From: Keerthy <j-keerthy@xxxxxx> Add support for TPS6594X PMIC RTC. However, currently only get/set of time + date functionality is supported.. Signed-off-by: Keerthy <j-keerthy@xxxxxx> Signed-off-by: Matt Ranostay <mranostay@xxxxxx> --- drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-tps6594x.c | 181 +++++++++++++++++++++++++++++++++++++ 3 files changed, 192 insertions(+) create mode 100644 drivers/rtc/rtc-tps6594x.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index b8de25118ad0..df8e78eed5fb 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -593,6 +593,16 @@ config RTC_DRV_TPS65910 This driver can also be built as a module. If so, the module will be called rtc-tps65910. +config RTC_DRV_TPS6594X + tristate "TI TPS6594X RTC driver" + depends on MFD_TPS6594X + help + If you say yes here you get support for the RTC of TI TPS6594X series PMIC + chips. + + This driver can also be built as a module. If so, the module + will be called rtc-tps6594x. + config RTC_DRV_RC5T583 tristate "RICOH 5T583 RTC driver" depends on MFD_RC5T583 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index aab22bc63432..d854e162275a 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -177,6 +177,7 @@ obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o obj-$(CONFIG_RTC_DRV_TI_K3) += rtc-ti-k3.o obj-$(CONFIG_RTC_DRV_TPS6586X) += rtc-tps6586x.o obj-$(CONFIG_RTC_DRV_TPS65910) += rtc-tps65910.o +obj-$(CONFIG_RTC_DRV_TPS6594X) += rtc-tps6594x.o obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o obj-$(CONFIG_RTC_DRV_VT8500) += rtc-vt8500.o diff --git a/drivers/rtc/rtc-tps6594x.c b/drivers/rtc/rtc-tps6594x.c new file mode 100644 index 000000000000..e9f904d0a769 --- /dev/null +++ b/drivers/rtc/rtc-tps6594x.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * rtc-tps6594x.c -- TPS6594x Real Time Clock driver. + * + * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com + * + * TODO: alarm support + */ + +#include <linux/bcd.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/mfd/tps6594x.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/rtc.h> +#include <linux/types.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +struct tps6594x_rtc { + struct rtc_device *rtc; + struct device *dev; +}; + +#define TPS6594X_NUM_TIME_REGS (TPS6594X_RTC_YEARS - TPS6594X_RTC_SECONDS + 1) + +static int tps6594x_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + unsigned char rtc_data[TPS6594X_NUM_TIME_REGS]; + struct tps6594x *tps6594x = dev_get_drvdata(dev->parent); + int ret; + + /* Reset TPS6594X_RTC_CTRL_REG_GET_TIME bit to zero, required for latch */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_GET_TIME, 0); + if (ret < 0) { + dev_err(dev, "RTC CTRL reg update failed, err: %d\n", ret); + return ret; + } + + /* Copy RTC counting registers to static registers or latches */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_GET_TIME, TPS6594X_RTC_CTRL_REG_GET_TIME); + if (ret < 0) { + dev_err(dev, "RTC CTRL reg update failed, err: %d\n", ret); + return ret; + } + + ret = regmap_bulk_read(tps6594x->regmap, TPS6594X_RTC_SECONDS, + rtc_data, TPS6594X_NUM_TIME_REGS); + if (ret < 0) { + dev_err(dev, "RTC_SECONDS reg read failed, err = %d\n", ret); + return ret; + } + + tm->tm_sec = bcd2bin(rtc_data[0]); + tm->tm_min = bcd2bin(rtc_data[1]); + tm->tm_hour = bcd2bin(rtc_data[2]); + tm->tm_mday = bcd2bin(rtc_data[3]); + tm->tm_mon = bcd2bin(rtc_data[4]) - 1; + tm->tm_year = bcd2bin(rtc_data[5]) + 100; + + return ret; +} + +static int tps6594x_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + unsigned char rtc_data[TPS6594X_NUM_TIME_REGS]; + struct tps6594x *tps6594x = dev_get_drvdata(dev->parent); + int ret, retries = 5; + unsigned int val; + + rtc_data[0] = bin2bcd(tm->tm_sec); + rtc_data[1] = bin2bcd(tm->tm_min); + rtc_data[2] = bin2bcd(tm->tm_hour); + rtc_data[3] = bin2bcd(tm->tm_mday); + rtc_data[4] = bin2bcd(tm->tm_mon + 1); + rtc_data[5] = bin2bcd(tm->tm_year - 100); + + /* Stop RTC while updating the RTC time registers */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_STOP_RTC, 0); + if (ret < 0) { + dev_err(dev, "RTC stop failed, err = %d\n", ret); + return ret; + } + + /* Waiting till RTC isn't running */ + do { + ret = regmap_read(tps6594x->regmap, TPS6594X_RTC_STATUS, &val); + if (ret < 0) { + dev_err(dev, "RTC_STATUS reg read failed, err = %d\n", ret); + return ret; + } + msleep(20); + } while (--retries && (val & TPS6594X_RTC_STATUS_RUN)); + + if (!retries) { + dev_err(dev, "RTC_STATUS is still RUNNING\n"); + return -ETIMEDOUT; + } + + ret = regmap_bulk_write(tps6594x->regmap, TPS6594X_RTC_SECONDS, + rtc_data, TPS6594X_NUM_TIME_REGS); + if (ret < 0) { + dev_err(dev, "RTC_SECONDS reg write failed, err = %d\n", ret); + return ret; + } + + /* Start back RTC */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_STOP_RTC, + TPS6594X_RTC_CTRL_REG_STOP_RTC); + if (ret < 0) + dev_err(dev, "RTC start failed, err = %d\n", ret); + + return ret; +} + +static const struct rtc_class_ops tps6594x_rtc_ops = { + .read_time = tps6594x_rtc_read_time, + .set_time = tps6594x_rtc_set_time, +}; + +static int tps6594x_rtc_probe(struct platform_device *pdev) +{ + struct tps6594x *tps6594x = dev_get_drvdata(pdev->dev.parent); + struct tps6594x_rtc *tps6594x_rtc = NULL; + int ret; + + tps6594x_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps6594x_rtc), GFP_KERNEL); + if (!tps6594x_rtc) + return -ENOMEM; + + tps6594x_rtc->dev = &pdev->dev; + platform_set_drvdata(pdev, tps6594x_rtc); + + /* Start RTC */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_STOP_RTC, + TPS6594X_RTC_CTRL_REG_STOP_RTC); + if (ret < 0) { + dev_err(&pdev->dev, "RTC_CTRL write failed, err = %d\n", ret); + return ret; + } + + tps6594x_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, + &tps6594x_rtc_ops, THIS_MODULE); + if (IS_ERR(tps6594x_rtc->rtc)) { + ret = PTR_ERR(tps6594x_rtc->rtc); + dev_err(&pdev->dev, "RTC register failed, err = %d\n", ret); + return ret; + } + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id of_tps6594x_rtc_match[] = { + { .compatible = "ti,tps6594x-rtc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_tps6594x_rtc_match); +#endif + +static struct platform_driver tps6594x_rtc_driver = { + .probe = tps6594x_rtc_probe, + .driver = { + .name = "tps6594x-rtc", + .of_match_table = of_match_ptr(of_tps6594x_rtc_match), + }, +}; + +module_platform_driver(tps6594x_rtc_driver); + +MODULE_ALIAS("platform:tps6594x_rtc"); +MODULE_DESCRIPTION("TI TPS6594x series RTC driver"); +MODULE_AUTHOR("Keerthy J <j-keerthy@xxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.36.1
