[PATCH v5 6/6] regulator: rt4831: Adds support for Richtek RT4831 DSV regulator

cy_huang
2020-12-17T15:02:35Z

From: ChiYuan Huang <cy_huang@richtek.com>

Adds support for Richtek RT4831 DSV Regulator

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
---
drivers/regulator/Kconfig | 10 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/rt4831-regulator.c | 198 +++++++++++++++++++++++++++++++++++
3 files changed, 209 insertions(+)
create mode 100644 drivers/regulator/rt4831-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 020a00d..3e875ad 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -931,6 +931,16 @@ config REGULATOR_RT4801
This adds support for voltage regulators in Richtek RT4801 Display Bias IC.
The device supports two regulators (DSVP/DSVN).

+config REGULATOR_RT4831
+ tristate "Richtek RT4831 DSV Regulators"
+ depends on MFD_RT4831
+ help
+ This adds support for voltage regulators in Richtek RT4831.
+ There are three regulators (VLCM/DSVP/DSVN).
+ VLCM is a virtual voltage input for DSVP/DSVN inside IC.
+ And DSVP/DSVN is the real Vout range from 4V to 6.5V.
+ It's common used to provide the power for the display panel.
+
config REGULATOR_RT5033
tristate "Richtek RT5033 Regulators"
depends on MFD_RT5033
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 6ebae51..eb587d4 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -115,6 +115,7 @@ obj-$(CONFIG_REGULATOR_RK808) += rk808-regulator.o
obj-$(CONFIG_REGULATOR_RN5T618) += rn5t618-regulator.o
obj-$(CONFIG_REGULATOR_ROHM) += rohm-regulator.o
obj-$(CONFIG_REGULATOR_RT4801) += rt4801-regulator.o
+obj-$(CONFIG_REGULATOR_RT4831) += rt4831-regulator.o
obj-$(CONFIG_REGULATOR_RT5033) += rt5033-regulator.o
obj-$(CONFIG_REGULATOR_RTMV20) += rtmv20-regulator.o
obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
diff --git a/drivers/regulator/rt4831-regulator.c b/drivers/regulator/rt4831-regulator.c
new file mode 100644
index 00000000..3d4695d
--- /dev/null
+++ b/drivers/regulator/rt4831-regulator.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/driver.h>
+
+enum {
+ DSV_OUT_VLCM = 0,
+ DSV_OUT_VPOS,
+ DSV_OUT_VNEG,
+ DSV_OUT_MAX
+};
+
+#define RT4831_REG_DSVEN 0x09
+#define RT4831_REG_VLCM 0x0c
+#define RT4831_REG_VPOS 0x0d
+#define RT4831_REG_VNEG 0x0e
+#define RT4831_REG_FLAGS 0x0f
+
+#define RT4831_VOLT_MASK GENMASK(5, 0)
+#define RT4831_DSVMODE_SHIFT 5
+#define RT4831_DSVMODE_MASK GENMASK(7, 5)
+#define RT4831_POSADEN_MASK BIT(4)
+#define RT4831_NEGADEN_MASK BIT(3)
+#define RT4831_POSEN_MASK BIT(2)
+#define RT4831_NEGEN_MASK BIT(1)
+
+#define RT4831_OTP_MASK BIT(6)
+#define RT4831_LCMOVP_MASK BIT(5)
+#define RT4831_VPOSSCP_MASK BIT(3)
+#define RT4831_VNEGSCP_MASK BIT(2)
+
+#define DSV_MODE_NORMAL (0x4 << RT4831_DSVMODE_SHIFT)
+#define DSV_MODE_BYPASS (0x6 << RT4831_DSVMODE_SHIFT)
+#define STEP_UV 50000
+#define VLCM_MIN_UV 4000000
+#define VLCM_MAX_UV 7150000
+#define VLCM_N_VOLTAGES ((VLCM_MAX_UV - VLCM_MIN_UV) / STEP_UV + 1)
+#define VPN_MIN_UV 4000000
+#define VPN_MAX_UV 6500000
+#define VPN_N_VOLTAGES ((VPN_MAX_UV - VPN_MIN_UV) / STEP_UV + 1)
+
+static int rt4831_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
+{
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ int rid = rdev_get_id(rdev);
+ unsigned int val, events = 0;
+ int ret;
+
+ ret = regmap_read(regmap, RT4831_REG_FLAGS, &val);
+ if (ret)
+ return ret;
+
+ if (val & RT4831_OTP_MASK)
+ events |= REGULATOR_ERROR_OVER_TEMP;
+
+ if (rid == DSV_OUT_VLCM && (val & RT4831_LCMOVP_MASK))
+ events |= REGULATOR_ERROR_OVER_CURRENT;
+
+ if (rid == DSV_OUT_VPOS && (val & RT4831_VPOSSCP_MASK))
+ events |= REGULATOR_ERROR_OVER_CURRENT;
+
+ if (rid == DSV_OUT_VNEG && (val & RT4831_VNEGSCP_MASK))
+ events |= REGULATOR_ERROR_OVER_CURRENT;
+
+ *flags = events;
+ return 0;
+}
+
+static const struct regulator_ops rt4831_dsvlcm_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_bypass = regulator_set_bypass_regmap,
+ .get_bypass = regulator_get_bypass_regmap,
+ .get_error_flags = rt4831_get_error_flags,
+};
+
+static const struct regulator_ops rt4831_dsvpn_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .get_error_flags = rt4831_get_error_flags,
+};
+
+static const struct regulator_desc rt4831_regulator_descs[] = {
+ {
+ .name = "DSVLCM",
+ .ops = &rt4831_dsvlcm_ops,
+ .of_match = of_match_ptr("DSVLCM"),
+ .regulators_node = of_match_ptr("regulators"),
+ .type = REGULATOR_VOLTAGE,
+ .id = DSV_OUT_VLCM,
+ .n_voltages = VLCM_N_VOLTAGES,
+ .min_uV = VLCM_MIN_UV,
+ .uV_step = STEP_UV,
+ .vsel_reg = RT4831_REG_VLCM,
+ .vsel_mask = RT4831_VOLT_MASK,
+ .bypass_reg = RT4831_REG_DSVEN,
+ .bypass_val_on = DSV_MODE_BYPASS,
+ .bypass_val_off = DSV_MODE_NORMAL,
+ },
+ {
+ .name = "DSVP",
+ .ops = &rt4831_dsvpn_ops,
+ .of_match = of_match_ptr("DSVP"),
+ .regulators_node = of_match_ptr("regulators"),
+ .type = REGULATOR_VOLTAGE,
+ .id = DSV_OUT_VPOS,
+ .n_voltages = VPN_N_VOLTAGES,
+ .min_uV = VPN_MIN_UV,
+ .uV_step = STEP_UV,
+ .vsel_reg = RT4831_REG_VPOS,
+ .vsel_mask = RT4831_VOLT_MASK,
+ .enable_reg = RT4831_REG_DSVEN,
+ .enable_mask = RT4831_POSEN_MASK,
+ .active_discharge_reg = RT4831_REG_DSVEN,
+ .active_discharge_mask = RT4831_POSADEN_MASK,
+ },
+ {
+ .name = "DSVN",
+ .ops = &rt4831_dsvpn_ops,
+ .of_match = of_match_ptr("DSVN"),
+ .regulators_node = of_match_ptr("regulators"),
+ .type = REGULATOR_VOLTAGE,
+ .id = DSV_OUT_VNEG,
+ .n_voltages = VPN_N_VOLTAGES,
+ .min_uV = VPN_MIN_UV,
+ .uV_step = STEP_UV,
+ .vsel_reg = RT4831_REG_VNEG,
+ .vsel_mask = RT4831_VOLT_MASK,
+ .enable_reg = RT4831_REG_DSVEN,
+ .enable_mask = RT4831_NEGEN_MASK,
+ .active_discharge_reg = RT4831_REG_DSVEN,
+ .active_discharge_mask = RT4831_NEGADEN_MASK,
+ }
+};
+
+static int rt4831_regulator_probe(struct platform_device *pdev)
+{
+ struct regmap *regmap;
+ struct regulator_dev *rdev;
+ struct regulator_config config = {};
+ int i, ret;
+
+ regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (IS_ERR(regmap)) {
+ dev_err(&pdev->dev, "Failed to init regmap\n");
+ return PTR_ERR(regmap);
+ }
+
+ /* Configure DSV mode to normal by default */
+ ret = regmap_update_bits(regmap, RT4831_REG_DSVEN, RT4831_DSVMODE_MASK, DSV_MODE_NORMAL);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to configure dsv mode to normal\n");
+ return ret;
+ }
+
+ config.dev = pdev->dev.parent;
+ config.regmap = regmap;
+
+ for (i = 0; i < DSV_OUT_MAX; i++) {
+ rdev = devm_regulator_register(&pdev->dev, rt4831_regulator_descs + i, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "Failed to register %d regulator\n", i);
+ return PTR_ERR(rdev);
+ }
+ }
+
+ return 0;
+}
+
+static const struct platform_device_id rt4831_regulator_match[] = {
+ { "rt4831-regulator", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(platform, rt4831_regulator_match);
+
+static struct platform_driver rt4831_regulator_driver = {
+ .driver = {
+ .name = "rt4831-regulator",
+ },
+ .id_table = rt4831_regulator_match,
+ .probe = rt4831_regulator_probe,
+};
+module_platform_driver(rt4831_regulator_driver);
+
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
+MODULE_LICENSE("GPL v2");
--
2.7.4