rtc: sophgo: add rtc support for Sophgo CV1800 SoC
Implement the RTC driver for CV1800, which able to provide time alarm. Signed-off-by: Jingbao Qiu <qiujingbao.dlmu@gmail.com> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> Link: https://lore.kernel.org/r/20250507195626.502240-1-alexander.sverdlin@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>pull/1257/head
Jingbao Qiu
Alexandre Belloni
parent
3639b35857
commit
d9f82683b1
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@ -1388,6 +1388,18 @@ config RTC_DRV_ASM9260
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This driver can also be built as a module. If so, the module
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will be called rtc-asm9260.
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config RTC_DRV_CV1800
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tristate "Sophgo CV1800 RTC"
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depends on SOPHGO_CV1800_RTCSYS || COMPILE_TEST
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select MFD_SYSCON
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select REGMAP
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help
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If you say yes here you get support the RTC driver for Sophgo CV1800
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series SoC.
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This driver can also be built as a module. If so, the module will be
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called rtc-cv1800.
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config RTC_DRV_DIGICOLOR
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tristate "Conexant Digicolor RTC"
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depends on ARCH_DIGICOLOR || COMPILE_TEST
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@ -44,6 +44,7 @@ obj-$(CONFIG_RTC_DRV_CADENCE) += rtc-cadence.o
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obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
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obj-$(CONFIG_RTC_DRV_CPCAP) += rtc-cpcap.o
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obj-$(CONFIG_RTC_DRV_CROS_EC) += rtc-cros-ec.o
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obj-$(CONFIG_RTC_DRV_CV1800) += rtc-cv1800.o
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obj-$(CONFIG_RTC_DRV_DA9052) += rtc-da9052.o
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obj-$(CONFIG_RTC_DRV_DA9055) += rtc-da9055.o
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obj-$(CONFIG_RTC_DRV_DA9063) += rtc-da9063.o
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@ -0,0 +1,218 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* rtc-cv1800.c: RTC driver for Sophgo cv1800 RTC
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*
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* Author: Jingbao Qiu <qiujingbao.dlmu@gmail.com>
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*/
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#include <linux/clk.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#define SEC_PULSE_GEN 0x1004
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#define ALARM_TIME 0x1008
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#define ALARM_ENABLE 0x100C
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#define SET_SEC_CNTR_VAL 0x1010
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#define SET_SEC_CNTR_TRIG 0x1014
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#define SEC_CNTR_VAL 0x1018
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/*
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* When in VDDBKUP domain, this MACRO register
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* does not power down
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*/
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#define MACRO_RO_T 0x14A8
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#define MACRO_RG_SET_T 0x1498
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#define ALARM_ENABLE_MASK BIT(0)
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#define SEL_SEC_PULSE BIT(31)
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struct cv1800_rtc_priv {
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struct rtc_device *rtc_dev;
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struct regmap *rtc_map;
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struct clk *clk;
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int irq;
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};
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static bool cv1800_rtc_enabled(struct device *dev)
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{
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struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
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u32 reg;
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regmap_read(info->rtc_map, SEC_PULSE_GEN, ®);
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return (reg & SEL_SEC_PULSE) == 0;
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}
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static void cv1800_rtc_enable(struct device *dev)
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{
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struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
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/* Sec pulse generated internally */
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regmap_update_bits(info->rtc_map, SEC_PULSE_GEN, SEL_SEC_PULSE, 0);
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}
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static int cv1800_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
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regmap_write(info->rtc_map, ALARM_ENABLE, enabled);
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return 0;
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}
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static int cv1800_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
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unsigned long alarm_time;
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alarm_time = rtc_tm_to_time64(&alrm->time);
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cv1800_rtc_alarm_irq_enable(dev, 0);
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regmap_write(info->rtc_map, ALARM_TIME, alarm_time);
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cv1800_rtc_alarm_irq_enable(dev, alrm->enabled);
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return 0;
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}
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static int cv1800_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
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u32 enabled;
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u32 time;
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if (!cv1800_rtc_enabled(dev)) {
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alarm->enabled = 0;
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return 0;
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}
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regmap_read(info->rtc_map, ALARM_ENABLE, &enabled);
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alarm->enabled = enabled & ALARM_ENABLE_MASK;
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regmap_read(info->rtc_map, ALARM_TIME, &time);
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rtc_time64_to_tm(time, &alarm->time);
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return 0;
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}
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static int cv1800_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
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u32 sec;
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if (!cv1800_rtc_enabled(dev))
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return -EINVAL;
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regmap_read(info->rtc_map, SEC_CNTR_VAL, &sec);
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rtc_time64_to_tm(sec, tm);
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return 0;
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}
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static int cv1800_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
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unsigned long sec;
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sec = rtc_tm_to_time64(tm);
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regmap_write(info->rtc_map, SET_SEC_CNTR_VAL, sec);
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regmap_write(info->rtc_map, SET_SEC_CNTR_TRIG, 1);
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regmap_write(info->rtc_map, MACRO_RG_SET_T, sec);
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cv1800_rtc_enable(dev);
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return 0;
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}
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static irqreturn_t cv1800_rtc_irq_handler(int irq, void *dev_id)
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{
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struct cv1800_rtc_priv *info = dev_id;
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rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
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regmap_write(info->rtc_map, ALARM_ENABLE, 0);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops cv1800_rtc_ops = {
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.read_time = cv1800_rtc_read_time,
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.set_time = cv1800_rtc_set_time,
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.read_alarm = cv1800_rtc_read_alarm,
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.set_alarm = cv1800_rtc_set_alarm,
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.alarm_irq_enable = cv1800_rtc_alarm_irq_enable,
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};
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static int cv1800_rtc_probe(struct platform_device *pdev)
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{
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struct cv1800_rtc_priv *rtc;
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int ret;
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rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
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if (!rtc)
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return -ENOMEM;
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rtc->rtc_map = device_node_to_regmap(pdev->dev.parent->of_node);
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if (IS_ERR(rtc->rtc_map))
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return dev_err_probe(&pdev->dev, PTR_ERR(rtc->rtc_map),
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"cannot get parent regmap\n");
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rtc->irq = platform_get_irq(pdev, 0);
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if (rtc->irq < 0)
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return rtc->irq;
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rtc->clk = devm_clk_get_enabled(pdev->dev.parent, "rtc");
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if (IS_ERR(rtc->clk))
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return dev_err_probe(&pdev->dev, PTR_ERR(rtc->clk),
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"rtc clk not found\n");
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platform_set_drvdata(pdev, rtc);
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device_init_wakeup(&pdev->dev, 1);
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rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(rtc->rtc_dev))
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return PTR_ERR(rtc->rtc_dev);
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rtc->rtc_dev->ops = &cv1800_rtc_ops;
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rtc->rtc_dev->range_max = U32_MAX;
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ret = devm_request_irq(&pdev->dev, rtc->irq, cv1800_rtc_irq_handler,
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IRQF_TRIGGER_HIGH, "rtc alarm", rtc);
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if (ret)
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return dev_err_probe(&pdev->dev, ret,
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"cannot register interrupt handler\n");
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return devm_rtc_register_device(rtc->rtc_dev);
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}
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static const struct platform_device_id cv1800_rtc_id[] = {
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{ .name = "cv1800b-rtc" },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(platform, cv1800_rtc_id);
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static struct platform_driver cv1800_rtc_driver = {
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.driver = {
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.name = "sophgo-cv1800-rtc",
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},
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.probe = cv1800_rtc_probe,
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.id_table = cv1800_rtc_id,
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};
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module_platform_driver(cv1800_rtc_driver);
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MODULE_AUTHOR("Jingbao Qiu");
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MODULE_DESCRIPTION("Sophgo cv1800 RTC Driver");
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MODULE_LICENSE("GPL");
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