[PATCH v2 3/3] rtc: stm32: add stm32mp1 rtc support
kbuild test robot
lkp at intel.com
Thu May 10 04:40:09 PDT 2018
Hi Amelie,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on abelloni/rtc-next]
[also build test WARNING on next-20180510]
[cannot apply to v4.17-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Amelie-Delaunay/Introduce-STM32MP1-RTC/20180510-054013
base: https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
smatch warnings:
drivers/rtc/rtc-stm32.c:827 stm32_rtc_probe() warn: always true condition '(regs.verr != ~0) => (0-u16max != (-1))'
vim +827 drivers/rtc/rtc-stm32.c
694
695 static int stm32_rtc_probe(struct platform_device *pdev)
696 {
697 struct stm32_rtc *rtc;
698 struct stm32_rtc_registers regs;
699 struct resource *res;
700 int ret;
701
702 rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
703 if (!rtc)
704 return -ENOMEM;
705
706 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
707 rtc->base = devm_ioremap_resource(&pdev->dev, res);
708 if (IS_ERR(rtc->base))
709 return PTR_ERR(rtc->base);
710
711 rtc->data = (struct stm32_rtc_data *)
712 of_device_get_match_data(&pdev->dev);
713 regs = rtc->data->regs;
714
715 if (rtc->data->need_dbp) {
716 rtc->dbp = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
717 "st,syscfg");
718 if (IS_ERR(rtc->dbp)) {
719 dev_err(&pdev->dev, "no st,syscfg\n");
720 return PTR_ERR(rtc->dbp);
721 }
722
723 ret = of_property_read_u32_index(pdev->dev.of_node, "st,syscfg",
724 1, &rtc->dbp_reg);
725 if (ret) {
726 dev_err(&pdev->dev, "can't read DBP register offset\n");
727 return ret;
728 }
729
730 ret = of_property_read_u32_index(pdev->dev.of_node, "st,syscfg",
731 2, &rtc->dbp_mask);
732 if (ret) {
733 dev_err(&pdev->dev, "can't read DBP register mask\n");
734 return ret;
735 }
736 }
737
738 if (!rtc->data->has_pclk) {
739 rtc->pclk = NULL;
740 rtc->rtc_ck = devm_clk_get(&pdev->dev, NULL);
741 } else {
742 rtc->pclk = devm_clk_get(&pdev->dev, "pclk");
743 if (IS_ERR(rtc->pclk)) {
744 dev_err(&pdev->dev, "no pclk clock");
745 return PTR_ERR(rtc->pclk);
746 }
747 rtc->rtc_ck = devm_clk_get(&pdev->dev, "rtc_ck");
748 }
749 if (IS_ERR(rtc->rtc_ck)) {
750 dev_err(&pdev->dev, "no rtc_ck clock");
751 return PTR_ERR(rtc->rtc_ck);
752 }
753
754 if (rtc->data->has_pclk) {
755 ret = clk_prepare_enable(rtc->pclk);
756 if (ret)
757 return ret;
758 }
759
760 ret = clk_prepare_enable(rtc->rtc_ck);
761 if (ret)
762 goto err;
763
764 if (rtc->data->need_dbp)
765 regmap_update_bits(rtc->dbp, rtc->dbp_reg,
766 rtc->dbp_mask, rtc->dbp_mask);
767
768 /*
769 * After a system reset, RTC_ISR.INITS flag can be read to check if
770 * the calendar has been initialized or not. INITS flag is reset by a
771 * power-on reset (no vbat, no power-supply). It is not reset if
772 * rtc_ck parent clock has changed (so RTC prescalers need to be
773 * changed). That's why we cannot rely on this flag to know if RTC
774 * init has to be done.
775 */
776 ret = stm32_rtc_init(pdev, rtc);
777 if (ret)
778 goto err;
779
780 rtc->irq_alarm = platform_get_irq(pdev, 0);
781 if (rtc->irq_alarm <= 0) {
782 dev_err(&pdev->dev, "no alarm irq\n");
783 ret = rtc->irq_alarm;
784 goto err;
785 }
786
787 ret = device_init_wakeup(&pdev->dev, true);
788 if (rtc->data->has_wakeirq) {
789 rtc->wakeirq_alarm = platform_get_irq(pdev, 1);
790 if (rtc->wakeirq_alarm <= 0)
791 ret = rtc->wakeirq_alarm;
792 else
793 ret = dev_pm_set_dedicated_wake_irq(&pdev->dev,
794 rtc->wakeirq_alarm);
795 }
796 if (ret)
797 dev_warn(&pdev->dev, "alarm can't wake up the system: %d", ret);
798
799 platform_set_drvdata(pdev, rtc);
800
801 rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name,
802 &stm32_rtc_ops, THIS_MODULE);
803 if (IS_ERR(rtc->rtc_dev)) {
804 ret = PTR_ERR(rtc->rtc_dev);
805 dev_err(&pdev->dev, "rtc device registration failed, err=%d\n",
806 ret);
807 goto err;
808 }
809
810 /* Handle RTC alarm interrupts */
811 ret = devm_request_threaded_irq(&pdev->dev, rtc->irq_alarm, NULL,
812 stm32_rtc_alarm_irq, IRQF_ONESHOT,
813 pdev->name, rtc);
814 if (ret) {
815 dev_err(&pdev->dev, "IRQ%d (alarm interrupt) already claimed\n",
816 rtc->irq_alarm);
817 goto err;
818 }
819
820 /*
821 * If INITS flag is reset (calendar year field set to 0x00), calendar
822 * must be initialized
823 */
824 if (!(readl_relaxed(rtc->base + regs.isr) & STM32_RTC_ISR_INITS))
825 dev_warn(&pdev->dev, "Date/Time must be initialized\n");
826
> 827 if (regs.verr != UNDEF_REG) {
828 u32 ver = readl_relaxed(rtc->base + regs.verr);
829
830 dev_info(&pdev->dev, "registered rev:%d.%d\n",
831 (ver >> STM32_RTC_VERR_MAJREV_SHIFT) & 0xF,
832 (ver >> STM32_RTC_VERR_MINREV_SHIFT) & 0xF);
833 }
834
835 return 0;
836 err:
837 if (rtc->data->has_pclk)
838 clk_disable_unprepare(rtc->pclk);
839 clk_disable_unprepare(rtc->rtc_ck);
840
841 if (rtc->data->need_dbp)
842 regmap_update_bits(rtc->dbp, rtc->dbp_reg, rtc->dbp_mask, 0);
843
844 dev_pm_clear_wake_irq(&pdev->dev);
845 device_init_wakeup(&pdev->dev, false);
846
847 return ret;
848 }
849
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