From 3bcbaf6e08d8d82cde781997bd2c56dda87049b5 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Tue, 22 Feb 2011 21:07:46 +0100 Subject: rtc: cmos: Add OF bindings This allows to load the OF driver based informations from the device tree. Systems without BIOS may need to perform some initialization. PowerPC creates a PNP device from the OF information and performs this kind of initialization in their private PCI quirk. This looks more generic. This patch also avoids registering the platform RTC driver on X86 if we have a device tree blob. Otherwise we would setup the device based on the hardcoded information in arch/x86 rather than the device tree based one. [ tglx: Changed "int of_have_populated_dt()" to bool as recommended by Grant ] Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Dirk Brandewie Acked-by: Grant Likely Cc: sodaville@linutronix.de Cc: devicetree-discuss@lists.ozlabs.org Cc: rtc-linux@googlegroups.com Cc: Alessandro Zummo LKML-Reference: <1298405266-1624-12-git-send-email-bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner --- drivers/rtc/rtc-cmos.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index c7ff8df347e..159b95e4b42 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -37,6 +37,8 @@ #include #include #include +#include +#include /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */ #include @@ -1123,6 +1125,47 @@ static struct pnp_driver cmos_pnp_driver = { #endif /* CONFIG_PNP */ +#ifdef CONFIG_OF +static const struct of_device_id of_cmos_match[] = { + { + .compatible = "motorola,mc146818", + }, + { }, +}; +MODULE_DEVICE_TABLE(of, of_cmos_match); + +static __init void cmos_of_init(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct rtc_time time; + int ret; + const __be32 *val; + + if (!node) + return; + + val = of_get_property(node, "ctrl-reg", NULL); + if (val) + CMOS_WRITE(be32_to_cpup(val), RTC_CONTROL); + + val = of_get_property(node, "freq-reg", NULL); + if (val) + CMOS_WRITE(be32_to_cpup(val), RTC_FREQ_SELECT); + + get_rtc_time(&time); + ret = rtc_valid_tm(&time); + if (ret) { + struct rtc_time def_time = { + .tm_year = 1, + .tm_mday = 1, + }; + set_rtc_time(&def_time); + } +} +#else +static inline void cmos_of_init(struct platform_device *pdev) {} +#define of_cmos_match NULL +#endif /*----------------------------------------------------------------*/ /* Platform setup should have set up an RTC device, when PNP is @@ -1131,6 +1174,7 @@ static struct pnp_driver cmos_pnp_driver = { static int __init cmos_platform_probe(struct platform_device *pdev) { + cmos_of_init(pdev); cmos_wake_setup(&pdev->dev); return cmos_do_probe(&pdev->dev, platform_get_resource(pdev, IORESOURCE_IO, 0), @@ -1162,6 +1206,7 @@ static struct platform_driver cmos_platform_driver = { #ifdef CONFIG_PM .pm = &cmos_pm_ops, #endif + .of_match_table = of_cmos_match, } }; -- cgit v1.2.3