--- /dev/null
+STM32 VREFBUF - Voltage reference buffer
+
+Some STM32 devices embed a voltage reference buffer which can be used as
+voltage reference for ADCs, DACs and also as voltage reference for external
+components through the dedicated VREF+ pin.
+
+Required properties:
+- compatible: Must be "st,stm32-vrefbuf".
+- reg: Offset and length of VREFBUF register set.
+- clocks: Must contain an entry for peripheral clock.
+
+Example:
+ vrefbuf: regulator@58003C00 {
+ compatible = "st,stm32-vrefbuf";
+ reg = <0x58003C00 0x8>;
+ clocks = <&rcc VREF_CK>;
+ regulator-min-microvolt = <1500000>;
+ regulator-max-microvolt = <2500000>;
+ vdda-supply = <&vdda>;
+ };
tristate "Ricoh RN5T567/618 voltage regulators"
depends on MFD_RN5T618
help
- Say y here to support the regulators found on Ricoh RN5T567 or
- RN5T618 PMIC.
+ Say y here to support the regulators found on Ricoh RN5T567,
+ RN5T618 or RC5T619 PMIC.
config REGULATOR_RT5033
tristate "Richtek RT5033 Regulators"
This driver can also be built as a module. If so, the module
will be called sky81452-regulator.
+config REGULATOR_STM32_VREFBUF
+ tristate "STMicroelectronics STM32 VREFBUF"
+ depends on ARCH_STM32 || COMPILE_TEST
+ help
+ This driver supports STMicroelectronics STM32 VREFBUF (voltage
+ reference buffer) which can be used as voltage reference for
+ internal ADCs, DACs and also for external components through
+ dedicated Vref+ pin.
+
+ This driver can also be built as a module. If so, the module
+ will be called stm32-vrefbuf.
+
config REGULATOR_TI_ABB
tristate "TI Adaptive Body Bias on-chip LDO"
depends on ARCH_OMAP
obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o
+obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o
obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o
REG(LDORTC2, LDOEN2, BIT(5), LDORTC2DAC, 0x7f, 900000, 3500000, 25000),
};
+static struct regulator_desc rc5t619_regulators[] = {
+ /* DCDC */
+ REG(DCDC1, DC1CTL, BIT(0), DC1DAC, 0xff, 600000, 3500000, 12500),
+ REG(DCDC2, DC2CTL, BIT(0), DC2DAC, 0xff, 600000, 3500000, 12500),
+ REG(DCDC3, DC3CTL, BIT(0), DC3DAC, 0xff, 600000, 3500000, 12500),
+ REG(DCDC4, DC4CTL, BIT(0), DC4DAC, 0xff, 600000, 3500000, 12500),
+ REG(DCDC5, DC5CTL, BIT(0), DC5DAC, 0xff, 600000, 3500000, 12500),
+ /* LDO */
+ REG(LDO1, LDOEN1, BIT(0), LDO1DAC, 0x7f, 900000, 3500000, 25000),
+ REG(LDO2, LDOEN1, BIT(1), LDO2DAC, 0x7f, 900000, 3500000, 25000),
+ REG(LDO3, LDOEN1, BIT(2), LDO3DAC, 0x7f, 900000, 3500000, 25000),
+ REG(LDO4, LDOEN1, BIT(3), LDO4DAC, 0x7f, 900000, 3500000, 25000),
+ REG(LDO5, LDOEN1, BIT(4), LDO5DAC, 0x7f, 600000, 3500000, 25000),
+ REG(LDO6, LDOEN1, BIT(5), LDO6DAC, 0x7f, 600000, 3500000, 25000),
+ REG(LDO7, LDOEN1, BIT(6), LDO7DAC, 0x7f, 900000, 3500000, 25000),
+ REG(LDO8, LDOEN1, BIT(7), LDO8DAC, 0x7f, 900000, 3500000, 25000),
+ REG(LDO9, LDOEN2, BIT(0), LDO9DAC, 0x7f, 900000, 3500000, 25000),
+ REG(LDO10, LDOEN2, BIT(0), LDO10DAC, 0x7f, 900000, 3500000, 25000),
+ /* LDO RTC */
+ REG(LDORTC1, LDOEN2, BIT(4), LDORTCDAC, 0x7f, 1700000, 3500000, 25000),
+ REG(LDORTC2, LDOEN2, BIT(5), LDORTC2DAC, 0x7f, 900000, 3500000, 25000),
+};
+
static int rn5t618_regulator_probe(struct platform_device *pdev)
{
struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
struct regulator_dev *rdev;
struct regulator_desc *regulators;
int i;
+ int num_regulators = 0;
switch (rn5t618->variant) {
case RN5T567:
regulators = rn5t567_regulators;
+ num_regulators = ARRAY_SIZE(rn5t567_regulators);
break;
case RN5T618:
regulators = rn5t618_regulators;
+ num_regulators = ARRAY_SIZE(rn5t618_regulators);
+ break;
+ case RC5T619:
+ regulators = rc5t619_regulators;
+ num_regulators = ARRAY_SIZE(rc5t619_regulators);
break;
default:
return -EINVAL;
config.dev = pdev->dev.parent;
config.regmap = rn5t618->regmap;
- for (i = 0; i < RN5T618_REG_NUM; i++) {
- if (!regulators[i].name)
- continue;
-
+ for (i = 0; i < num_regulators; i++) {
rdev = devm_regulator_register(&pdev->dev,
®ulators[i],
&config);
--- /dev/null
+/*
+ * Copyright (C) STMicroelectronics 2017
+ *
+ * Author: Fabrice Gasnier <fabrice.gasnier@st.com>
+ *
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+/* STM32 VREFBUF registers */
+#define STM32_VREFBUF_CSR 0x00
+
+/* STM32 VREFBUF CSR bitfields */
+#define STM32_VRS GENMASK(6, 4)
+#define STM32_VRR BIT(3)
+#define STM32_HIZ BIT(1)
+#define STM32_ENVR BIT(0)
+
+struct stm32_vrefbuf {
+ void __iomem *base;
+ struct clk *clk;
+};
+
+static const unsigned int stm32_vrefbuf_voltages[] = {
+ /* Matches resp. VRS = 000b, 001b, 010b, 011b */
+ 2500000, 2048000, 1800000, 1500000,
+};
+
+static int stm32_vrefbuf_enable(struct regulator_dev *rdev)
+{
+ struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
+ u32 val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
+ int ret;
+
+ val = (val & ~STM32_HIZ) | STM32_ENVR;
+ writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);
+
+ /*
+ * Vrefbuf startup time depends on external capacitor: wait here for
+ * VRR to be set. That means output has reached expected value.
+ * ~650us sleep should be enough for caps up to 1.5uF. Use 10ms as
+ * arbitrary timeout.
+ */
+ ret = readl_poll_timeout(priv->base + STM32_VREFBUF_CSR, val,
+ !(val & STM32_VRR), 650, 10000);
+ if (ret) {
+ dev_err(&rdev->dev, "stm32 vrefbuf timed out!\n");
+ val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
+ val = (val & ~STM32_ENVR) | STM32_HIZ;
+ writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);
+ }
+
+ return ret;
+}
+
+static int stm32_vrefbuf_disable(struct regulator_dev *rdev)
+{
+ struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
+ u32 val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
+
+ val = (val & ~STM32_ENVR) | STM32_HIZ;
+ writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);
+
+ return 0;
+}
+
+static int stm32_vrefbuf_is_enabled(struct regulator_dev *rdev)
+{
+ struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
+
+ return readl_relaxed(priv->base + STM32_VREFBUF_CSR) & STM32_ENVR;
+}
+
+static int stm32_vrefbuf_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned sel)
+{
+ struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
+ u32 val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
+
+ val = (val & ~STM32_VRS) | FIELD_PREP(STM32_VRS, sel);
+ writel_relaxed(val, priv->base + STM32_VREFBUF_CSR);
+
+ return 0;
+}
+
+static int stm32_vrefbuf_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
+ u32 val = readl_relaxed(priv->base + STM32_VREFBUF_CSR);
+
+ return FIELD_GET(STM32_VRS, val);
+}
+
+static const struct regulator_ops stm32_vrefbuf_volt_ops = {
+ .enable = stm32_vrefbuf_enable,
+ .disable = stm32_vrefbuf_disable,
+ .is_enabled = stm32_vrefbuf_is_enabled,
+ .get_voltage_sel = stm32_vrefbuf_get_voltage_sel,
+ .set_voltage_sel = stm32_vrefbuf_set_voltage_sel,
+ .list_voltage = regulator_list_voltage_table,
+};
+
+static const struct regulator_desc stm32_vrefbuf_regu = {
+ .name = "vref",
+ .supply_name = "vdda",
+ .volt_table = stm32_vrefbuf_voltages,
+ .n_voltages = ARRAY_SIZE(stm32_vrefbuf_voltages),
+ .ops = &stm32_vrefbuf_volt_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+};
+
+static int stm32_vrefbuf_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct stm32_vrefbuf *priv;
+ struct regulator_config config = { };
+ struct regulator_dev *rdev;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ priv->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(priv->clk))
+ return PTR_ERR(priv->clk);
+
+ ret = clk_prepare_enable(priv->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "clk prepare failed with error %d\n", ret);
+ return ret;
+ }
+
+ config.dev = &pdev->dev;
+ config.driver_data = priv;
+ config.of_node = pdev->dev.of_node;
+ config.init_data = of_get_regulator_init_data(&pdev->dev,
+ pdev->dev.of_node,
+ &stm32_vrefbuf_regu);
+
+ rdev = regulator_register(&stm32_vrefbuf_regu, &config);
+ if (IS_ERR(rdev)) {
+ ret = PTR_ERR(rdev);
+ dev_err(&pdev->dev, "register failed with error %d\n", ret);
+ goto err_clk_dis;
+ }
+ platform_set_drvdata(pdev, rdev);
+
+ return 0;
+
+err_clk_dis:
+ clk_disable_unprepare(priv->clk);
+
+ return ret;
+}
+
+static int stm32_vrefbuf_remove(struct platform_device *pdev)
+{
+ struct regulator_dev *rdev = platform_get_drvdata(pdev);
+ struct stm32_vrefbuf *priv = rdev_get_drvdata(rdev);
+
+ regulator_unregister(rdev);
+ clk_disable_unprepare(priv->clk);
+
+ return 0;
+};
+
+static const struct of_device_id stm32_vrefbuf_of_match[] = {
+ { .compatible = "st,stm32-vrefbuf", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, stm32_vrefbuf_of_match);
+
+static struct platform_driver stm32_vrefbuf_driver = {
+ .probe = stm32_vrefbuf_probe,
+ .remove = stm32_vrefbuf_remove,
+ .driver = {
+ .name = "stm32-vrefbuf",
+ .of_match_table = of_match_ptr(stm32_vrefbuf_of_match),
+ },
+};
+module_platform_driver(stm32_vrefbuf_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics STM32 VREFBUF driver");
+MODULE_ALIAS("platform:stm32-vrefbuf");
RN5T618_DCDC2,
RN5T618_DCDC3,
RN5T618_DCDC4,
+ RN5T618_DCDC5,
RN5T618_LDO1,
RN5T618_LDO2,
RN5T618_LDO3,
RN5T618_LDO4,
RN5T618_LDO5,
+ RN5T618_LDO6,
+ RN5T618_LDO7,
+ RN5T618_LDO8,
+ RN5T618_LDO9,
+ RN5T618_LDO10,
RN5T618_LDORTC1,
RN5T618_LDORTC2,
RN5T618_REG_NUM,
projects / platform / kernel / linux-starfive.git / commitdiff