From 8eb6960624e8f21ca814261d30899b26ecdccada Mon Sep 17 00:00:00 2001 From: Chaoyi Chen Date: Tue, 30 Jan 2024 16:11:49 +0800 Subject: [PATCH] drm/rockchip: ebc: Add silergy sy7636a regulator driver Change-Id: I76eea176a49d4a56e3f6a92c0aff5648ecbe5a4f Signed-off-by: Chaoyi Chen --- drivers/gpu/drm/rockchip/ebc-dev/Kconfig | 6 + .../gpu/drm/rockchip/ebc-dev/pmic/Makefile | 1 + .../drm/rockchip/ebc-dev/pmic/ebc_pmic_mfd.c | 10 + .../rockchip/ebc-dev/pmic/sy7636a-regulator.c | 256 ++++++++++++++++++ .../gpu/drm/rockchip/ebc-dev/pmic/sy7636a.h | 32 +++ 5 files changed, 305 insertions(+) create mode 100644 drivers/gpu/drm/rockchip/ebc-dev/pmic/sy7636a-regulator.c create mode 100644 drivers/gpu/drm/rockchip/ebc-dev/pmic/sy7636a.h diff --git a/drivers/gpu/drm/rockchip/ebc-dev/Kconfig b/drivers/gpu/drm/rockchip/ebc-dev/Kconfig index 663d4a3befe7..ece44e1832d5 100644 --- a/drivers/gpu/drm/rockchip/ebc-dev/Kconfig +++ b/drivers/gpu/drm/rockchip/ebc-dev/Kconfig @@ -9,3 +9,9 @@ config EPD_TPS65185_SENSOR bool "eink pmic Tps65185" depends on ROCKCHIP_EBC_DEV default y + +config EPD_SY7636A_PMIC + bool "EINK PMIC SY7636A Support" + depends on ROCKCHIP_EBC_DEV + help + If you say yes here you get support for the Silergy SY7636A PMIC. diff --git a/drivers/gpu/drm/rockchip/ebc-dev/pmic/Makefile b/drivers/gpu/drm/rockchip/ebc-dev/pmic/Makefile index 183c65dd26e0..5a555ccf2a93 100644 --- a/drivers/gpu/drm/rockchip/ebc-dev/pmic/Makefile +++ b/drivers/gpu/drm/rockchip/ebc-dev/pmic/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_ROCKCHIP_EBC_DEV) += ebc_pmic.o obj-$(CONFIG_EPD_TPS65185_SENSOR) += tps65185.o obj-$(CONFIG_ROCKCHIP_EBC_DEV) += ebc_pmic_mfd.o +obj-$(CONFIG_EPD_SY7636A_PMIC) += sy7636a-regulator.o diff --git a/drivers/gpu/drm/rockchip/ebc-dev/pmic/ebc_pmic_mfd.c b/drivers/gpu/drm/rockchip/ebc-dev/pmic/ebc_pmic_mfd.c index 79a28ce7932c..95ef8c550c31 100644 --- a/drivers/gpu/drm/rockchip/ebc-dev/pmic/ebc_pmic_mfd.c +++ b/drivers/gpu/drm/rockchip/ebc-dev/pmic/ebc_pmic_mfd.c @@ -62,7 +62,17 @@ static int pmic_mfd_i2c_probe(struct i2c_client *i2c) return 0; } +static const struct mfd_cell sy7636a_cells[] = { + { .name = "sy7636a-regulator", }, +}; + +static struct pmic_mfd_data silergy_sy7636a = { + .mfd_cell = sy7636a_cells, + .mfd_cell_size = ARRAY_SIZE(sy7636a_cells), +}; + static const struct of_device_id pmic_mfd_i2c_of_match[] = { + { .compatible = "silergy,sy7636a-pmic", .data = &silergy_sy7636a}, {} }; MODULE_DEVICE_TABLE(of, pmic_mfd_i2c_of_match); diff --git a/drivers/gpu/drm/rockchip/ebc-dev/pmic/sy7636a-regulator.c b/drivers/gpu/drm/rockchip/ebc-dev/pmic/sy7636a-regulator.c new file mode 100644 index 000000000000..ad2fedcec31d --- /dev/null +++ b/drivers/gpu/drm/rockchip/ebc-dev/pmic/sy7636a-regulator.c @@ -0,0 +1,256 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2024 Rockchip Electronics Co., Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "sy7636a.h" + +#define SY7636A_MAX_ENABLE_GPIO_NUM 4 + +struct sy7636a_data { + struct regmap *regmap; + struct gpio_descs *enable_gpio; + /* + * When registering a new regulator, regulator core will try to + * call "set_suspend_disable" to check whether regulator device + * working well. + * Just skip this suspend to avoid reconfiguring pinctrl. + */ + bool initial_suspend; + int vcom_uV; +}; + +static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev) +{ + int ret; + unsigned int val, val_h; + + ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); + if (ret) + return ret; + + ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); + if (ret) + return ret; + + val |= (val_h << VCOM_ADJUST_CTRL_SHIFT); + + return (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL; +} + +static int sy7636a_set_vcom_voltage_op(struct regulator_dev *rdev, int min_uV, int max_uV, + unsigned int *selector) +{ + struct sy7636a_data *data = rdev->reg_data; + int min_mV = DIV_ROUND_UP(min_uV, 1000); + int max_mV = max_uV / 1000; + u32 val; + int ret; + + if (max_mV < min_mV) + return -EINVAL; + + val = min_mV / 10; + + ret = regmap_write(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val & 0xFF); + if (ret) + return ret; + + ret = regmap_write(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, (val >> 1) & 0x80); + if (ret) + return ret; + + data->vcom_uV = min_uV; + + return 0; +} + +static int sy7636a_get_status(struct regulator_dev *rdev) +{ + return 0; +} + +static int sy7636a_set_suspend_disable(struct regulator_dev *rdev) +{ + DECLARE_BITMAP(values, SY7636A_MAX_ENABLE_GPIO_NUM); + struct sy7636a_data *data = rdev->reg_data; + int ret; + + bitmap_zero(values, SY7636A_MAX_ENABLE_GPIO_NUM); + + /* Skip initial suspend */ + if (data->initial_suspend) { + data->initial_suspend = false; + return 0; + } + + ret = regmap_write_bits(rdev->regmap, SY7636A_REG_OPERATION_MODE_CRL, + SY7636A_OPERATION_MODE_CRL_VCOMCTL, 0); + if (ret) + return ret; + + if (data->enable_gpio) { + ret = gpiod_set_array_value_cansleep(data->enable_gpio->ndescs, + data->enable_gpio->desc, + data->enable_gpio->info, values); + if (ret) + return ret; + } + + return 0; +} + +static int sy7636a_resume(struct regulator_dev *rdev) +{ + DECLARE_BITMAP(values, SY7636A_MAX_ENABLE_GPIO_NUM); + struct sy7636a_data *data = rdev->reg_data; + int ret, val; + + bitmap_fill(values, SY7636A_MAX_ENABLE_GPIO_NUM); + + if (data->enable_gpio) { + ret = gpiod_set_array_value_cansleep(data->enable_gpio->ndescs, + data->enable_gpio->desc, + data->enable_gpio->info, values); + if (ret) + return ret; + } + + /* After enable, sy7636a needs 2.5ms to enter active mode from sleep mode. */ + usleep_range(2500, 2600); + + /* VCOM setting resume */ + val = data->vcom_uV / VCOM_ADJUST_CTRL_SCAL; + + ret = regmap_write(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, val & 0xFF); + if (ret) + return ret; + + ret = regmap_write(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, (val >> 1) & 0x80); + if (ret) + return ret; + + ret = regmap_write(rdev->regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0); + if (ret) + return ret; + + ret = regmap_write_bits(rdev->regmap, SY7636A_REG_OPERATION_MODE_CRL, + SY7636A_OPERATION_MODE_CRL_VCOMCTL, 1); + if (ret) + return ret; + + return 0; +} + +static const struct regulator_ops sy7636a_vcom_volt_ops = { + .set_voltage = sy7636a_set_vcom_voltage_op, + .get_voltage = sy7636a_get_vcom_voltage_op, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .get_status = sy7636a_get_status, + .set_suspend_disable = sy7636a_set_suspend_disable, + .resume = sy7636a_resume, +}; + +static const struct regulator_desc desc = { + .name = "vcom", + .id = 0, + .ops = &sy7636a_vcom_volt_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .enable_reg = SY7636A_REG_OPERATION_MODE_CRL, + .enable_mask = SY7636A_OPERATION_MODE_CRL_ONOFF, + .regulators_node = of_match_ptr("regulators"), + .of_match = of_match_ptr("vcom"), +}; + +static int sy7636a_regulator_probe(struct platform_device *pdev) +{ + struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL); + struct regulator_config config = { }; + struct regulator_dev *rdev; + struct sy7636a_data *data; + int ret, val, val_h; + + if (!regmap) + return -EPROBE_DEFER; + + data = devm_kzalloc(&pdev->dev, sizeof(struct sy7636a_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = regmap; + data->initial_suspend = true; + + data->enable_gpio = devm_gpiod_get_array_optional(pdev->dev.parent, "enable", + GPIOD_OUT_HIGH); + if (IS_ERR(data->enable_gpio)) { + dev_err(pdev->dev.parent, "Failed to get sy7636a enable gpio %ld\n", + PTR_ERR(data->enable_gpio)); + return PTR_ERR(data->enable_gpio); + } + + /* sy7636a needs 2.5ms to enter active mode after enable */ + usleep_range(2500, 2600); + + ret = regmap_write(regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0); + if (ret) + goto fail; + + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); + if (ret) + goto fail; + + ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); + if (ret) + goto fail; + + val |= (val_h << VCOM_ADJUST_CTRL_SHIFT); + data->vcom_uV = (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL; + + platform_set_drvdata(pdev, data); + + config.dev = &pdev->dev; + config.dev->of_node = pdev->dev.parent->of_node; + config.regmap = regmap; + config.driver_data = data; + + rdev = devm_regulator_register(&pdev->dev, &desc, &config); + if (IS_ERR(rdev)) { + dev_err(pdev->dev.parent, "Failed to register %s regulator\n", pdev->name); + return PTR_ERR(rdev); + } + + return 0; + +fail: + dev_err(pdev->dev.parent, "Failed to initialize regulator: %d\n", ret); + return ret; +} + +static const struct platform_device_id sy7636a_regulator_id_table[] = { + { "sy7636a-regulator", }, + { } +}; +MODULE_DEVICE_TABLE(platform, sy7636a_regulator_id_table); + +static struct platform_driver sy7636a_regulator_driver = { + .driver = { + .name = "sy7636a-regulator", + }, + .probe = sy7636a_regulator_probe, + .id_table = sy7636a_regulator_id_table, +}; +module_platform_driver(sy7636a_regulator_driver); + +MODULE_DESCRIPTION("SY7636A voltage regulator driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpu/drm/rockchip/ebc-dev/pmic/sy7636a.h b/drivers/gpu/drm/rockchip/ebc-dev/pmic/sy7636a.h new file mode 100644 index 000000000000..ac3110135b93 --- /dev/null +++ b/drivers/gpu/drm/rockchip/ebc-dev/pmic/sy7636a.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2024 Rockchip Electronics Co., Ltd. + */ + +#ifndef SY7636A_H +#define SY7636A_H + +#define SY7636A_REG_OPERATION_MODE_CRL 0x00 +/* It is set if a gpio is used to control the regulator */ +#define SY7636A_OPERATION_MODE_CRL_VCOMCTL BIT(6) +#define SY7636A_OPERATION_MODE_CRL_ONOFF BIT(7) +#define SY7636A_REG_VCOM_ADJUST_CTRL_L 0x01 +#define SY7636A_REG_VCOM_ADJUST_CTRL_H 0x02 +#define SY7636A_REG_VCOM_ADJUST_CTRL_MASK 0x01ff +#define SY7636A_REG_VLDO_VOLTAGE_ADJULST_CTRL 0x03 +#define SY7636A_REG_POWER_ON_DELAY_TIME 0x06 +#define SY7636A_REG_FAULT_FLAG 0x07 +#define SY7636A_FAULT_FLAG_PG BIT(0) +#define SY7636A_REG_TERMISTOR_READOUT 0x08 + +#define SY7636A_REG_MAX 0x08 + +#define VCOM_ADJUST_CTRL_MASK 0x1ff +/* Used to shift the high byte */ +#define VCOM_ADJUST_CTRL_SHIFT 8 +/* Used to scale from VCOM_ADJUST_CTRL to mv */ +#define VCOM_ADJUST_CTRL_SCAL 10000 + +#define FAULT_FLAG_SHIFT 1 + +#endif /* SY7636A_H */