From: Keerthy <j-keerthy@xxxxxx> Add support for TPS6594 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-tps6594.c | 155 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 166 insertions(+) create mode 100644 drivers/rtc/rtc-tps6594.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index ab9a1f814119..519dc544b083 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -588,6 +588,16 @@ 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_TPS6594 + tristate "TI TPS6594 RTC driver" + depends on MFD_TPS6594 || COMPILE_TEST + help + If you say yes here you get support for the RTC of TI TPS6594 series PMIC + chips. + + This driver can also be built as a module. If so, the module + will be called rtc-tps6594. + config RTC_DRV_RC5T583 tristate "RICOH 5T583 RTC driver" depends on MFD_RC5T583 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index d3c042dcbc73..4493a13f989d 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -175,6 +175,7 @@ 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-$(CONFIG_RTC_DRV_TPS6594) += rtc-tps6594.o obj-$(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-tps6594.c b/drivers/rtc/rtc-tps6594.c new file mode 100644 index 000000000000..6e85ea8551a2 --- /dev/null +++ b/drivers/rtc/rtc-tps6594.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * rtc-tps6594.c -- TPS6594 Real Time Clock driver. + * + * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com + */ + +#include <linux/bcd.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/mfd/tps6594.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 tps6594_rtc { + struct rtc_device *rtc; + struct device *dev; +}; + +#define TPS6594_RTC_POLL 20000 +#define TPS6594_RTC_TIMEOUT 100000 + +#define TPS6594_NUM_TIME_REGS (TPS6594_RTC_YEARS - TPS6594_RTC_SECONDS + 1) + +static int tps6594_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + unsigned char rtc_data[TPS6594_NUM_TIME_REGS]; + struct tps6594 *tps6594 = dev_get_drvdata(dev->parent); + int ret; + + /* Reset TPS6594_RTC_CTRL_REG_GET_TIME bit to zero, required for latch */ + ret = regmap_update_bits(tps6594->regmap, TPS6594_RTC_CTRL_1, + TPS6594_RTC_CTRL_REG_GET_TIME, 0); + if (ret < 0) + return ret; + + /* Copy RTC counting registers to static registers or latches */ + ret = regmap_update_bits(tps6594->regmap, TPS6594_RTC_CTRL_1, + TPS6594_RTC_CTRL_REG_GET_TIME, TPS6594_RTC_CTRL_REG_GET_TIME); + if (ret < 0) + return ret; + + ret = regmap_bulk_read(tps6594->regmap, TPS6594_RTC_SECONDS, + rtc_data, TPS6594_NUM_TIME_REGS); + if (ret < 0) + 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 tps6594_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + unsigned char rtc_data[TPS6594_NUM_TIME_REGS]; + struct tps6594 *tps6594 = dev_get_drvdata(dev->parent); + unsigned int val; + int ret; + + 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(tps6594->regmap, TPS6594_RTC_CTRL_1, + TPS6594_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 */ + ret = regmap_read_poll_timeout(tps6594->regmap, TPS6594_RTC_STATUS, + val, !(val & TPS6594_RTC_STATUS_RUN), + TPS6594_RTC_POLL, TPS6594_RTC_TIMEOUT); + if (ret) { + dev_err(dev, "RTC_STATUS is still RUNNING\n"); + return ret; + } + + ret = regmap_bulk_write(tps6594->regmap, TPS6594_RTC_SECONDS, + rtc_data, TPS6594_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(tps6594->regmap, TPS6594_RTC_CTRL_1, + TPS6594_RTC_CTRL_REG_STOP_RTC, + TPS6594_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 tps6594_rtc_ops = { + .read_time = tps6594_rtc_read_time, + .set_time = tps6594_rtc_set_time, +}; + +static int tps6594_rtc_probe(struct platform_device *pdev) +{ + struct tps6594_rtc *tps6594_rtc; + + tps6594_rtc = devm_kzalloc(&pdev->dev, sizeof(*tps6594_rtc), GFP_KERNEL); + if (!tps6594_rtc) + return -ENOMEM; + + tps6594_rtc->dev = &pdev->dev; + platform_set_drvdata(pdev, tps6594_rtc); + + tps6594_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(tps6594_rtc->rtc)) + return PTR_ERR(tps6594_rtc->rtc); + + tps6594_rtc->rtc->ops = &tps6594_rtc_ops; + + return devm_rtc_register_device(tps6594_rtc->rtc); +} + +static const struct of_device_id of_tps6594_rtc_match[] = { + { .compatible = "ti,tps6594-rtc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_tps6594_rtc_match); + +static struct platform_driver tps6594_rtc_driver = { + .probe = tps6594_rtc_probe, + .driver = { + .name = "tps6594-rtc", + .of_match_table = of_tps6594_rtc_match, + }, +}; + +module_platform_driver(tps6594_rtc_driver); + +MODULE_ALIAS("platform:tps6594-rtc"); +MODULE_DESCRIPTION("TI TPS6594 series RTC driver"); +MODULE_AUTHOR("Keerthy J <j-keerthy@xxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.38.GIT
