cells = max77540_devs; + n_devs = ARRAY_SIZE(max77540_devs); + break; + case MAX77541: + cells = max77541_devs; + n_devs = ARRAY_SIZE(max77541_devs); + break; + default: + return -EINVAL; + } + + ret = max77541_pmic_irq_init(dev); + if (ret) + return dev_err_probe(dev, ret, "Failed to initialize IRQ\n"); + + ret = devm_device_init_wakeup(dev); + if (ret) + return dev_err_probe(dev, ret, "Unable to init wakeup\n"); + + return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, + cells, n_devs, NULL, 0, NULL); +} + +static int max77541_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct max77541 *max77541; + + max77541 = devm_kzalloc(dev, sizeof(*max77541), GFP_KERNEL); + if (!max77541) + return -ENOMEM; + + i2c_set_clientdata(client, max77541); + max77541->i2c = client; + + max77541->id = (uintptr_t)i2c_get_match_data(client); + if (!max77541->id) + return -EINVAL; + + max77541->regmap = devm_regmap_init_i2c(client, + &max77541_regmap_config); + if (IS_ERR(max77541->regmap)) + return dev_err_probe(dev, PTR_ERR(max77541->regmap), + "Failed to allocate register map\n"); + + return max77541_pmic_setup(dev); +} + +static const struct of_device_id max77541_of_id[] = { + { + .compatible = "adi,max77540", + .data = (void *)MAX77540, + }, + { + .compatible = "adi,max77541", + .data = (void *)MAX77541, + }, + { } +}; +MODULE_DEVICE_TABLE(of, max77541_of_id); + +static const struct i2c_device_id max77541_id[] = { + { "max77540", MAX77540 }, + { "max77541", MAX77541 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max77541_id); + +static struct i2c_driver max77541_driver = { + .driver = { + .name = "max77541", + .of_match_table = max77541_of_id, + }, + .probe = max77541_probe, + .id_table = max77541_id, +}; +module_i2c_driver(max77541_driver); + +MODULE_DESCRIPTION("MAX7740/MAX7741 Driver"); +MODULE_AUTHOR("Okan Sahin "); +MODULE_LICENSE("GPL"); -- cgit v1.3.1