[5/9] rtc: Add Photonicat PMU real-time clock

Message ID	20240906093630.2428329-6-bigfoot@classfun.cn (mailing list archive)
State	Handled Elsewhere
Headers	show Received: from classfun.cn (unknown [129.204.178.38]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4851E1C9DFE; Fri, 6 Sep 2024 09:38:06 +0000 (UTC) sender: bigfoot) by classfun.cn (Postfix) with ESMTPSA id 0936078A03; Fri, 6 Sep 2024 17:38:03 +0800 (CST) From: Junhao Xie <bigfoot@classfun.cn> To: devicetree@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, linux-pm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Cc: Jean Delvare <jdelvare@suse.com>, Guenter Roeck <linux@roeck-us.net>, Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor Dooley <conor+dt@kernel.org>, Pavel Machek <pavel@ucw.cz>, Lee Jones <lee@kernel.org>, Sebastian Reichel <sre@kernel.org>, Alexandre Belloni <alexandre.belloni@bootlin.com>, Wim Van Sebroeck <wim@linux-watchdog.org>, Heiko Stuebner <heiko@sntech.de>, Chukun Pan <amadeus@jmu.edu.cn>, Junhao Xie <bigfoot@classfun.cn> Subject: [PATCH 5/9] rtc: Add Photonicat PMU real-time clock Date: Fri, 6 Sep 2024 17:36:26 +0800 Message-ID: <20240906093630.2428329-6-bigfoot@classfun.cn> In-Reply-To: <20240906093630.2428329-1-bigfoot@classfun.cn> References: <20240906093630.2428329-1-bigfoot@classfun.cn> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	Introduce Photonicat power management MCU driver \| expand [0/9] Introduce Photonicat power management MCU driver [1/9] mfd: Add driver for Photonicat power management MCU [2/9] power: reset: add Photonicat PMU poweroff driver [3/9] watchdog: Add Photonicat PMU watchdog driver [4/9] power: supply: photonicat-supply: Add Photonicat PMU battery and charger [5/9] rtc: Add Photonicat PMU real-time clock [6/9] hwmon: Add support for Photonicat PMU board temperature sensor [7/9] leds: add Photonicat PMU LED driver [8/9] dt-bindings: Add documentation for Photonicat PMU [9/9] arm64: dts: rockchip: add Photonicat PMU support for Ariaboard Photonicat

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 2a95b05982ad..3403ba3f5643 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -516,6 +516,18 @@ config RTC_DRV_PCF8583 This driver can also be built as a module. If so, the module will be called rtc-pcf8583. +config RTC_DRV_PHOTONICAT_PMU + tristate "Photonicat PMU RTC" + depends on MFD_PHOTONICAT_PMU + help + Photonicat PMU MCU will send status reports regularly, + including the MCU RTC date time. + + If you say yes here you get support for the Photonicat PMU RTC. + + This driver can also be built as a module. If so, the module + will be called rtc-photonicat. + config RTC_DRV_M41T80 tristate "ST M41T62/65/M41T80/81/82/83/84/85/87 and compatible" help diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 3004e372f25f..f050a134da1f 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -129,6 +129,7 @@ obj-$(CONFIG_RTC_DRV_PCF8523) += rtc-pcf8523.o obj-$(CONFIG_RTC_DRV_PCF85363) += rtc-pcf85363.o obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o +obj-$(CONFIG_RTC_DRV_PHOTONICAT_PMU) += rtc-photonicat.o obj-$(CONFIG_RTC_DRV_PIC32) += rtc-pic32.o obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030.o obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o diff --git a/drivers/rtc/rtc-photonicat.c b/drivers/rtc/rtc-photonicat.c new file mode 100644 index 000000000000..2e3115fb5c38 --- /dev/null +++ b/drivers/rtc/rtc-photonicat.c @@ -0,0 +1,190 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2024 Junhao Xie <bigfoot@classfun.cn> + */ + +#include <linux/kernel.h> +#include <linux/mfd/photonicat-pmu.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/rtc.h> + +struct pcat_data_cmd_startup { + struct pcat_data_cmd_date_time time; + union { + u8 value; + struct { + bool year : 1; + bool month : 1; + bool day : 1; + bool hour : 1; + bool minute : 1; + bool second : 1; + } __packed; + } match; +} __packed; + +struct pcat_rtc { + struct device *dev; + struct pcat_pmu *pmu; + struct notifier_block nb; + struct rtc_device *rtc; + struct pcat_data_cmd_date_time time; + struct completion initial_report; +}; + +static bool pcat_time_to_rtc_time(const struct pcat_data_cmd_date_time *time, + struct rtc_time *tm) +{ + if (time->second >= 60 || time->minute >= 60 || time->hour >= 24 || + time->day <= 0 || time->day > 31 || time->month <= 0 || + time->month > 12 || time->year < 1900 || time->year > 9999) + return false; + + tm->tm_sec = time->second; + tm->tm_min = time->minute; + tm->tm_hour = time->hour; + tm->tm_mday = time->day; + tm->tm_mon = time->month - 1; + tm->tm_year = time->year - 1900; + tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, time->year); + tm->tm_wday = ((time->year * (365 % 7)) + ((time->year - 1) / 4) - + ((time->year - 1) / 100) + ((time->year - 1) / 400) + + tm->tm_yday) % 7; + + return true; +} + +static void pcat_time_from_rtc_time(struct pcat_data_cmd_date_time *time, + const struct rtc_time *tm) +{ + time->year = tm->tm_year + 1900; + time->month = tm->tm_mon + 1; + time->day = tm->tm_mday; + time->hour = tm->tm_hour; + time->minute = tm->tm_min; + time->second = tm->tm_sec; +} + +static int pcat_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct pcat_rtc *rtc = dev_get_drvdata(dev); + + memset(tm, 0, sizeof(*tm)); + if (!pcat_time_to_rtc_time(&rtc->time, tm)) + return -EINVAL; + + return 0; +} + +static int pcat_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + int ret; + struct pcat_rtc *rtc = dev_get_drvdata(dev); + struct pcat_data_cmd_date_time time; + + pcat_time_from_rtc_time(&time, tm); + + ret = pcat_pmu_write_data(rtc->pmu, PCAT_CMD_DATE_TIME_SYNC, + &time, sizeof(time)); + if (ret) + return ret; + + memcpy(&rtc->time, &time, sizeof(rtc->time)); + + return 0; +} + +static const struct rtc_class_ops pcat_rtc_ops = { + .read_time = pcat_rtc_read_time, + .set_time = pcat_rtc_set_time, +}; + +static int pcat_rtc_notify(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct pcat_rtc *rtc = container_of(nb, struct pcat_rtc, nb); + struct pcat_data_cmd_status *status = pcat_data_get_data(data); + + if (action != PCAT_CMD_STATUS_REPORT) + return NOTIFY_DONE; + + memcpy(&rtc->time, &status->time, sizeof(rtc->time)); + complete(&rtc->initial_report); + + return NOTIFY_DONE; +} + +static int pcat_rtc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct pcat_rtc *rtc; + int ret; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc->dev = dev; + rtc->pmu = dev_get_drvdata(dev->parent); + rtc->nb.notifier_call = pcat_rtc_notify; + init_completion(&rtc->initial_report); + platform_set_drvdata(pdev, rtc); + + ret = pcat_pmu_register_notify(rtc->pmu, &rtc->nb); + if (ret) + return ret; + + if (!wait_for_completion_timeout(&rtc->initial_report, + msecs_to_jiffies(3000))) { + ret = dev_err_probe(dev, -ETIMEDOUT, + "timeout waiting for initial report\n"); + goto error; + } + + dev_info(dev, "RTC Time: %04d/%02d/%02d %02d:%02d:%02d\n", + rtc->time.year, rtc->time.month, rtc->time.day, rtc->time.hour, + rtc->time.minute, rtc->time.second); + + rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcat-rtc", + &pcat_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc->rtc)) { + ret = PTR_ERR(rtc->rtc); + dev_err_probe(&pdev->dev, ret, + "Failed to register RTC device\n"); + goto error; + } + + return 0; +error: + pcat_pmu_unregister_notify(rtc->pmu, &rtc->nb); + return ret; +} + +static void pcat_rtc_remove(struct platform_device *pdev) +{ + struct pcat_rtc *rtc = platform_get_drvdata(pdev); + + pcat_pmu_unregister_notify(rtc->pmu, &rtc->nb); +} + +static const struct of_device_id pcat_rtc_dt_ids[] = { + { .compatible = "ariaboard,photonicat-pmu-rtc", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, pcat_rtc_dt_ids); + +static struct platform_driver pcat_rtc_driver = { + .driver = { + .name = "rtc-photonicat", + .of_match_table = pcat_rtc_dt_ids, + }, + .probe = pcat_rtc_probe, + .remove = pcat_rtc_remove, +}; +module_platform_driver(pcat_rtc_driver); + +MODULE_AUTHOR("Junhao Xie <bigfoot@classfun.cn>"); +MODULE_DESCRIPTION("Photonicat PMU RTC"); +MODULE_LICENSE("GPL");

[5/9] rtc: Add Photonicat PMU real-time clock

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Patch