Qualcomm REFGEN regulator
Merge series from Konrad Dybcio <konrad.dybcio@linaro.org>: Recent Qualcomm SoCs have a REFGEN (reference voltage generator) regulator responsible for providing a reference voltage to some on-SoC IPs (like DSI or PHYs). It can be turned off when unused to save power. This series introduces the driver for it.
This commit is contained in:
Mark Brown
commit
4d8cd4d289
@ -0,0 +1,57 @@
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/regulator/qcom,sdm845-refgen-regulator.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Qualcomm Technologies, Inc. REFGEN Regulator
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maintainers:
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- Konrad Dybcio <konradybcio@kernel.org>
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description:
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The REFGEN (reference voltage generator) regulator provides reference
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voltage for on-chip IPs (like PHYs) on some Qualcomm SoCs.
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allOf:
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- $ref: regulator.yaml#
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properties:
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compatible:
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oneOf:
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- items:
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- enum:
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- qcom,sc7180-refgen-regulator
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- qcom,sc8180x-refgen-regulator
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- qcom,sm8150-refgen-regulator
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- const: qcom,sdm845-refgen-regulator
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- items:
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- enum:
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- qcom,sc7280-refgen-regulator
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- qcom,sc8280xp-refgen-regulator
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- qcom,sm6350-refgen-regulator
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- qcom,sm6375-refgen-regulator
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- qcom,sm8350-refgen-regulator
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- const: qcom,sm8250-refgen-regulator
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- enum:
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- qcom,sdm845-refgen-regulator
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- qcom,sm8250-refgen-regulator
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reg:
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maxItems: 1
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required:
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- compatible
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- reg
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unevaluatedProperties: false
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examples:
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- |
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regulator@162f000 {
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compatible = "qcom,sm8250-refgen-regulator";
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reg = <0x0162f000 0x84>;
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};
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...
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@ -989,6 +989,17 @@ config REGULATOR_PWM
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This driver supports PWM controlled voltage regulators. PWM
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duty cycle can increase or decrease the voltage.
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config REGULATOR_QCOM_REFGEN
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tristate "Qualcomm REFGEN regulator driver"
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depends on HAS_IOMEM
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depends on REGMAP
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help
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This driver supports the MMIO-mapped reference voltage regulator,
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used internally by some PHYs on many Qualcomm SoCs.
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Say M here if you want to include support for this regulator as
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a module. The module will be named "qcom-refgen-regulator".
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config REGULATOR_QCOM_RPM
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tristate "Qualcomm RPM regulator driver"
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depends on MFD_QCOM_RPM
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@ -108,6 +108,7 @@ obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o
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obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o
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obj-$(CONFIG_REGULATOR_MTK_DVFSRC) += mtk-dvfsrc-regulator.o
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obj-$(CONFIG_REGULATOR_QCOM_LABIBB) += qcom-labibb-regulator.o
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obj-$(CONFIG_REGULATOR_QCOM_REFGEN) += qcom-refgen-regulator.o
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obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
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obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
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obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o
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154
drivers/regulator/qcom-refgen-regulator.c
Normal file
154
drivers/regulator/qcom-refgen-regulator.c
Normal file
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// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2017, 2019-2020, The Linux Foundation. All rights reserved.
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// Copyright (c) 2023, Linaro Limited
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#include <linux/bitfield.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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#define REFGEN_REG_BIAS_EN 0x08
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#define REFGEN_BIAS_EN_MASK GENMASK(2, 0)
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#define REFGEN_BIAS_EN_ENABLE 0x7
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#define REFGEN_BIAS_EN_DISABLE 0x6
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#define REFGEN_REG_BG_CTRL 0x14
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#define REFGEN_BG_CTRL_MASK GENMASK(2, 1)
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#define REFGEN_BG_CTRL_ENABLE 0x3
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#define REFGEN_BG_CTRL_DISABLE 0x2
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#define REFGEN_REG_PWRDWN_CTRL5 0x80
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#define REFGEN_PWRDWN_CTRL5_MASK BIT(0)
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#define REFGEN_PWRDWN_CTRL5_ENABLE 0x1
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static int qcom_sdm845_refgen_enable(struct regulator_dev *rdev)
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{
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regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK,
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FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_ENABLE));
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regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN,
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FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_ENABLE));
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return 0;
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}
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static int qcom_sdm845_refgen_disable(struct regulator_dev *rdev)
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{
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regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN,
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FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_DISABLE));
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regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK,
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FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_DISABLE));
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return 0;
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}
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static int qcom_sdm845_refgen_is_enabled(struct regulator_dev *rdev)
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{
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u32 val;
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regmap_read(rdev->regmap, REFGEN_REG_BG_CTRL, &val);
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if (FIELD_GET(REFGEN_BG_CTRL_MASK, val) != REFGEN_BG_CTRL_ENABLE)
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return 0;
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regmap_read(rdev->regmap, REFGEN_REG_BIAS_EN, &val);
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if (FIELD_GET(REFGEN_BIAS_EN_MASK, val) != REFGEN_BIAS_EN_ENABLE)
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return 0;
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return 1;
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}
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static struct regulator_desc sdm845_refgen_desc = {
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.enable_time = 5,
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.name = "refgen",
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.owner = THIS_MODULE,
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.type = REGULATOR_VOLTAGE,
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.ops = &(const struct regulator_ops) {
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.enable = qcom_sdm845_refgen_enable,
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.disable = qcom_sdm845_refgen_disable,
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.is_enabled = qcom_sdm845_refgen_is_enabled,
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},
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};
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static struct regulator_desc sm8250_refgen_desc = {
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.enable_reg = REFGEN_REG_PWRDWN_CTRL5,
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.enable_mask = REFGEN_PWRDWN_CTRL5_MASK,
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.enable_val = REFGEN_PWRDWN_CTRL5_ENABLE,
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.disable_val = 0,
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.enable_time = 5,
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.name = "refgen",
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.owner = THIS_MODULE,
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.type = REGULATOR_VOLTAGE,
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.ops = &(const struct regulator_ops) {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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},
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};
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static const struct regmap_config qcom_refgen_regmap_config = {
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.reg_bits = 32,
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.reg_stride = 4,
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.val_bits = 32,
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.fast_io = true,
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};
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static int qcom_refgen_probe(struct platform_device *pdev)
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{
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struct regulator_init_data *init_data;
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struct regulator_config config = {};
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const struct regulator_desc *rdesc;
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struct device *dev = &pdev->dev;
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struct regulator_dev *rdev;
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struct regmap *regmap;
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void __iomem *base;
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rdesc = of_device_get_match_data(dev);
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if (!rdesc)
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return -ENODATA;
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base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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regmap = devm_regmap_init_mmio(dev, base, &qcom_refgen_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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init_data = of_get_regulator_init_data(dev, dev->of_node, rdesc);
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if (!init_data)
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return -ENOMEM;
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config.dev = dev;
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config.init_data = init_data;
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config.of_node = dev->of_node;
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config.regmap = regmap;
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rdev = devm_regulator_register(dev, rdesc, &config);
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if (IS_ERR(rdev))
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return PTR_ERR(rdev);
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return 0;
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}
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static const struct of_device_id qcom_refgen_match_table[] = {
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{ .compatible = "qcom,sdm845-refgen-regulator", .data = &sdm845_refgen_desc },
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{ .compatible = "qcom,sm8250-refgen-regulator", .data = &sm8250_refgen_desc },
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{ }
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};
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static struct platform_driver qcom_refgen_driver = {
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.probe = qcom_refgen_probe,
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.driver = {
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.name = "qcom-refgen-regulator",
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.of_match_table = qcom_refgen_match_table,
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},
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};
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module_platform_driver(qcom_refgen_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Qualcomm REFGEN regulator driver");
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